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_footer_sheet.py

@@ -0,0 +1,46 @@
+"""Mobile editor footer must float above the layers bottom-sheet.
+
+On phones the layers panel is a bottom sheet that would cover the editor
+footer (zoom / Setup / AI settings). galleryEditor floats that footer just
+above the sheet's top edge so its controls stay tappable, and clears it again
+on desktop or when the sheet is collapsed.
+"""
+import pathlib
+
+ROOT = pathlib.Path(__file__).resolve().parents[1]
+GE = (ROOT / "static" / "js" / "galleryEditor.js").read_text(encoding="utf-8")
+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_footer_placer_exists_and_is_mobile_scoped():
+    assert "const _placeMobileFooter = () => {" in GE
+    assert "footer.classList.add('ge-footer-floating')" in GE
+    assert "window.innerWidth > 700" in GE
+    assert "document.querySelector('.ge-right-panel')" in GE
+    # placed flush above the sheet top edge (no seam / dead space)
+    assert "Math.round(vh - r.top)" in GE
+
+
+def test_footer_watcher_reacts_to_sheet_resize():
+    assert "const _syncMobileChrome" in GE
+    assert "_liftQuickEdit(); _placeMobileFooter();" in GE
+    assert "new ResizeObserver(_settleMobileChrome)" in GE
+    assert "new MutationObserver(_settleMobileChrome)" in GE
+    assert "window.addEventListener('resize', _syncMobileChrome)" in GE
+
+
+def test_floating_footer_css_is_mobile_only():
+    assert ".ge-editor-footer.ge-footer-floating {" in CSS
+    marker = ".ge-editor-footer.ge-footer-floating {"
+    idx = CSS.index(marker)
+    # the rule must live inside the max-width:700px mobile block that also
+    # tightens the footer
+    assert "@media (max-width: 700px)" in CSS[:idx]
+
+
+def test_sw_cache_bumped():
+    # Version-agnostic: every commit bumps the SW cache, so pinning the exact
+    # number makes this test fail on the next commit.
+    import re
+    assert re.search(r"CACHE_NAME = 'odysseus-v\d+-pr40-editor-precache'", SW)