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_mobile_panels.py

@@ -0,0 +1,28 @@
+import re
+from pathlib import Path
+
+ROOT = Path(__file__).resolve().parents[1]
+RIGHT_PANEL = (ROOT / "static" / "js" / "editor" / "build" / "right-panel.js").read_text()
+CSS = (ROOT / "static" / "css" / "13-image-editor.css").read_text()
+SW = (ROOT / "static" / "sw.js").read_text()
+
+
+def test_mobile_panel_overlay_mounted():
+    assert "'ge-mobile-panels'" in RIGHT_PANEL
+    assert "compact: true" in RIGHT_PANEL
+    assert "ge-layers-panels-btn" in RIGHT_PANEL
+    assert "overlay.hidden = !overlay.hidden;" in RIGHT_PANEL
+
+
+def test_mobile_panel_overlay_is_phone_scoped():
+    # Asserted against the whole stylesheet: the file now has several
+    # `@media (max-width: 700px)` blocks, so index-based scoping is brittle.
+    assert "@media (max-width: 700px)" in CSS
+    assert ".ge-mobile-panels {" in CSS
+    assert ".ge-layers-panels-btn {" in CSS
+    assert ".ge-mobile-panels .ge-dock-select {" in CSS
+
+
+def test_sw_cache_bumped():
+    m = re.search(r"CACHE_NAME = '(odysseus-v\d+-pr40-editor-precache)'", SW)
+    assert m, "CACHE_NAME not found"