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_layer_rows.py

@@ -0,0 +1,36 @@
+"""Mobile layer-row layout: compact rows + single-line active action strip.
+
+At phone widths the layers sheet gave every idle row a 102px height (a reserved
+empty grid track) and wrapped the active row's action strip onto a second line,
+where it overflowed onto the next layer. These tests pin the CSS fixes.
+"""
+
+from pathlib import Path
+
+ROOT = Path(__file__).resolve().parents[1]
+CSS = (ROOT / "static" / "css" / "13-image-editor.css").read_text()
+SW = (ROOT / "static" / "sw.js").read_text()
+
+
+def test_mobile_layer_rows_use_two_tracks():
+    # Both the layer-item and group-row rules drop the reserved third track.
+    assert CSS.count("grid-template-rows: 44px auto;") >= 2
+    assert "grid-template-rows: 40px auto 40px;" not in CSS
+
+
+def test_active_action_strip_does_not_wrap():
+    marker = (
+        ".ge-right-panel .ge-layers-list > .ge-layer-item"
+        ":not(.ge-adj-sub-item):not(.ge-mask-sub-item).active > .ge-layer-controls"
+    )
+    assert marker in CSS
+    idx = CSS.index(marker)
+    block = CSS[idx : idx + 400]
+    assert "flex-wrap: nowrap;" in block
+    assert "overflow-x: auto;" in block
+
+
+def test_sw_cache_bumped():
+    # Version-agnostic: every commit bumps the SW cache.
+    import re
+    assert re.search(r"CACHE_NAME = 'odysseus-v\d+-pr40-editor-precache'", SW)