ci: add opt-in Stage web diagnostics

Use a deterministic headless frame clock and check the actual 2D and 3D rotation. Create a guarded fresh project with the installed CLI even when preceding tests failed.

.gitattributes

@@ -0,0 +1,5 @@
+# Golden files and project sources are byte-stable across platforms.
+* text=auto eol=lf
+
+# Preserve the upstream font license exactly as committed (it uses CRLF).
+tools/gendocs/site/static/fonts/IBM-Plex-OFL.txt -text

.github/README.md

@@ -1,3 +1,41 @@
 # CI workflows
 
-The workflows in this directory automate checks, builds, tests, and release publishing for Aego. Optional platform-runner jobs cover Windows and macOS alongside the main Linux checks.
+Gitea is the source of truth. The Linux workflow runs there; optional Gitea
+platform runners remain controlled by `PLATFORM_RUNNERS`.
+
+`github-native.yml` is for the GitHub mirror. It builds and tests on native
+Windows, macOS (arm64 and amd64), and Linux runners, and uploads unsigned CI
+artifacts and diagnostic logs. The Windows installer smoke is restricted to an
+ephemeral GitHub-hosted runner. macOS bundles are ad-hoc signed, not notarized.
+These jobs are not evidence of platform support until they actually pass on
+their respective runners.
+
+On Gitea, the GitHub-only matrix routes to the Linux runner before being
+skipped. This prevents Windows and macOS entries from waiting indefinitely for
+runners that Gitea does not have. On GitHub, the actual native labels are used.
+macOS and Windows build the pinned GLSL reference validator from verified
+source, rather than depending on a changing package-manager version.
+
+To show native GitHub results on the Gitea commit, create the GitHub Actions
+secret `GITEA_STATUS_TOKEN` containing a Gitea API token with repository write
+permission. Prefer a non-admin bot that has access only to `sanspie/aego`:
+Gitea's repository-write token is broader than commit statuses. The reporter
+publishes pending and final statuses with links to the real GitHub jobs only
+for trusted `master` pushes or manual runs, never for pull requests. If the
+secret is missing, CI still runs but no Gitea statuses are published.
+
+Keep GitHub Actions disabled through the first mirror sync: historical tags
+can contain older workflows. Before enabling Actions, verify mirrored refs and
+restrict the allowed workflows so historical release jobs cannot run. Use a
+separate repository-scoped credential for the mirror; do not put it in a URL.
+Gitea's build-and-publish job remains paused. `github-release-mirror.yml`
+copies already-published Gitea releases and assets to GitHub after the current
+master passes Gitea Linux CI and all four real GitHub native jobs. It also
+checks periodically and can be dispatched manually from master. Versioned
+stable releases are published normally, with the highest stable version marked
+Latest; nightly, beta versions, and the stable-channel pointer are prereleases.
+The mirror verifies matching git refs and asset sizes/checksums, stages new
+releases as drafts, and never moves tags or replaces existing assets. If a
+mutable nightly or another mirrored snapshot changes, the mirror stops rather
+than overwriting it; a separate reviewed update is needed in that case. Signed
+update manifests are copied unchanged and retain their original download URLs.

.github/workflows/ci-platforms.yml

@@ -21,7 +21,7 @@ jobs:
   # Native runs on Windows and macOS machines; the Windows build itself is cross-compiled on Linux in ci.yml (D301).
   smoke:
     name: ${{ matrix.goos }} ${{ matrix.goarch }} smoke
-    if: vars.PLATFORM_RUNNERS == 'true'
+    if: github.server_url != 'https://github.com' && vars.PLATFORM_RUNNERS == 'true'
     strategy:
       fail-fast: false
       matrix:

.github/workflows/ci.yml

@@ -20,6 +20,7 @@ env:
 
 jobs:
   checks:
+    if: github.server_url != 'https://github.com'
     runs-on: ubuntu-24.04
     steps:
       - uses: actions/checkout@v4
@@ -44,6 +45,7 @@ jobs:
         run: make nsis-check
 
   build:
+    if: github.server_url != 'https://github.com'
     strategy:
       fail-fast: false
       matrix:
@@ -121,7 +123,9 @@ jobs:
 
   release:
     needs: [checks, build]
-    if: github.event_name == 'push'
+    # Pause all automatic releases until the reviewed nightly/stable pipeline
+    # enforces native gates and preserves existing tags and release assets.
+    if: ${{ false }}
     runs-on: ubuntu-24.04
     permissions:
       contents: write

.github/workflows/github-release-mirror.yml

@@ -0,0 +1,37 @@
+name: github-release-mirror
+
+on:
+  workflow_run:
+    workflows: [github-native]
+    types: [completed]
+    branches: [master]
+  schedule:
+    - cron: '17 */6 * * *'
+  workflow_dispatch:
+
+permissions:
+  contents: read
+
+concurrency:
+  group: github-release-mirror
+  cancel-in-progress: false
+
+jobs:
+  mirror:
+    if: github.server_url == 'https://github.com' && github.repository == 'Alexander-D-Karpov/aego' && github.ref == 'refs/heads/master'
+    runs-on: ubuntu-24.04
+    timeout-minutes: 60
+    permissions:
+      contents: write
+      actions: read
+    steps:
+      - uses: actions/checkout@11d5960a326750d5838078e36cf38b85af677262 # v4
+        with:
+          ref: refs/heads/master
+          persist-credentials: false
+      - name: Test release mirror
+        run: python3 -m unittest discover -s tools/ci -p mirror_releases_test.py -v
+      - name: Mirror published Gitea releases
+        env:
+          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        run: python3 tools/ci/mirror_releases.py --apply

app/bootstrap/key_test.go

@@ -1,6 +1,7 @@
 package bootstrap
 
 import (
+	"fmt"
 	"os"
 	"path/filepath"
 	"testing"
@@ -98,7 +99,8 @@ func TestKeyTracksNativeSources(t *testing.T) {
 
 func TestLocalReplaces(t *testing.T) {
 	root := t.TempDir()
-	writeFile(t, filepath.Join(root, "go.mod"), `module game
+	absolute := filepath.VolumeName(root) + "/abs/c"
+	writeFile(t, filepath.Join(root, "go.mod"), fmt.Sprintf(`module game
 
 go 1.27
 
@@ -107,9 +109,9 @@ replace aego => ../engine // local engine
 replace (
     example.com/a v1.2.3 => ./vendor/a
     example.com/b => example.com/b v1.0.0
-    example.com/c => /abs/c
+    example.com/c => %s
 )
-`)
+`, absolute))
 	got, err := LocalReplaces(root)
 	if err != nil {
 		t.Fatal(err)
@@ -117,7 +119,7 @@ replace (
 	want := map[string]bool{
 		filepath.Clean(filepath.Join(root, "../engine")):   true,
 		filepath.Clean(filepath.Join(root, "vendor", "a")): true,
-		filepath.Clean("/abs/c"):                           true,
+		filepath.Clean(absolute):                           true,
 	}
 	if len(got) != len(want) {
 		t.Fatalf("replaces = %v", got)

app/crash/crash.go

@@ -78,11 +78,21 @@ type Bundle struct {
 func sanitizer() func(string) string {
 	home, _ := os.UserHomeDir()
 	return func(s string) string {
-		if home != "" {
+		return hideHome(s, home)
-			s = strings.ReplaceAll(s, home, "~")
+	}
-		}
+}
+
+func hideHome(s, home string) string {
+	if home == "" {
 		return s
 	}
+	// Windows paths can appear with either separator in stack traces and logs.
+	for _, prefix := range [2]string{home, strings.ReplaceAll(home, `\`, "/")} {
+		s = strings.ReplaceAll(s, prefix+`\`, "~/")
+		s = strings.ReplaceAll(s, prefix+"/", "~/")
+		s = strings.ReplaceAll(s, prefix, "~")
+	}
+	return s
 }
 
 func Write(b Bundle) (string, error) {

app/crash/crash_test.go

@@ -3,6 +3,7 @@ package crash
 import (
 	"os"
 	"path/filepath"
+	"runtime"
 	"strings"
 	"testing"
 )
@@ -10,6 +11,9 @@ import (
 func TestBundleHidesHome(t *testing.T) {
 	home := t.TempDir()
 	t.Setenv("HOME", home)
+	if runtime.GOOS == "windows" {
+		t.Setenv("USERPROFILE", home)
+	}
 	root := filepath.Join(home, "game")
 	dir, err := Write(Bundle{Root: root, Kind: "panic", Where: "panel inspector", Panic: "boom in " + root, Stack: []byte(root + "/x.go:1")})
 	if err != nil {
@@ -25,3 +29,12 @@ func TestBundleHidesHome(t *testing.T) {
 		}
 	}
 }
+
+func TestHideHomeWithWindowsSeparators(t *testing.T) {
+	home := `C:\Users\Alice`
+	for _, input := range []string{`C:\Users\Alice\game\main.go`, `C:/Users/Alice/game/main.go`} {
+		if got := hideHome(input, home); got != `~/game/main.go` && got != `~/game\main.go` {
+			t.Fatalf("hideHome(%q) = %q", input, got)
+		}
+	}
+}

app/edit/lighting_workflow_gl_test.go

@@ -3,6 +3,7 @@
 package edit
 
 import (
+	"bytes"
 	"runtime"
 	"testing"
 
@@ -11,10 +12,81 @@ import (
 	"aego/core/mathx"
 	"aego/editor/core/workspace"
 	"aego/modules/render2d"
+	render2deditor "aego/modules/render2d/editor"
 	"aego/scene"
 	"aego/scene/frame"
 )
 
