feat(photo-editor): Ajax Image Editor client (Photoshop-parity tools)

Photoshop-parity editor client: layers, selection/masking, brushes,
smart filters, LUT import, Quick Edit, mobile gestures, workspaces,
batch operations, and the service-worker versioning (v978->v1006).

Source: vendor/photocraft (ad1cff44) photo-editor client files, merged
onto upstream/dev (a8c147b2). Conflict resolution documented in
pr_work/A_conflicts.md; editor files taken from vendor/photocraft
(upstream's editor is an earlier snapshot of the same feature).

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

tests/test_editor_transform_perspective_js.py

@@ -0,0 +1,52 @@
+from pathlib import Path
+
+ROOT = Path(__file__).resolve().parents[1]
+
+
+def read(rel):
+    return (ROOT / rel).read_text(encoding="utf-8")
+
+
+STATE = read("static/js/editor/state.js")
+POPUP = read("static/js/editor/build/transform-popup.js")
+SESSION = read("static/js/editor/tools/transform-session.js")
+MULTI = read("static/js/editor/multi-transform.js")
+WARP = read("static/js/editor/perspective-warp.js")
+SW = read("static/sw.js")
+
+
+def test_perspective_module_shape():
+    assert "export function keystoneCorners(" in WARP
+    assert "export function warpRgba(" in WARP
+    assert "export function perspectiveWarpCanvas(" in WARP
+    assert "export function isPerspectiveActive(" in WARP
+
+
+def test_state_has_perspective_fields():
+    assert "transformPendingPerspX: 0" in STATE
+    assert "transformPendingPerspY: 0" in STATE
+
+
+def test_popup_exposes_perspective_fields():
+    assert 'id="ge-transform-persp-x"' in POPUP
+    assert 'id="ge-transform-persp-y"' in POPUP
+    assert 'data-spin-for="ge-transform-persp-x"' in POPUP
+    assert 'data-spin-for="ge-transform-persp-y"' in POPUP
+
+
+def test_session_threads_perspective_through_transform():
+    assert "from '../perspective-warp.js'" in SESSION
+    assert "isPerspectiveActive" in SESSION
+    assert "keystoneCorners" in SESSION
+    assert "perspectiveWarpCanvas" in SESSION
+    assert "'#ge-transform-persp-x': state.transformPendingPerspX" in SESSION
+    assert "'#ge-transform-persp-y': state.transformPendingPerspY" in SESSION
+    assert "perspectiveX: state.transformPendingPerspX" in SESSION
+    assert "state.transformPendingPerspX = target.perspectiveX" in SESSION
+    assert "const perspectiveX = target" in MULTI
+    assert "perspectiveX," in MULTI
+    assert "target?.perspectiveX ?? 0" in MULTI
+
+
+def test_perspective_module_is_precached():
+    assert "/static/js/editor/perspective-warp.js" in SW