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_dock_history_glyph.py

@@ -0,0 +1,31 @@
+import re
+from pathlib import Path
+
+ROOT = Path(__file__).resolve().parents[1]
+CSS = (ROOT / "static/css/13-image-editor.css").read_text(encoding="utf-8")
+SW = (ROOT / "static/sw.js").read_text(encoding="utf-8")
+
+
+def test_tab_undock_glyph_is_hover_and_keyboard_only():
+    # The per-tab undock glyph must not persist on a merely-clicked (focused) tab.
+    assert ".ge-dock-tab:focus-visible ~ .ge-dock-tab-pop" in CSS
+    assert ":focus-within .ge-dock-tab-pop" not in CSS
+
+
+def test_group_undock_has_divider_and_margin():
+    start = CSS.index(".ge-dock-detach {")
+    block = CSS[start : start + 400]
+    assert "margin-left: 2px;" in block
+    assert "border-left: 1px solid" in block
+
+
+def test_docked_history_has_no_open_in_window_button():
+    panels = (ROOT / "static/js/editor/panels/studio-panels.js").read_text(encoding="utf-8")
+    assert "ge-history-popout" not in panels
+    assert "Open in window" not in panels
+
+
+def test_sw_cache_name_versions():
+    m = re.search(r"CACHE_NAME = '([^']+)'", SW)
+    assert m is not None
+    assert re.fullmatch(r"odysseus-v\d+-pr40-editor-precache", m.group(1))