+// The toolbar must leave the debug image, not just clear its checked state.
+func TestSceneViewLightingToggleClearsDebugPixels(t *testing.T) {
+	runtime.LockOSThread()
+	defer runtime.UnlockOSThread()
+	p := newProject(t)
+	const path = "scenes/debug-toggle.aescene"
+	writeScene(t, p, path, func(s *scene.Scene) {
+		h := s.Create(s.Root(), "Red")
+		sr := scene.Add[render2d.SpriteRenderer](s, h)
+		*sr = render2d.DefaultSpriteRenderer()
+		sr.Sprite = asset.NewRef[asset.Texture](asset.BuiltinWhite)
+		sr.Material = asset.NewRef[asset.Material](asset.BuiltinMaterialLit)
+		sr.Tint = mathx.Color{R: 1, A: 1}
+		sr.Size = mathx.V2(4, 4)
+	})
+	s, err := Open(p, Config{Width: 800, Height: 600, Hidden: true, NoWatch: true, Logger: log.Nop()})
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer s.Close()
+	s.Step()
+	ed := s.App.Context()
+	doc, err := ed.Docs.Open(path)
+	if err != nil {
+		t.Fatal(err)
+	}
+	doc.View.Camera.Position = mathx.Vec2{}
+	s.App.SceneView().SetZoom(40)
+	ed.Settings.Grid = false
+	for range 3 {
+		s.Step()
+	}
+	panel := s.App.SceneView()
+	raw, ok := panel.LightingWorld().ServiceAny(frame.ServiceID)
+	if !ok {
+		t.Fatal("missing Scene View runner")
+	}
+	runner := raw.(*frame.Runner)
+	read := func() []byte {
+		t.Helper()
+		for range 2 {
+			s.Step()
+		}
+		target, w, h := runner.Target()
+		pixels := make([]byte, w*h*4)
+		if target.IsZero() || ed.Renderer.Device().ReadPixels(target, 0, 0, w, h, pixels) != nil {
+			t.Fatal("cannot read the Scene View")
+		}
+		return pixels
+	}
+	press := func(id string) {
+		t.Helper()
+		if err := ed.Commands.Run(id); err != nil {
+			t.Fatal(err)
+		}
+	}
+	press(render2deditor.CmdLighting)
+	unlit := read()
+	for _, debug := range []string{render2deditor.CmdLightingNormals, render2deditor.CmdLightingShadows} {
+		press(debug)
+		if bytes.Equal(unlit, read()) {
+			t.Fatalf("%s did not change the rendered image", debug)
+		}
+		press(render2deditor.CmdLighting)
+		if off := read(); !bytes.Equal(unlit, off) {
+			t.Fatalf("turning off lighting left %s in the rendered image", debug)
+		}
+	}
+}
+
 func TestLightingAuthoringWorkflowNative(t *testing.T) {
 	runtime.LockOSThread()
 	defer runtime.UnlockOSThread()

app/edit/sceneview_2d_in_3d_gl_test.go

@@ -0,0 +1,84 @@
+//go:build aego_gltest
+
+package edit
+
+import (
+	"runtime"
+	"testing"
+
+	"aego/asset"
+	"aego/core/log"
+	"aego/core/mathx"
+	"aego/editor/core/document"
+	"aego/modules/render2d"
+	"aego/scene"
+	"aego/scene/frame"
+)
+
+func TestSceneView3DShows2DSpritePixels(t *testing.T) {
+	runtime.LockOSThread()
+	defer runtime.UnlockOSThread()
+	p := newProject(t)
+	const path = "scenes/2d-in-3d.aescene"
+	writeScene(t, p, path, func(s *scene.Scene) {
+		h := s.Create(s.Root(), "Red sprite")
+		sr := scene.Add[render2d.SpriteRenderer](s, h)
+		*sr = render2d.DefaultSpriteRenderer()
+		sr.Sprite = asset.NewRef[asset.Texture](asset.BuiltinWhite)
+		sr.Tint = mathx.Color{R: 1, A: 1}
+		sr.Size = mathx.V2(4, 4)
+	})
+	s, err := Open(p, Config{Width: 800, Height: 600, Hidden: true, NoWatch: true, Logger: log.Nop()})
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer s.Close()
+	s.Step()
+	ed := s.App.Context()
+	doc, err := ed.Docs.Open(path)
+	if err != nil {
+		t.Fatal(err)
+	}
+	doc.View.Mode = document.View3D
+	doc.View.Orbit = document.Orbit{Distance: 10, FOV: 60}
+	ed.Settings.Grid = false
+	for range 3 {
+		s.Step()
+	}
+	raw, ok := s.App.SceneView().LightingWorld().ServiceAny(frame.ServiceID)
+	if !ok {
+		t.Fatal("missing Scene View runner")
+	}
+	runner := raw.(*frame.Runner)
+	readRed := func() int {
+		t.Helper()
+		for range 2 {
+			s.Step()
+		}
+		target, w, h := runner.Target()
+		pixels := make([]byte, w*h*4)
+		if target.IsZero() {
+			t.Fatal("no Scene View target")
+		}
+		if err := ed.Renderer.Device().ReadPixels(target, 0, 0, w, h, pixels); err != nil {
+			t.Fatal(err)
+		}
+		count := 0
+		for i := 0; i+3 < len(pixels); i += 4 {
+			if pixels[i] > 160 && pixels[i+1] < 80 && pixels[i+2] < 80 {
+				count++
+			}
+		}
+		return count
+	}
+	visible := readRed()
+	if visible < 100 {
+		t.Fatalf("2D sprite produced only %d red pixels in 3D Scene View", visible)
+	}
+	sc := doc.Scene()
+	h := sc.Find(sc.Root(), "Red sprite")
+	sc.SetEnabled(h, false)
+	if hidden := readRed(); hidden >= visible/2 {
+		t.Fatalf("disabling the sprite left %d of %d red pixels", hidden, visible)
+	}
+}

app/export/seal.go

@@ -43,18 +43,31 @@ func walkExport(dir string, dst *os.Root) ([32]byte, error) {
 	if err != nil {
 		return sum, err
 	}
+	info, err := os.Lstat(clean)
+	if err != nil {
+		return sum, err
+	}
+	if !info.IsDir() || info.Mode()&os.ModeSymlink != 0 {
+		return sum, errors.New("export directory was replaced by a symlink or is not a directory")
+	}
+	// System paths such as /var on macOS may have symlinked ancestors. Resolve
+	// them, but pin the final directory and still refuse links inside the export.
 	actual, err := filepath.EvalSymlinks(clean)
 	if err != nil {
 		return sum, err
 	}
-	if actual != clean {
+	root, err := os.OpenRoot(actual)
-		return sum, errors.New("export directory was replaced by a symlink")
-	}
-	root, err := os.OpenRoot(clean)
 	if err != nil {
 		return sum, err
 	}
 	defer root.Close()
+	opened, err := root.Stat(".")
+	if err != nil {
+		return sum, err
+	}
+	if !os.SameFile(info, opened) {
+		return sum, errors.New("export directory changed during verification")
+	}
 	const maxFiles = 32768
 	const maxBytes = 1 << 30
 	var count int

app/export/seal_test.go

@@ -59,3 +59,53 @@ func TestExportSealRefusesChildLink(t *testing.T) {
 		t.Fatal("symlink into another tree was sealed")
 	}
 }
+
+func TestExportSealSymlinkedAncestorAndRoot(t *testing.T) {
+	if runtime.GOOS == "windows" {
+		t.Skip("unprivileged symlinks are not available by default on Windows")
+	}
+	dir := t.TempDir()
+	parent := filepath.Join(dir, "real")
+	other := filepath.Join(dir, "other")
+	for _, p := range []string{parent, other} {
+		if err := os.MkdirAll(filepath.Join(p, "export"), 0700); err != nil {
+			t.Fatal(err)
+		}
+	}
+	if err := os.WriteFile(filepath.Join(parent, "export", "game"), []byte("good"), 0700); err != nil {
+		t.Fatal(err)
+	}
+	if err := os.WriteFile(filepath.Join(other, "export", "game"), []byte("evil"), 0700); err != nil {
+		t.Fatal(err)
+	}
+	alias := filepath.Join(dir, "alias")
+	if err := os.Symlink(parent, alias); err != nil {
+		t.Fatal(err)
+	}
+	path := filepath.Join(alias, "export")
+	seal, err := Seal(path)
+	if err != nil {
+		t.Fatalf("symlinked ancestor: %v", err)
+	}
+	copy, err := VerifiedCopy(path, seal)
+	if err != nil {
+		t.Fatal(err)
+	}
+	t.Cleanup(func() { os.RemoveAll(copy) })
+	if err := os.Remove(alias); err != nil {
+		t.Fatal(err)
+	}
+	if err := os.Symlink(other, alias); err != nil {
+		t.Fatal(err)
+	}
+	if _, err := VerifiedCopy(path, seal); err == nil {
+		t.Fatal("a changed ancestor redirected the sealed export")
+	}
+	rootLink := filepath.Join(dir, "export-link")
+	if err := os.Symlink(filepath.Join(parent, "export"), rootLink); err != nil {
+		t.Fatal(err)
+	}
+	if _, err := Seal(rootLink); err == nil {
+		t.Fatal("a symlink used as the export directory was sealed")
+	}
+}

app/meta.go

@@ -50,8 +50,7 @@ func ShaderProblems(imps *pipeline.ImporterRegistry) problems.Source {
 			if si == nil {
 				return 0
 			}
-			_, rev := si.Diagnostics()
+			return si.Revision()
-			return rev
 		},
 		Append: func(dst []problems.Diagnostic) []problems.Diagnostic {
 			if si == nil {

asset/importers/shader/revision_test.go

@@ -0,0 +1,23 @@
+package shader
+
+import (
+	"testing"
+
+	"aego/render/shaderx"
+)
+
+func TestDiagnosticRevisionDoesNotAllocate(t *testing.T) {
+	i := New()
+	i.record("assets/a.aeshader", []shaderx.Diag{{Code: shaderx.SHD001}})
+	_, before := i.Diagnostics()
+	if before == 0 || i.Revision() != before {
+		t.Fatal("diagnostic revision was not reported")
+	}
+	if n := testing.AllocsPerRun(100, func() { _ = i.Revision() }); n != 0 {
+		t.Fatalf("checking the revision allocates %v times", n)
+	}
+	i.record("assets/a.aeshader", nil)
+	if i.Revision() == before {
+		t.Fatal("clearing a diagnostic did not advance the revision")
+	}
+}

asset/importers/shader/shader.go

@@ -56,6 +56,13 @@ func (i *Importer) Diagnostics() ([]shaderx.Diag, uint64) {
 	return out, i.rev
 }
 
