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_tool_rail_ellipsis.py

@@ -0,0 +1,23 @@
+"""Marker test: the mobile tool-rail overflow control shows an ellipsis.
+
+EVAL flagged the '<' '>' chevron; it should match the dock overflow control
+(an ellipsis '...').
+"""
+
+from pathlib import Path
+import re
+
+ROOT = Path(__file__).resolve().parents[1]
+EDITOR = (ROOT / "static/js/galleryEditor.js").read_text()
+SW = (ROOT / "static/sw.js").read_text()
+
+
+def test_tool_rail_more_is_an_ellipsis():
+    assert "toolbarMore.textContent = '\\u2026';" in EDITOR
+    assert "toolbarMore.textContent = '\\u203A';" not in EDITOR
+
+
+def test_sw_version_is_current():
+    m = re.search(r"const CACHE_NAME = '([^']+)'", SW)
+    assert m, "CACHE_NAME not found"
+    assert re.fullmatch(r"odysseus-v\d+-pr40-editor-precache", m.group(1)), m.group(1)