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_canvas_navigation_js.py

@@ -97,8 +97,9 @@ def test_hand_navigation_is_wired_to_toolbar_keyboard_and_offline_graph():
     editor = (ROOT / "static/js/galleryEditor.js").read_text(encoding="utf-8")
     service_worker = (ROOT / "static/sw.js").read_text(encoding="utf-8")
 
-    assert "{ id: 'hand', label: 'Hand'" in toolbar
-    assert "t.key = TOOL_SHORTCUTS[t.id]" in toolbar
+    assert "hand: { label: 'Hand'" in toolbar
+    assert "const key = TOOL_SHORTCUTS[id]" in toolbar
+    assert "toolKeyMap[key.toLowerCase()] = id" in toolbar
     assert "hand: 'H'" in shortcuts
     assert "e.code === 'Space'" in keyboard
     assert "setTemporaryPan?.(true)" in keyboard