+// Revision allows consumers to check for changes without rebuilding the sorted diagnostics.
+func (i *Importer) Revision() uint64 {
+	i.mu.Lock()
+	defer i.mu.Unlock()
+	return i.rev
+}
+
 func (i *Importer) record(path string, diags []shaderx.Diag) {
 	i.mu.Lock()
 	defer i.mu.Unlock()

audio/pump/mixclock.go

@@ -0,0 +1,26 @@
+package pump
+
+import (
+	"math/bits"
+	"time"
+)
+
+// counterDuration converts monotonic performance-counter ticks without losing
+// sub-millisecond precision or overflowing on long intervals.
+func counterDuration(ticks, frequency uint64) time.Duration {
+	if frequency == 0 {
+		return 0
+	}
+	const maxDuration = uint64(1<<63 - 1)
+	seconds := ticks / frequency
+	if seconds > maxDuration/uint64(time.Second) {
+		return time.Duration(maxDuration)
+	}
+	hi, lo := bits.Mul64(ticks%frequency, uint64(time.Second))
+	nanos, _ := bits.Div64(hi, lo, frequency)
+	whole := seconds * uint64(time.Second)
+	if nanos > maxDuration-whole {
+		return time.Duration(maxDuration)
+	}
+	return time.Duration(whole + nanos)
+}

audio/pump/mixclock_other.go

@@ -0,0 +1,10 @@
+//go:build !windows
+
+package pump
+
+import "time"
+
+type mixClockSample struct{ start time.Time }
+
+func mixClockStart() mixClockSample                  { return mixClockSample{start: time.Now()} }
+func mixClockElapsed(s mixClockSample) time.Duration { return time.Since(s.start) }

audio/pump/mixclock_test.go

@@ -0,0 +1,54 @@
+package pump
+
+import (
+	"math"
+	"math/big"
+	"math/rand"
+	"testing"
+	"time"
+)
+
+func TestCounterDuration(t *testing.T) {
+	for _, tc := range []struct {
+		ticks, frequency uint64
+		want             time.Duration
+	}{
+		{0, 10_000_000, 0},
+		{1, 0, 0},
+		{1, 10_000_000, 100 * time.Nanosecond},
+		{1, 3, 333_333_333 * time.Nanosecond},
+		{15_000_000, 10_000_000, 1500 * time.Millisecond},
+		{math.MaxUint64 - 1, math.MaxUint64, 999_999_999 * time.Nanosecond},
+		{math.MaxUint64, 1, time.Duration(math.MaxInt64)},
+	} {
+		if got := counterDuration(tc.ticks, tc.frequency); got != tc.want {
+			t.Errorf("counterDuration(%d, %d) = %v; want %v", tc.ticks, tc.frequency, got, tc.want)
+		}
+	}
+}
+
+func TestCounterDurationMatchesExactArithmetic(t *testing.T) {
+	rng := rand.New(rand.NewSource(125))
+	limit := big.NewInt(math.MaxInt64)
+	for i := 0; i < 10000; i++ {
+		ticks, frequency := rng.Uint64(), rng.Uint64()|1
+		want := new(big.Int).SetUint64(ticks)
+		want.Mul(want, big.NewInt(int64(time.Second)))
+		want.Quo(want, new(big.Int).SetUint64(frequency))
+		if want.Cmp(limit) > 0 {
+			want.Set(limit)
+		}
+		if got := counterDuration(ticks, frequency); int64(got) != want.Int64() {
+			t.Fatalf("ticks=%d frequency=%d: got %v, want %s ns", ticks, frequency, got, want)
+		}
+	}
+}
+
+func TestMixStatisticsRecordDurations(t *testing.T) {
+	p := &Pump{}
+	p.record(150 * time.Nanosecond)
+	p.record(450 * time.Nanosecond)
+	if p.st.Blocks != 2 || p.st.MixMax != 450*time.Nanosecond || p.st.MixAvg != 300*time.Nanosecond {
+		t.Fatalf("incorrect measured mixing statistics: %+v", p.st)
+	}
+}

audio/pump/mixclock_windows.go

@@ -0,0 +1,59 @@
+package pump
+
+import (
+	"syscall"
+	"time"
+	"unsafe"
+)
+
+// Go's Windows monotonic time can advance in coarse interrupt-time steps, so
+// short audio blocks otherwise report zero despite doing work. QPC is the
+// Windows monotonic high-resolution interval clock; it does not change global
+// timer resolution or require a new dependency.
+var (
+	perfClock         = syscall.NewLazyDLL("kernel32.dll")
+	perfCounterAddr   = perfClock.NewProc("QueryPerformanceCounter").Addr()
+	perfFrequencyAddr = perfClock.NewProc("QueryPerformanceFrequency").Addr()
+	perfClockRate     = readPerfFrequency()
+)
+
+func readPerfFrequency() uint64 {
+	var value int64
+	ok, _, _ := syscall.SyscallN(perfFrequencyAddr, uintptr(unsafe.Pointer(&value)))
+	if ok == 0 || value <= 0 {
+		return 0
+	}
+	return uint64(value)
+}
+
+func readPerfCounter() (int64, bool) {
+	var value int64
+	ok, _, _ := syscall.SyscallN(perfCounterAddr, uintptr(unsafe.Pointer(&value)))
+	return value, ok != 0
+}
+
+type mixClockSample struct {
+	counter  int64
+	fallback time.Time
+	highRes  bool
+}
+
+func mixClockStart() mixClockSample {
+	if perfClockRate != 0 {
+		if counter, ok := readPerfCounter(); ok {
+			return mixClockSample{counter: counter, highRes: true}
+		}
+	}
+	return mixClockSample{fallback: time.Now()}
+}
+
+func mixClockElapsed(s mixClockSample) time.Duration {
+	if !s.highRes {
+		return time.Since(s.fallback)
+	}
+	end, ok := readPerfCounter()
+	if !ok || end <= s.counter {
+		return 0
+	}
+	return counterDuration(uint64(end-s.counter), perfClockRate)
+}

audio/pump/mixclock_windows_test.go

@@ -0,0 +1,26 @@
+package pump
+
+import "testing"
+
+func TestWindowsHighResolutionMixClock(t *testing.T) {
+	if perfClockRate == 0 {
+		t.Fatal("QueryPerformanceFrequency is unavailable")
+	}
+	start := mixClockStart()
+	if !start.highRes {
+		t.Fatal("QueryPerformanceCounter is unavailable")
+	}
+	var elapsed bool
+	for i := 0; i < 10000; i++ {
+		if mixClockElapsed(start) > 0 {
+			elapsed = true
+			break
+		}
+	}
+	if !elapsed {
+		t.Fatal("the high-resolution performance counter did not advance")
+	}
+	if allocs := testing.AllocsPerRun(1000, func() { _ = mixClockElapsed(mixClockStart()) }); allocs != 0 {
+		t.Fatalf("the audio timer allocated: %v allocations per measurement", allocs)
+	}
+}

audio/pump/pump.go

@@ -144,9 +144,9 @@ func (p *Pump) Fill() int {
 	}
 	n := 0
 	for q < target {
-		t := time.Now()
+		t := mixClockStart()
 		p.m.Mix(p.buf)
-		d := time.Since(t)
+		d := mixClockElapsed(t)
 		w := p.out.Write(p.buf)
 		p.record(d)
 		n++

cmd/aego/icons.go

@@ -25,6 +25,13 @@ func iconsUsage() string {
 
 func editorIcons() []module.IconUse {
 	out := iconuse.Uses()
+	// Module-provided toolbar icons belong in the application composition, not
+	// in the module-independent editor's icon registry.
+	out = append(out,
+		module.IconUse{ID: "render2d.normals", Owner: iconuse.Owner, Size: 16, By: "Scene View: surface normals"},
+		module.IconUse{ID: "render2d.point_light", Owner: iconuse.Owner, Size: 16, By: "Scene View: lighting preview"},
+		module.IconUse{ID: "render2d.shadow_view", Owner: iconuse.Owner, Size: 16, By: "Scene View: shadow visibility"},
+	)
 	for _, t := range projects.Templates {
 		if t.Icon != "" {
 			out = append(out, module.IconUse{ID: t.Icon, Owner: iconuse.Owner, By: "New Project: template " + t.ID, Size: 24})

cmd/aego/icons_doc_test.go

@@ -3,6 +3,7 @@ package main
 import (
 	"bytes"
 	"os"
+	"slices"
 	"strings"
 	"testing"
 
@@ -31,3 +32,23 @@ func TestIconsCheckReportsMissingEditorIcon(t *testing.T) {
 		t.Fatalf("a missing editor icon must fail the check:\n%s", b.String())
 	}
 }
+
+func TestIconsIncludeModuleToolbarUses(t *testing.T) {
+	report, err := iconReport()
+	if err != nil {
+		t.Fatal(err)
+	}
+	want := map[string]string{
+		"render2d.normals":     "Scene View: surface normals",
+		"render2d.point_light": "Scene View: lighting preview",
+		"render2d.shadow_view": "Scene View: shadow visibility",
+	}
+	for _, row := range report.Rows() {
+		if by, ok := want[row.ID]; ok && slices.Contains(row.UsedBy, by) {
+			delete(want, row.ID)
+		}
+	}
+	if len(want) != 0 {
+		t.Fatalf("module toolbar icons missing from the audit: %v", want)
+	}
+}

core/trace/chrome.go

@@ -29,7 +29,8 @@ func WriteChrome(w io.Writer, t *Tracer, frames []Frame) error {
 		bw.WriteString(`,{"name":"frame ` + u(f.Index) + `","ph":"X","pid":1,"tid":1,"ts":` + us(f.Start) +
 			`,"dur":` + us(f.Dur) + `,"args":{"gc":` + u(uint64(f.GC)) +
 			`,"dropped":` + u(uint64(f.Dropped)) + `,"world":` + u(f.World) + `,"frameId":` + u(f.FrameID) +
-			`,"firstTick":` + u(f.FirstTick) + `,"lastTick":` + u(f.LastTick) + `}}`)
+			`,"firstTick":` + u(f.FirstTick) + `,"lastTick":` + u(f.LastTick) +
+			`,"paceWaitNs":` + strconv.FormatInt(f.PaceWaitNS, 10) + `,"idleWaitNs":` + strconv.FormatInt(f.IdleWaitNS, 10) + `}}`)
 		for _, e := range f.Events {
 			name := `""`
 			if int(e.Zone) < len(names) {

