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_quick_edit_image_mode.py

@@ -0,0 +1,32 @@
+import re
+from pathlib import Path
+
+ROOT = Path(__file__).resolve().parents[1]
+JS = (ROOT / "static" / "js" / "galleryEditor.js").read_text()
+ROUTES = (ROOT / "routes" / "gallery" / "gallery_routes.py").read_text()
+SW = (ROOT / "static" / "sw.js").read_text()
+
+
+def test_client_image_mode_generates():
+    assert "if (mode === 'image')" in JS
+    assert "_runQuickControlOp('ai.generateImage'" in JS
+    assert "Generating an image…" in JS
+    assert "Generated an image." in JS
+    assert "Could not generate an image:" in JS
+
+
+def test_client_image_mode_runs_after_harmonize():
+    harm = JS.index("_isHarmonizeIntent(prompt))")
+    img = JS.index("if (mode === 'image')")
+    assert harm < img
+
+
+def test_server_generate_route_exists():
+    assert '@router.post("/api/image/generate")' in ROUTES
+    assert "do_generate_image" in ROUTES
+    assert "can_generate_images" in ROUTES.split('@router.post("/api/image/generate")', 1)[1][:1200]
+
+
+def test_sw_cache_bumped():
+    m = re.search(r"CACHE_NAME = '(odysseus-v\d+-pr40-editor-precache)'", SW)
+    assert m and re.fullmatch(r"odysseus-v\d+-pr40-editor-precache", m.group(1))