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_layer_opacity.py

@@ -0,0 +1,34 @@
+"""Quick Edit sets a layer's opacity (Photoshop Layers-panel Opacity field).
+
+"Set the layer opacity to 50%" previously fell through the command box to the
+keyword planner, which had no intent for it, so nothing happened. It now routes
+deterministically to the `layers.setOpacity` op.
+"""
+from pathlib import Path
+
+ROOT = Path(__file__).resolve().parents[1]
+EDITOR = (ROOT / "static" / "js" / "galleryEditor.js").read_text(encoding="utf-8")
+SERVER = (ROOT / "routes" / "editor_agent_routes.py").read_text(encoding="utf-8")
+COVERAGE = (ROOT / "docs" / "QUICKEDIT_COVERAGE.md").read_text(encoding="utf-8")
+
+
+def test_opacity_routing_present():
+    assert "// --- Layer ▸ Opacity (Photoshop Layers-panel Opacity field, deterministic) ---" in EDITOR
+    assert "await _runQuickControlOp('layers.setOpacity', { opacity: _val });" in EDITOR
+    assert "const _opWord = /\\b(?:opacity|opaque|transparen(?:t|cy))\\b/.test(p);" in EDITOR
+
+
+def test_opacity_routing_precedes_layer_management():
+    routing = EDITOR.index("await _runQuickControlOp('layers.setOpacity', { opacity: _val });")
+    assert routing < EDITOR.index("// --- Layer management commands ---")
+
+
+def test_setopacity_op_in_both_catalogs():
+    assert "'layers.setOpacity':" in EDITOR
+    assert '"layers.setOpacity"' in SERVER
+
+
+def test_coverage_doc_marks_layer_opacity_ok():
+    row = next(line for line in COVERAGE.splitlines() if "Layer → Opacity" in line)
+    assert "OK" in row
+    assert "fast path" in row