core/trace/pacing_test.go

@@ -0,0 +1,56 @@
+package trace
+
+import (
+	"bytes"
+	"encoding/json"
+	"testing"
+	"time"
+)
+
+func TestPaceWaitMetadataSurvivesOverflowAndResets(t *testing.T) {
+	tr := New(Options{Frames: 2, Events: 1})
+	tr.SetEnabled(true)
+	zone := tr.Zone("test")
+	tr.BeginFrame()
+	tr.Begin(zone).End()
+	tr.Begin(zone).End() // No room for the pacing event itself.
+	tr.AddPaceWait(10*time.Millisecond, false)
+	tr.AddPaceWait(60*time.Millisecond, true)
+	tr.AddPaceWait(-time.Second, true)
+	tr.EndFrame()
+	f := tr.Frame(0)
+	if f.Dropped != 1 || f.PaceWaitNS != int64(70*time.Millisecond) || f.IdleWaitNS != int64(60*time.Millisecond) {
+		t.Fatalf("dropped=%d pace=%d idle=%d", f.Dropped, f.PaceWaitNS, f.IdleWaitNS)
+	}
+	snapshot := tr.Snapshot(1)
+	for range 2 {
+		tr.BeginFrame()
+		tr.EndFrame()
+	}
+	if f = tr.Frame(0); f.PaceWaitNS != 0 || f.IdleWaitNS != 0 {
+		t.Fatalf("reused frame retained wait: %+v", f)
+	}
+	if snapshot[0].PaceWaitNS != int64(70*time.Millisecond) || snapshot[0].IdleWaitNS != int64(60*time.Millisecond) {
+		t.Fatal("snapshot lost pacing metadata")
+	}
+	var out bytes.Buffer
+	if err := WriteChrome(&out, tr, snapshot); err != nil {
+		t.Fatal(err)
+	}
+	var exported struct {
+		Events []struct {
+			Args struct {
+				PaceWaitNS int64 `json:"paceWaitNs"`
+				IdleWaitNS int64 `json:"idleWaitNs"`
+			} `json:"args"`
+		} `json:"traceEvents"`
+	}
+	if err := json.Unmarshal(out.Bytes(), &exported); err != nil {
+		t.Fatal(err)
+	}
+	if len(exported.Events) < 2 || exported.Events[1].Args.PaceWaitNS != int64(70*time.Millisecond) || exported.Events[1].Args.IdleWaitNS != int64(60*time.Millisecond) {
+		t.Fatalf("exported pacing metadata: %+v", exported.Events)
+	}
+	var nilTracer *Tracer
+	nilTracer.AddPaceWait(time.Second, true)
+}

core/trace/trace.go

@@ -24,16 +24,19 @@ type Event struct {
 }
 
 type Frame struct {
-	Index     uint64
+	Index uint64
-	Start     int64
+	Start int64
-	Dur       int64
+	Dur   int64
-	GC        uint32
+	// PaceWaitNS is deliberate frame-limiter sleep; IdleWaitNS is its idle-mode part.
-	Dropped   uint32
+	PaceWaitNS int64
-	World     uint64
+	IdleWaitNS int64
-	FrameID   uint64
+	GC         uint32
-	FirstTick uint64
+	Dropped    uint32
-	LastTick  uint64
+	World      uint64
-	Events    []Event
+	FrameID    uint64
+	FirstTick  uint64
+	LastTick   uint64
+	Events     []Event
 }
 
 func (f *Frame) Duration() time.Duration {
@@ -158,6 +161,7 @@ func (t *Tracer) BeginFrame() {
 	t.seq++
 	f := &t.frames[t.head]
 	f.Index, f.Start, f.Dur, f.GC, f.Dropped = t.seq, t.now(), 0, 0, 0
+	f.PaceWaitNS, f.IdleWaitNS = 0, 0
 	f.World, f.FrameID, f.FirstTick, f.LastTick = 0, 0, 0, 0
 	f.Events = f.Events[:0]
 	t.cur, t.depth = f, 0
@@ -171,6 +175,17 @@ func (t *Tracer) Mark(world, frame, first, last uint64) {
 	f.World, f.FrameID, f.FirstTick, f.LastTick = world, frame, first, last
 }
 
+// AddPaceWait records intentional pacing independently of the event capacity.
+func (t *Tracer) AddPaceWait(d time.Duration, idle bool) {
+	if t == nil || t.cur == nil || d <= 0 {
+		return
+	}
+	t.cur.PaceWaitNS += int64(d)
+	if idle {
+		t.cur.IdleWaitNS += int64(d)
+	}
+}
+
 func (t *Tracer) EndFrame() {
 	if t == nil || t.cur == nil {
 		return

docs/icons.md

@@ -19,6 +19,8 @@ Sources are `<id>.svg` files in `engine/res/icons/src` and `modules/<id>/res/ico
 | `anim.slice` | engine | 16 | Create palette: Animation → Flipbook from Selection; PNG inspector: Slicing section | ok |
 | `anim.to_end` | engine | 16 | Animation panel: go to end | ok |
 | `anim.to_start` | engine | 16 | Animation panel: go to start | ok |
+| `animation.animator` | engine | 16 | component animation.Animator | ok |
+| `animation.player` | engine | 16 | component animation.AnimationPlayer | ok |
 | `app` | engine | 16 | launcher header; colored PNGs in app/brand are the window, installer and favicon icon | ok |
 | `app.quit` | engine | 16 | File → Quit | ok |
 | `audio.listener` | engine | 16 | component audio.AudioListener2D | ok |
@@ -36,7 +38,7 @@ Sources are `<id>.svg` files in `engine/res/icons/src` and `modules/<id>/res/ico
 | `cat.node` | engine | 24 | New Project: template empty; Search: node results; Add Component and Create: category | ok |
 | `cat.particles` | engine | 16 | Add Component and Create: Effects category; template menu Effects | ok |
 | `cat.physics` | engine | 16 | template menu Physics | ok |
-| `cat.render2d` | render2d | 16 | template menu Lighting | missing |
+| `cat.render2d` | engine | 16 | Add Component and Create: Lights category; template menu Lighting | ok |
 | `cat.rendering` | engine | 24 | New Project: template 2d; Search: mesh assets; Add Component and Create: category | ok |
 | `cat.scripts` | engine | 16 | Search: script symbols; Add Component and Create: category | ok |
 | `cat.settings` | engine | 16 | References: the project file; Add Component and Create: category | ok |
@@ -58,9 +60,9 @@ Sources are `<id>.svg` files in `engine/res/icons/src` and `modules/<id>/res/ico
 | `comp.persist` | engine | 16 | component save.Persist | ok |
 | `comp.polygon` | engine | 16 | Polygon shape component; Shapes debug overlay; component physics.PolygonCollider2D | ok |
 | `comp.rigidbody` | engine | 16 | component physics.Body2D; template physics.rigidbody | ok |
-| `comp.script` | engine | 16 | Scripts component; Assets menu: Attach to Selected; component engine.Script | ok |
+| `comp.script` | engine | 16 | Scripts component and Add Component entries; Assets menu: Attach to Selected; component engine.Script | ok |
 | `comp.shake` | engine | 16 | component camera.CameraShake2D | ok |
-| `comp.sprite` | engine | 16 | Create: Material and Material from Shader; material asset inspector; component engine.Light2D; component engine.MaterialOverride; component engine.SpriteRenderer; template render2d.directional-light; template render2d.point-light; template render2d.spot-light; template render2d.sprite; template render2d.sprite-light | ok |
+| `comp.sprite` | engine | 16 | Create: Material and Material from Shader; material asset inspector; component engine.MaterialOverride; component engine.SpriteRenderer; template render2d.sprite | ok |
 | `comp.tags` | engine | 16 | component engine.Tags | ok |
 | `comp.vcam` | engine | 16 | component camera.VirtualCamera2D | ok |
 | `comp.zone` | engine | 16 | component camera.CameraZone2D | ok |
@@ -92,6 +94,7 @@ Sources are `<id>.svg` files in `engine/res/icons/src` and `modules/<id>/res/ico
 | `file.autosave` | engine | 16 | File → Autosave Scripts | ok |
 | `file.data` | engine | 24 | Assets: data asset tiles | ok |
 | `file.download` | engine | 16 | Documentation: Install and run page; PNG inspector: Import section | ok |
+| `file.export` | engine | 16 | File → Export and the Export panel | ok |
 | `file.folder` | engine | 24 | Assets: folders | ok |
 | `file.mesh` | engine | 24 | Assets: mesh tiles | ok |
 | `file.open` | engine | 16 | Assets menu: Open | ok |
@@ -160,7 +163,7 @@ Sources are `<id>.svg` files in `engine/res/icons/src` and `modules/<id>/res/ico
 | `play.copy_back` | engine | 16 | Component menu during Play: Copy values to edit scene | ok |
 | `play.pause` | engine | 16 | toolbar: Pause; Animation panel: pause the clip | ok |
 | `play.speed` | engine | 16 | Play → Time Scale… | ok |
-| `play.start` | engine | 16 | component animation.AnimationPlayer; component animation.Animator; toolbar: Play; Assets: startup scene mark; Animation panel: play the clip | ok |
+| `play.start` | engine | 16 | toolbar: Play; Assets: startup scene mark; Animation panel: play the clip | ok |
 | `play.step` | engine | 16 | toolbar: Step | ok |
 | `play.step_back` | engine | 16 | Play → Step Back | ok |
 | `play.stop` | engine | 16 | toolbar: Stop | ok |
@@ -168,6 +171,12 @@ Sources are `<id>.svg` files in `engine/res/icons/src` and `modules/<id>/res/ico
 | `prefab.revert` | engine | 16 | Prefab menus: Revert and Reset to Prefab Value | ok |
 | `prefab.unpack` | engine | 16 | Hierarchy prefab menu: Unpack | ok |
 | `prefab.variant` | engine | 16 | Assets menu: Create Variant | ok |
+| `render2d.directional_light` | engine | 16 | template render2d.directional-light | ok |
+| `render2d.normals` | engine | 16 | Scene View: surface normals | ok |
+| `render2d.point_light` | engine | 16 | Scene View: lighting preview; component engine.Light2D; template render2d.point-light | ok |
+| `render2d.shadow_view` | engine | 16 | Scene View: shadow visibility | ok |
+| `render2d.spot_light` | engine | 16 | template render2d.spot-light | ok |
+| `render2d.sprite_light` | engine | 16 | template render2d.sprite-light | ok |
 | `shape.cube` | engine | 16 | template render3d.cube | ok |
 | `shape.cylinder` | engine | 16 | template render3d.cylinder | ok |
 | `shape.dice` | engine | 16 | Documentation: random numbers module | ok |

editor/core/command/command.go

@@ -135,8 +135,10 @@ type Desc struct {
 	Checked  func() bool
 	Enabled  func() bool
 	Run      func() error
-	nameKey  string
+	// SearchRun optionally opens an item rather than toggling it from Search Everywhere.
-	tipKey   string
+	SearchRun func() error
+	nameKey   string
+	tipKey    string
 }
 
