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_shape_boolean_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")
+
+
+BOOLEAN = read("static/js/editor/shape-boolean.js")
+TOPBAR = read("static/js/editor/build/topbar.js")
+WIRE = read("static/js/editor/wire-extra-menus.js")
+GALLERY = read("static/js/galleryEditor.js")
+SW = read("static/sw.js")
+
+
+def test_boolean_module_exports_ops():
+    assert "export function combineLayers(" in BOOLEAN
+    assert "SHAPE_BOOLEAN_OPS" in BOOLEAN
+    for op in ("'unite'", "'subtract'", "'intersect'", "'exclude'"):
+        assert op in BOOLEAN
+    assert "destination-out" in BOOLEAN
+    assert "destination-in" in BOOLEAN
+
+
+def test_topbar_layer_menu_exposes_combine_actions():
+    for action in (
+        'data-layer-action="combine-unite"',
+        'data-layer-action="combine-subtract"',
+        'data-layer-action="combine-intersect"',
+        'data-layer-action="combine-exclude"',
+    ):
+        assert action in TOPBAR
+
+
+def test_wire_dispatches_combine_actions():
+    assert "combineShapes" in WIRE
+    assert "combineShapes?.('unite')" in WIRE
+    assert "combineShapes?.('subtract')" in WIRE
+    assert "combineShapes?.('intersect')" in WIRE
+    assert "combineShapes?.('exclude')" in WIRE
+
+
+def test_gallery_implements_combine_shapes():
+    assert "from './editor/shape-boolean.js';" in GALLERY
+    assert "_combineSelectedShapes" in GALLERY
+    assert "combineShapes: (op) => _combineSelectedShapes(op)" in GALLERY
+    assert "_combineLayers(" in GALLERY
+
+
+def test_boolean_module_is_precached():
+    assert "/static/js/editor/shape-boolean.js" in SW