 // Info adds an icon and a tooltip to a command registered elsewhere.
@@ -312,6 +314,15 @@ func (r *Registry) Enabled(id string) bool {
 }
 
 func (r *Registry) Run(id string) error {
+	return r.run(id, false)
+}
+
+// RunFromSearch uses the search-specific action when one is registered.
+func (r *Registry) RunFromSearch(id string) error {
+	return r.run(id, true)
+}
+
+func (r *Registry) run(id string, search bool) error {
 	d, ok := r.byID[id]
 	if !ok {
 		return errs.New(errs.EditorCommand, "unknown command", log.F("command", id))
@@ -319,7 +330,11 @@ func (r *Registry) Run(id string) error {
 	if d.Enabled != nil && !d.Enabled() {
 		return errs.New(errs.EditorCommand, "command is disabled", log.F("command", id))
 	}
-	err := d.Run()
+	run := d.Run
+	if search && d.SearchRun != nil {
+		run = d.SearchRun
+	}
+	err := run()
 	if err != nil && r.OnError != nil {
 		r.OnError(id, err)
 	}

editor/core/command/command_test.go

@@ -1,11 +1,47 @@
 package command
 
 import (
+	"errors"
 	"testing"
 
 	"aego/platform/input"
 )
 
+func TestRunFromSearchUsesOptionalAction(t *testing.T) {
+	r := New()
+	var normal, search int
+	failure := errors.New("search failed")
+	var reported error
+	r.OnError = func(id string, err error) { reported = err }
+	if err := r.Register(Desc{ID: "window.example", Run: func() error {
+		normal++
+		return nil
+	}, SearchRun: func() error {
+		search++
+		return failure
+	}}); err != nil {
+		t.Fatal(err)
+	}
+	if err := r.Run("window.example"); err != nil || normal != 1 || search != 0 {
+		t.Fatalf("normal action: %v, normal %d, search %d", err, normal, search)
+	}
+	if err := r.RunFromSearch("window.example"); !errors.Is(err, failure) || !errors.Is(reported, failure) || search != 1 {
+		t.Fatalf("search action: %v, reported %v, ran %d", err, reported, search)
+	}
+	if err := r.Register(Desc{ID: "ordinary", Run: func() error { normal++; return nil }}); err != nil {
+		t.Fatal(err)
+	}
+	if err := r.RunFromSearch("ordinary"); err != nil || normal != 2 {
+		t.Fatalf("ordinary action from search: %v, ran %d", err, normal)
+	}
+	if err := r.Register(Desc{ID: "disabled", Enabled: func() bool { return false }, Run: func() error { return nil }, SearchRun: func() error { search++; return nil }}); err != nil {
+		t.Fatal(err)
+	}
+	if err := r.RunFromSearch("disabled"); err == nil || search != 1 {
+		t.Fatal("search must not run a disabled command")
+	}
+}
+
 func TestAltShortcutDispatches(t *testing.T) {
 	r := New()
 	ran := 0

editor/core/command/menu.go

@@ -20,6 +20,7 @@ func MenuItem(ui *core.Context, reg *Registry, id, label string) bool {
 		Tip:      d.TipText(),
 		Enabled:  reg.Enabled(id),
 		Checked:  d.Checked != nil && d.Checked(),
+		KeepOpen: d.Checked != nil,
 	}
 	if widgets.Entry(ui, it) {
 		reg.Run(id)

editor/core/iconuse/iconuse.go

@@ -40,6 +40,7 @@ var Editor = []module.IconUse{
 	use("cat.engine", 14, "Agent panel: steps that read component types"),
 	use("cat.node", 16, "Search: node results; Add Component and Create: category"),
 	use("cat.particles", 16, "Add Component and Create: Effects category"),
+	use("cat.render2d", 16, "Add Component and Create: Lights category"),
 	use("cat.rendering", 16, "Search: mesh assets; Add Component and Create: category"),
 	use("cat.scripts", 16, "Search: script symbols; Add Component and Create: category"),
 	use("cat.settings", 16, "References: the project file; Add Component and Create: category"),
@@ -50,7 +51,7 @@ var Editor = []module.IconUse{
 	use("comp.joint_revolute", 16, "Revolute Joint 2D component; Joints debug overlay"),
 	use("comp.polygon", 16, "Polygon shape component; Shapes debug overlay"),
 	use("comp.sprite", 16, "Create: Material and Material from Shader; material asset inspector"),
-	use("comp.script", 16, "Scripts component; Assets menu: Attach to Selected"),
+	use("comp.script", 16, "Scripts component and Add Component entries; Assets menu: Attach to Selected"),
 	use("dbg.aabbs", 16, "AABBs debug overlay"),
 	use("dbg.broadphase", 16, "Broadphase Tree debug overlay"),
 	use("dbg.contacts", 16, "Contacts debug overlay; Vectors → Contact Impulses"),
@@ -78,6 +79,7 @@ var Editor = []module.IconUse{
 	use("file.audio", 16, "Documentation: sound clips page"),
 	use("file.autosave", 16, "File → Autosave Scripts"),
 	use("file.download", 16, "Documentation: Install and run page; PNG inspector: Import section"),
+	use("file.export", 16, "File → Export and the Export panel"),
 	use("file.data", 24, "Assets: data asset tiles"),
 	use("file.folder", 24, "Assets: folders"),
 	use("file.mesh", 24, "Assets: mesh tiles"),

editor/core/preview/cards.go

@@ -10,6 +10,8 @@ import (
 	"image/png"
 	"math"
 	"strings"
+
+	"aego/editor/core/code/highlight"
 )
 
 type glyph struct {
@@ -91,6 +93,51 @@ func (s *Service) card(header string, lines []string) pixels {
 	return raster(im)
 }
 
+// codeCard draws code as colored strokes rather than shrinking bitmap glyphs
+// into illegible noise at the 48–96px sizes of the asset browser.
+func codeCard(lines []string) pixels {
+	im := canvas()
+	draw.Draw(im, image.Rect(0, 0, Size, 5), image.NewUniform(accent), image.Point{}, draw.Src)
+	palette := [highlight.KindCount]color.NRGBA{}
+	for i := range palette {
+		palette[i] = color.NRGBA{175, 186, 197, 255}
+	}
+	palette[highlight.Keyword] = color.NRGBA{180, 145, 220, 255}
+	palette[highlight.Script] = color.NRGBA{180, 145, 220, 255}
+	palette[highlight.String] = color.NRGBA{165, 200, 140, 255}
+	palette[highlight.Number] = color.NRGBA{220, 165, 115, 255}
+	palette[highlight.Comment] = color.NRGBA{105, 130, 130, 255}
+	palette[highlight.Type] = color.NRGBA{115, 190, 210, 255}
+	var state highlight.State
+	var spans []highlight.Span
+	for lineNo, line := range lines {
+		y := 13 + lineNo*9
+		if y+3 >= Size-3 {
+			break
+		}
+		spans, state = highlight.Line([]byte(line), state, spans)
+		for _, sp := range spans {
+			start := -1
+			for i := sp.Start; i <= sp.End; i++ {
+				if i < sp.End && line[i] != ' ' && line[i] != '\t' {
+					if start < 0 {
+						start = i
+					}
+					continue
+				}
+				if start >= 0 {
+					x0, x1 := 7+start*3, min(7+i*3, Size-7)
+					if x0 < x1 {
+						draw.Draw(im, image.Rect(x0, y, x1, y+3), image.NewUniform(palette[sp.Kind]), image.Point{}, draw.Src)
+					}
+					start = -1
+				}
+			}
+		}
+	}
+	return raster(im)
+}
+
 func fitPixels(im *image.NRGBA, area image.Rectangle, p pixels) {
 	if p.w < 1 || p.h < 1 {
 		return

editor/core/preview/content.go

@@ -257,10 +257,13 @@ func (s *Service) startCard(e asset.Entry, it *item, spec tasks.Spec, bad bool)
 		reason = "GPU preview unavailable in this session"
 	}
 	it.task = s.d.Tasks.Work(spec, func(*tasks.Task) error {
+		cached := false
 		if !bad && reason == "" {
-			if cached, err := s.load(key); err == nil {
+			if old, err := s.load(key); err == nil {
-				out = cached
+				out, cached = old, true
-				return nil
+				if !codeEntry(e) {
+					return nil
+				}
 			}
 		}
 
@@ -286,6 +289,9 @@ func (s *Service) startCard(e asset.Entry, it *item, spec tasks.Spec, bad bool)
 		}
 
 		lines = cardLines(e, src)
+		if cached {
+			return nil
+		}
 		if len(src) == 0 && len(e.Artifacts) > 0 && s.d.Pipeline != nil {
 			a := e.Artifacts[0]
 			if f, err := s.d.Pipeline.Artifacts().Open(a.Path); err == nil {
@@ -315,7 +321,11 @@ func (s *Service) startCard(e asset.Entry, it *item, spec tasks.Spec, bad bool)
 		if reason != "" {
 			lines = append([]string{"! " + reason}, lines...)
 		}
-		out = s.card(string(e.Kind), lines)
+		if codeEntry(e) && reason == "" && len(src) > 0 {
+			out = codeCard(lines)
+		} else {
+			out = s.card(string(e.Kind), lines)
+		}
 		if reason == "" {
 			return s.save(key, out)
 		}
@@ -332,6 +342,10 @@ func (s *Service) startCard(e asset.Entry, it *item, spec tasks.Spec, bad bool)
 	})
 }
 
+func codeEntry(e asset.Entry) bool {
+	return e.Kind == asset.ArtScript || e.Kind == SourceKind && strings.EqualFold(filepath.Ext(e.Source), ".go")
+}
+
 func textKind(e asset.Entry) bool {
 	switch strings.ToLower(filepath.Ext(e.Source)) {
 	case ".go", ".aes", ".aeshader", ".glsl", ".vert", ".frag", ".aedata", ".aetable", ".aepreset", ".aectrl", ".aeanim", ".aemat", ".aescene", ".aeprefab", ".aego", ".aetext", ".json", ".csv", ".toml":
@@ -343,21 +357,6 @@ func textKind(e asset.Entry) bool {
 func cardLines(e asset.Entry, src []byte) []string {
 	if len(src) > 0 && !bytes.ContainsRune(src, 0) && textKind(e) {
 		ls := firstLines(string(src), lineCount)
-		if e.Kind == asset.ArtScript || filepath.Ext(e.Source) == ".go" {
-			var decl []string
-			for _, line := range strings.Split(string(src), "\n") {
-				l := strings.TrimSpace(line)
-				for _, k := range []string{"script ", "func ", "type "} {
-					if strings.HasPrefix(l, k) {
-						decl = append(decl, strings.TrimSuffix(l, " {"))
-						break
-					}
-				}
-			}
-			if len(decl) > 0 {
-				ls = decl
-			}
-		}
 		if len(ls) > 0 {
 			return ls
 		}

editor/core/preview/preview.go

@@ -174,6 +174,9 @@ func (s *Service) Key(e asset.Entry) (string, bool) {
 	}
 	h := sha256.New()
 	fmt.Fprintf(h, "%s:%d:%s:%s", salt, Size, s.handlers[e.Kind].Version, e.Kind)
+	if codeEntry(e) {
+		fmt.Fprint(h, "|code-preview-v2")
+	}
 	if s.handlers[e.Kind].Render != nil && !s.gpuOK {
 		fmt.Fprint(h, "|no-gpu")
 	}
@@ -296,7 +299,7 @@ func (s *Service) Missing(info pipeline.AssetInfo) bool {
 }
 
 func (s *Service) Lines(info pipeline.AssetInfo) []string {
-	if info.Kind != asset.ArtScript {
+	if !codeEntry(asset.Entry{Kind: info.Kind, Source: info.Path}) {
 		return nil
 	}
 	if it := s.ensure(info); it != nil {

editor/core/preview/preview_test.go

@@ -5,6 +5,7 @@ import (
 	"aego/render/rt"
 	"aego/render/view"
 	"bytes"
+	"strings"
 	"testing"
 
 	"aego/asset"
@@ -85,3 +86,23 @@ func TestFirstLinesSkipImports(t *testing.T) {
 		t.Fatalf("lines = %q", got)
 	}
 }
+
+func TestScriptPreviewUsesSourceAndColoredStrokes(t *testing.T) {
+	src := []byte("package game\n\nscript Player {\n  var Speed float = 10\n  func Update() {\n    Speed = 20\n  }\n}\n")
+	e := asset.Entry{Kind: asset.ArtScript, Source: "scripts/player.aes"}
+	lines := cardLines(e, src)
+	if len(lines) < 3 || lines[0] != "script Player {" || !strings.Contains(strings.Join(lines, "\n"), "Speed = 20") {
+		t.Fatalf("preview lost the script contents: %q", lines)
+	}
+	p := codeCard(lines)
+	if p.w != Size || p.h != Size {
+		t.Fatalf("bad card dimensions: %d×%d", p.w, p.h)
+	}
+	colors := map[[4]byte]bool{}
+	for i := 0; i < len(p.buf); i += 4 {
+		colors[[4]byte(p.buf[i:i+4])] = true
+	}
+	if len(colors) < 4 {
+		t.Fatalf("code preview has no syntax strokes: %d colors", len(colors))
+	}
+}

editor/core/workspace/layouts.go

@@ -33,6 +33,8 @@ type Preset struct {
 	// Explicit prescribes a default layout, without affecting existing saved layouts.
 	Explicit bool
 	Front    []string
+	// Splits place default panels beside their anchors; saved layouts are unchanged.
+	Splits []PanelSplit
 	// Rev drops layouts saved for an older revision of a built-in preset.
 	Rev   int
 	Owner string
@@ -40,6 +42,12 @@ type Preset struct {
 	Base  string
 }
 
+type PanelSplit struct {
+	Panel, Anchor string
+	Side          dock.Side
+	Ratio         float32
+}
+
 type layout struct {
 	tree    []byte
 	toolbar bool
@@ -76,6 +84,7 @@ func (w *Workspace) RegisterPreset(p Preset) error {
 	}
 	p.Slots = maps.Clone(p.Slots)
 	p.Front = slices.Clone(p.Front)
+	p.Splits = slices.Clone(p.Splits)
 	w.presets = append(w.presets, p)
 	slices.SortStableFunc(w.presets, func(a, b Preset) int { return a.Order - b.Order })
 	if w.cur == "" {
@@ -157,6 +166,17 @@ func (w *Workspace) layoutFor(p *Preset) *dock.Tree {
 	}
 	t := dock.Columns(cols[SlotLeft], cols[SlotBrowser], cols[SlotCenter], cols[SlotBottom], cols[SlotRight])
 	if p != nil {
+		for _, split := range p.Splits {
+			if !t.Has(split.Panel) || !t.Has(split.Anchor) || split.Panel == split.Anchor {
+				continue
+			}
+			t.DockPanel(split.Panel, t.FindPanel(split.Anchor), split.Side)
+			if node, ok := t.Node(t.FindPanel(split.Panel)); ok && split.Side != dock.SideCenter && node.Parent != 0 && split.Ratio > 0 && split.Ratio < 1 {
+				if parent, ok := t.Node(node.Parent); ok && parent.Kind == dock.KindSplit {
+					parent.Ratio = split.Ratio
+				}
+			}
+		}
 		for _, id := range p.Front {
 			t.Activate(id)
 		}

editor/ext/inspect/registry.go

@@ -21,6 +21,16 @@ type FieldVisibility interface {
 	FieldVisible(ctx *context.Editor, nodes []ids.NodeID, field *schema.FieldDescriptor) bool
 }
 
+// FieldValidation supplies a localized explanation for an invalid field.
+type FieldValidation interface {
+	FieldError(ctx *context.Editor, nodes []ids.NodeID, field *schema.FieldDescriptor) string
+}
+
+// NormalizedCurve marks curves whose key times must stay within 0..1.
+type NormalizedCurve interface {
+	NormalizedCurve(ctx *context.Editor, nodes []ids.NodeID, field *schema.FieldDescriptor) bool
+}
+
 type CustomFunc func(ctx *context.Editor, nodes []ids.NodeID, defaultFields func())
 
 func (f CustomFunc) Draw(ctx *context.Editor, nodes []ids.NodeID, defaultFields func()) {
@@ -63,6 +73,28 @@ func (r *Registry) FieldVisible(t schema.TypeID, nodes []ids.NodeID, field *sche
 	return !ok || filter.FieldVisible(r.editor, nodes, field)
 }
 
+func (r *Registry) FieldError(t schema.TypeID, nodes []ids.NodeID, field *schema.FieldDescriptor) string {
+	c, ok := r.Custom(t)
+	if !ok {
+		return ""
+	}
+	if validation, ok := c.(FieldValidation); ok {
+		return validation.FieldError(r.editor, nodes, field)
+	}
+	return ""
+}
+
+func (r *Registry) NormalizedCurve(t schema.TypeID, nodes []ids.NodeID, field *schema.FieldDescriptor) bool {
+	c, ok := r.Custom(t)
+	if !ok {
+		return false
+	}
+	if limits, ok := c.(NormalizedCurve); ok {
+		return limits.NormalizedCurve(r.editor, nodes, field)
+	}
+	return false
+}
+
 func NewRegistry() *Registry {
 	return &Registry{
 		custom:   map[schema.TypeID]Custom{},

editor/ext/safe.go

@@ -90,6 +90,32 @@ func (s *safeCustom) FieldVisible(ctx *context.Editor, nodes []ids.NodeID, field
 	return true
 }
 
+func (s *safeCustom) FieldError(ctx *context.Editor, nodes []ids.NodeID, field *schema.FieldDescriptor) (message string) {
+	defer func() {
+		if rec := recover(); rec != nil {
+			s.reg.Disable(s.ext, fmt.Sprint(rec))
+			message = ""
+		}
+	}()
+	if v, ok := s.inner.(inspect.FieldValidation); ok {
+		return v.FieldError(ctx, nodes, field)
+	}
+	return ""
+}
+
+func (s *safeCustom) NormalizedCurve(ctx *context.Editor, nodes []ids.NodeID, field *schema.FieldDescriptor) (normalized bool) {
+	defer func() {
+		if rec := recover(); rec != nil {
+			s.reg.Disable(s.ext, fmt.Sprint(rec))
+			normalized = false
+		}
+	}()
+	if v, ok := s.inner.(inspect.NormalizedCurve); ok {
+		return v.NormalizedCurve(ctx, nodes, field)
+	}
+	return false
+}
+
 type safeGizmo struct {
 	inner gizmo.Gizmo
 	ext   string

editor/panels/agent/header_test.go

@@ -0,0 +1,85 @@
+package agent
+
+import (
+	"strconv"
+	"testing"
+
+	"aego/core/mathx"
+	"aego/editor/core/follow"
+	"aego/editor/core/presence"
+	edselection "aego/editor/core/selection"
+	"aego/editor/core/services"
+	"aego/platform/input"
+	"aego/render/text"
+	"aego/ui/core"
+	"aego/ui/theme"
+)
+
+type toolbarTestHost struct {
+	*providerTestHost
+	auto bool
+}
+
+func (h *toolbarTestHost) AutoApply() bool     { return h.auto }
+func (h *toolbarTestHost) SetAutoApply(v bool) { h.auto = v }
+
+func TestAgentHeaderControlsRemainUsableWhenNarrow(t *testing.T) {
+	for _, width := range []float32{420, 260} {
+		t.Run(strconv.Itoa(int(width)), func(t *testing.T) {
+			h := &toolbarTestHost{providerTestHost: newProviderTestHost()}
+			p := providerPanel(t, h.providerTestHost)
+			p.d.Host = h
+			p.d.Follow = follow.New(presence.New(), edselection.New(), nil)
+			ui := core.New(text.NewFont(14, 1, 18, 14))
+			ui.Theme = theme.Editor()
+			in := &input.State{}
+			r := mathx.Rect{W: width, H: 520}
+			frame := func(at mathx.Vec2, down, up bool) {
+				in.BeginFrame()
+				in.ApplyMouseMove(at, mathx.Vec2{})
+				if down {
+					in.ApplyMouseDown(at, input.MouseLeft)
+				}
+				if up {
+					in.ApplyMouseUp(at, input.MouseLeft)
+				}
+				ui.Begin(in, mathx.V2(800, 600), 1)
+				ui.Region(r)
+				p.Draw(&services.Frame{UI: ui}, r)
+				ui.PopCursor()
+				ui.End()
+			}
+			click := func(at mathx.Vec2) { frame(at, true, false); frame(at, false, true); frame(at, false, false) }
+			frame(mathx.V2(0, 0), false, false)
+			pad, row := ui.Theme.Padding, ui.Theme.RowHeight
+			y := row + pad + pad + row/2
+			more := mathx.V2(width-pad-row/2, y)
+			followAt := mathx.V2(width-pad-row-4-row/2, y)
+			right := width - pad - 2*(row+4)
+			auto := mathx.V2(right-row/2, y)
+			click(auto)
+			if !h.auto {
+				t.Fatal("auto-apply control is missing or overlaps its neighbours")
+			}
+			click(followAt)
+			if !p.d.Follow.On() {
+				t.Fatal("follow button is missing or overlaps its neighbours")
+			}
+			p.d.Follow.UserActive(1)
+			click(followAt)
+			if !p.d.Follow.Active() {
+				t.Fatal("the follow button must resume a paused follow")
+			}
+			click(more)
+			if !ui.PopupOpen(p.menu) {
+				t.Fatal("session menu button is missing or overlaps its neighbours")
+			}
+			ui.CloseAllPopups()
+			settings := mathx.V2(p.settingsRect.X+p.settingsRect.W/2, p.settingsRect.Y+p.settingsRect.H/2)
+			click(settings)
+			if !ui.PopupOpen(p.providerSettings) {
+				t.Fatal("settings button is missing or overlaps the provider picker")
+			}
+		})
+	}
+}

editor/panels/agent/idle_allocs_test.go

@@ -0,0 +1,40 @@
+package agent
+
+import (
+	"testing"
+
+	"aego/core/mathx"
+	"aego/editor/core/services"
+	"aego/platform/input"
+	"aego/render/text"
+	"aego/ui/core"
+	"aego/ui/theme"
+)
+
+// Measure the panel itself independently of asynchronous editor work.
+func TestIdlePanelDrawDoesNotAllocate(t *testing.T) {
+	p := providerPanel(t, newProviderTestHost())
+	ui := core.New(text.NewFont(14, 1, 18, 14))
+	ui.Theme = theme.Editor()
+	in := &input.State{}
+	r := mathx.Rect{W: 420, H: 520}
+	frame := func(draw bool) {
+		in.BeginFrame()
+		ui.Begin(in, mathx.V2(800, 600), 1)
+		ui.Region(r)
+		if draw {
+			p.Draw(&services.Frame{UI: ui}, r)
+		}
+		ui.PopCursor()
+		ui.End()
+	}
+	for range 60 {
+		frame(false)
+		frame(true)
+	}
+	base := testing.AllocsPerRun(100, func() { frame(false) })
+	with := testing.AllocsPerRun(100, func() { frame(true) })
+	if with > base {
+		t.Fatalf("idle panel adds allocations: base=%v with panel=%v", base, with)
+	}
+}

editor/panels/agent/mentions_test.go

@@ -0,0 +1,91 @@
+package agent
+
+import (
+	"strings"
+	"testing"
+
+	"aego/core/mathx"
+	"aego/editor/core/document"
+	"aego/editor/core/services"
+	"aego/engine/base"
+	"aego/platform/input"
+	"aego/scene"
+	"aego/ui/core"
+)
+
+func TestMentionTypedSearchPickedAndInsertedAtCaret(t *testing.T) {
+	for _, tc := range []struct {
+		name, query, label, full string
+	}{
+		{"node", "Hero", "@Hero", "@Hero (#"},
+		{"asset", "walk", "@player_walk.aeanim", "@assets/anim/player_walk.aeanim"},
+	} {
+		t.Run(tc.name, func(t *testing.T) {
+			types, err := base.NewTypes()
+			if err != nil {
+				t.Fatal(err)
+			}
+			sc := scene.New(types, nil, scene.Options{})
+			sc.Create(sc.Root(), "Hero")
+			sc.Flush()
+			mgr := document.NewManager(document.Options{Root: t.TempDir(), Types: types})
+			doc := mgr.New("scenes/main.aescene", sc)
+			host := newProviderTestHost()
+			p := providerPanel(t, host)
+			p.d.Docs = &quickDocs{doc: doc}
+			p.d.Assets = func() []string { return []string{"assets/anim/player_walk.aeanim", "assets/anim/enemy.aectrl"} }
+			p.Ask("end")
+			ui, in := core.New(nil), &input.State{}
+			r := mathx.Rect{W: 480, H: 520}
+			draw := func() {
+				ui.Begin(in, mathx.V2(800, 600), 1)
+				ui.Region(r)
+				p.Draw(&services.Frame{UI: ui}, r)
+				ui.PopCursor()
+				ui.End()
+			}
+			frame := func(event func()) {
+				in.BeginFrame()
+				if event != nil {
+					event()
+				}
+				draw()
+			}
+			frame(nil)
+			frame(func() { in.ApplyKeyDown(input.KeyHome, 0, 0, false) })
+			frame(func() { in.ApplyKeyUp(input.KeyHome, 0, 0) })
+			frame(func() { in.ApplyText([]byte("@")) })
+			if p.pal == nil || !p.pal.Active() || p.input != "end" || ui.Focus() != p.pal.SearchID() {
+				t.Fatalf("opening lost the draft or focus: input=%q focus=%v", p.input, ui.Focus())
+			}
+			frame(func() { in.ApplyText([]byte(tc.query)) })
+			if p.pal.Query() != tc.query || p.input != "end" {
+				t.Fatalf("search copied trigger or leaked into draft: query=%q input=%q", p.pal.Query(), p.input)
+			}
+			frame(func() { in.ApplyKeyDown(input.KeyEnter, 0, 0, false) })
+			if p.pal.Active() || p.input != tc.label+" end" || len(p.picked) != 1 {
+				t.Fatalf("selection not inserted at caret: %q, %#v", p.input, p.picked)
+			}
+			frame(func() { in.ApplyKeyUp(input.KeyEnter, 0, 0) })
+			frame(func() { in.ApplyText([]byte("!")) })
+			if p.input != tc.label+" !end" {
+				t.Fatalf("typing did not resume at the caret: %q", p.input)
+			}
+			p.send()
+			if len(host.sent) != 1 || !strings.Contains(host.sent[0], tc.full) {
+				t.Fatalf("missing full reference in sent text: %q", host.sent)
+			}
+		})
+	}
+}
+
+func TestMentionAssetIcons(t *testing.T) {
+	for path, want := range map[string]string{
+		"assets/walk.aeanim": "anim.key", "assets/player.aectrl": "anim.graph",
+		"assets/scene.aescene": "file.scene", "assets/data.aetable": "file.table",
+	} {
+		if got := assetIcon(path); got != want {
+			t.Errorf("assetIcon(%q) = %q, want %q", path, got, want)
+		}
+	}
+}

editor/panels/agent/provider.go

@@ -170,7 +170,7 @@ func (p *Panel) providerRow(ui *core.Context, r mathx.Rect) float32 {
 	row := mathx.Rect{X: r.X + th.Padding, Y: r.Y + th.Padding/2, W: max(0, r.W-2*th.Padding), H: th.RowHeight}
 	ui.Rect(mathx.Rect{X: r.X, Y: r.Y, W: r.W, H: height}, th.Header)
 	label := i18n.Tr("editor.agent.provider_settings", "Agent settings")
-	settingsW := min(row.W/2, ui.TextSize(label).X+20)
+	settingsW := min(row.W, row.H)
 	choice := mathx.Rect{X: row.X, Y: row.Y, W: min(140, max(0, row.W-settingsW-6)), H: row.H}
 	index := 0
 	if provider == "codex" {
@@ -187,7 +187,7 @@ func (p *Panel) providerRow(ui *core.Context, r mathx.Rect) float32 {
 	}
 	settings := mathx.Rect{X: row.X + row.W - settingsW, Y: row.Y, W: settingsW, H: row.H}
 	p.settingsRect = settings
-	if widgets.ButtonRect(ui, ui.ID("provider-settings"), settings, label) {
+	if agentButton(ui, ui.ID("provider-settings"), settings, "panel.settings", "", label, ui.PopupOpen(p.providerSettings)) {
 		p.readProviderSettings()
 		p.loadModels()
 		ui.OpenPopup(p.providerSettings, mathx.Vec2{X: max(0, settings.X+settings.W-360), Y: row.Y + row.H + 4})
@@ -202,6 +202,8 @@ func (p *Panel) providerRow(ui *core.Context, r mathx.Rect) float32 {
 		}
 		mr := mathx.Rect{X: choice.X + choice.W + 8, Y: row.Y, W: max(0, settings.X-choice.X-choice.W-16), H: row.H}
 		ui.TextIn(mr, p.fits[4].get(ui, model, mr.W), th.TextDim, core.AlignLeft)
+		ui.MouseOver(ui.ID("model-status"), mr)
+		widgets.Tooltip(ui, ui.ID("model-status"), model)
 	}
 	p.providerPopup(ui)
 	return height

editor/panels/agent/timeline.go

@@ -6,12 +6,10 @@ import (
 
 	"aego/core/mathx"
 	"aego/editor/core/agentui"
-	"aego/editor/core/follow"
 	"aego/editor/core/presence"
 	"aego/engine/i18n"
 	"aego/ui/core"
 	"aego/ui/widgets"
-	wpresence "aego/ui/widgets/presence"
 )
 
 // dot is one tool call on the activity timeline: where its block is and how it went.
@@ -165,49 +163,6 @@ func (p *Panel) undoBack(card int) {
 	}
 }
 
-// where is the row under the header: where the agent is now, and Resume while following is paused.
-func (p *Panel) where(ui *core.Context, r mathx.Rect) {
-	th := &ui.Theme
-	f := p.d.Follow
-	if f == nil {
-		return
-	}
-	ui.Rect(r, th.PanelAlt)
-	x := r.X + th.Padding
-	right := r.X + r.W - th.Padding
-	if f.Paused() {
-		label := i18n.Tr("editor.agent.resume", "Resume Following")
-		bw := ui.TextSize(label).X + 20
-		if widgets.ButtonRect(ui, ui.ID("resume"), mathx.Rect{X: right - bw, Y: r.Y + 2, W: bw, H: r.H - 4}, label) {
-			f.ResumeNow()
-		}
-		right -= bw + 6
-	}
-	sp, at, ok := f.Model.Where(follow.Agent, p.now())
-	if !ok {
-		text := i18n.Tr("editor.agent.following", "Following the agent")
-		if f.Paused() {
-			text = i18n.Tr("editor.agent.following_paused", "Following paused while you work")
-		}
-		ui.Text(p.fits[3].get(ui, text, right-x), mathx.Vec2{X: x, Y: ui.TextY(r)}, th.TextDim)
-		return
-	}
-	wpresence.Marker(ui, mathx.Rect{X: x, Y: r.Y + (r.H-14)/2, W: 14, H: 14}, p.now()-at)
-	x += 20
-	label := p.spotLabel(sp)
-	lr := mathx.Rect{X: x, Y: r.Y, W: min(ui.TextSize(label).X+4, right-x), H: r.H}
-	id := ui.ID("where")
-	if ui.Clicked(id, lr) {
-		f.GoTo(sp)
-	}
-	col := th.Text
-	if ui.Hot() == id {
-		col = th.Accent
-	}
-	ui.Text(p.fits[3].get(ui, label, right-x), mathx.Vec2{X: x, Y: ui.TextY(r)}, col)
-	widgets.Tooltip(ui, id, i18n.Tr("editor.agent.where_tip", "Where the agent works now; click to go there"))
-}
-
 // spotLabel is a place as the user names it: the file, then the node and the component, or the line.
 func (p *Panel) spotLabel(sp presence.Spot) string {
 	label := docName(sp.Doc)

editor/panels/agent/transcript.go

@@ -441,7 +441,11 @@ func (p *Panel) empty(ui *core.Context, body mathx.Rect) {
 	ui.TextIn(mathx.Rect{X: x, Y: y, W: w, H: th.RowHeight}, i18n.Tr("editor.agent.empty_title", "Ask the agent"), th.Text, core.AlignCenter)
 	y += th.RowHeight
 	hint := i18n.Tr("editor.agent.empty_hint", "Ask about the project or describe a change. Type @ to mention a node or an asset. Changes wait for you to apply them.")
-	for _, line := range widgets.WrapLines(ui, hint, w) {
+	if p.emptyHint != hint || p.emptyHintWidth != w || p.emptyHintFont != ui.Font() {
+		p.emptyHint, p.emptyHintWidth, p.emptyHintFont = hint, w, ui.Font()
+		p.emptyHintLines = widgets.WrapLines(ui, hint, w)
+	}
+	for _, line := range p.emptyHintLines {
 		ui.TextIn(mathx.Rect{X: x, Y: y, W: w, H: ui.LineHeight()}, line, th.TextDim, core.AlignCenter)
 		y += ui.LineHeight()
 	}
@@ -477,7 +481,7 @@ func (p *Panel) empty(ui *core.Context, body mathx.Rect) {
 		}
 		ui.RoundRect(er, th.Radius.Button, fill)
 		widgets.IconAt(ui, mathx.Rect{X: er.X + 8, Y: er.Y + (er.H-14)/2, W: 14, H: 14}, "agent.new", th.TextDim)
-		ui.Text(widgets.Elide(ui, ex, er.W-36), mathx.Vec2{X: er.X + 30, Y: ui.TextY(er)}, th.Text)
+		ui.Text(p.emptyFits[i].get(ui, ex, er.W-36), mathx.Vec2{X: er.X + 30, Y: ui.TextY(er)}, th.Text)
 		y += er.H + th.Spacing
 	}
 }

editor/panels/assets/panel.go

@@ -234,6 +234,7 @@ func (p *Panel) refresh() {
 		if changed {
 			p.items = append(pl.Assets(), extras...)
 			p.addCells()
+			p.stacks = nil
 			p.prune()
 		}
 	}

editor/panels/assets/tiles.go

@@ -171,7 +171,7 @@ func (p *Panel) stack(dir string) []int {
 	var out []int
 	for i := range p.items {
 		it := &p.items[i]
-		if path.Dir(it.Path) != dir || it.Kind == asset.ArtScript || it.Kind == asset.ArtData || it.Kind == asset.ArtTable {
+		if path.Dir(it.Path) != dir || p.isCell(it.ID) {
 			continue
 		}
 		out = append(out, i)
@@ -212,12 +212,16 @@ func (p *Panel) wave(a *pipeline.AssetInfo, r mathx.Rect) bool {
 	return true
 }
 
-// folderStack draws up to three previews as sheets sticking out of the folder icon.
+// folderStack draws scalable folder shapes and up to three sheets of contents.
 func (p *Panel) folderStack(dir string, img mathx.Rect) {
 	ui := p.f.UI
 	th := &ui.Theme
 	icon := img.W * 0.82
 	at := mathx.Rect{X: img.X + (img.W-icon)/2, Y: img.Y + (img.H-icon)/2 + icon*0.06, W: icon, H: icon}
+	back := th.Accent
+	back.R, back.G, back.B = back.R*0.7, back.G*0.7, back.B*0.7
+	ui.RoundRect(mathx.Rect{X: at.X + icon*0.07, Y: at.Y + icon*0.12, W: icon * 0.36, H: icon * 0.22}, icon*0.035, back)
+	ui.RoundRect(mathx.Rect{X: at.X + icon*0.07, Y: at.Y + icon*0.22, W: icon * 0.86, H: icon * 0.64}, icon*0.035, back)
 	list := p.stack(dir)
 	n := min(len(list), 3)
 	if img.W < 40 {
@@ -230,15 +234,29 @@ func (p *Panel) folderStack(dir string, img mathx.Rect) {
 		it := &p.items[list[k]]
 		lift := float32(k%2) * icon * 0.06
 		cr := mathx.Rect{X: x0 + float32(k)*step, Y: at.Y + icon*0.02 - lift, W: cs, H: cs}
-		ui.Rect(cr, th.CardBg)
+		fill, border := folderSheetColors(th)
-		in := mathx.Rect{X: cr.X + 2, Y: cr.Y + 2, W: cr.W - 4, H: cr.H * 0.42}
+		ui.Rect(cr, fill)
+		// The front of the folder covers the lower part of each sheet. Use
+		// the visible portion for the preview instead of a thin strip.
+		in := mathx.Rect{X: cr.X + 2, Y: cr.Y + 2, W: cr.W - 4, H: max(1, cr.H*0.72-2)}
 		if !p.thumb(it, in) {
 			ic := cs * 0.4
 			widgets.IconAt(ui, mathx.Rect{X: cr.X + (cs-ic)/2, Y: cr.Y + 2, W: ic, H: ic}, kindIcon(it.Kind), p.kindColor(it.Kind))
 		}
-		ui.Outline(cr, th.Border)
+		ui.Outline(cr, border)
 	}
-	widgets.IconAt(ui, at, "file.folder", th.Accent)
+	front := mathx.Rect{X: at.X + icon*0.07, Y: at.Y + icon*0.43, W: icon * 0.86, H: icon * 0.43}
+	ui.RoundRect(front, icon*0.035, th.Accent)
+	ui.Rect(mathx.Rect{X: front.X, Y: front.Y, W: front.W, H: max(1, icon*0.025)}, back)
+}
+
+func folderSheetColors(th *core.Theme) (mathx.Color, mathx.Color) {
+	if th.Dark {
+		return th.CardBg, th.Border
+	}
+	border := th.TextDim
+	border.A = 0.55
+	return th.WidgetDown, border
 }
 
 func (p *Panel) code(lines []string, r mathx.Rect) {

editor/panels/assets/tiles_test.go

@@ -3,7 +3,11 @@ package assets
 import (
 	"testing"
 
+	"aego/asset"
+	"aego/asset/pipeline"
+	"aego/core/ids"
 	"aego/editor/core/code/highlight"
+	"aego/ui/theme"
 )
 
 func TestDeclName(t *testing.T) {
@@ -26,3 +30,31 @@ func TestDeclName(t *testing.T) {
 		}
 	}
 }
+
+func TestLightFolderSheetsContrastWithPanel(t *testing.T) {
+	light, dark := theme.Light(), theme.Editor()
+	fill, border := folderSheetColors(&light)
+	if theme.Contrast(fill, light.Panel) < 1.2 || theme.Contrast(border, fill) < 1.5 {
+		t.Fatal("light folder sheets must be distinguishable from the panel and each other")
+	}
+	fill, border = folderSheetColors(&dark)
+	if fill != dark.CardBg || border != dark.Border {
+		t.Fatal("dark folder sheet colors changed")
+	}
+}
+
+func TestFolderStackIncludesScriptsAndData(t *testing.T) {
+	p := New(Deps{})
+	p.items = []pipeline.AssetInfo{
+		{ID: ids.AssetID{Lo: 1}, Path: "scripts/player/player.aes", Kind: asset.ArtScript},
+		{ID: ids.AssetID{Lo: 2}, Path: "scripts/other.aes", Kind: asset.ArtScript},
+		{ID: ids.AssetID{Lo: 3}, Path: "assets/data/settings.aedata", Kind: asset.ArtData},
+		{ID: ids.AssetID{Lo: 4}, Path: "assets/data/values.aetable", Kind: asset.ArtTable},
+	}
+	if got := p.stack("scripts/player"); len(got) != 1 || got[0] != 0 {
+		t.Fatalf("script previews = %v", got)
+	}
+	if got := p.stack("assets/data"); len(got) != 2 || got[0] != 2 || got[1] != 3 {
+		t.Fatalf("data previews = %v", got)
+	}
+}