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_adjustments.py

@@ -0,0 +1,48 @@
+from pathlib import Path
+
+
+ROOT = Path(__file__).resolve().parents[1]
+EDITOR = ROOT / "static/js/galleryEditor.js"
+PIXEL_PASS = ROOT / "static/js/editor/fx/pixel-pass.js"
+
+
+def test_desaturate_is_a_deterministic_local_op():
+    src = EDITOR.read_text(encoding="utf-8")
+    # Desaturate/Cmd+Shift+U is handled on the client, not sent to the model.
+    assert r"\bde-?satur\w*" in src
+    assert r"\b(?:remove|strip|drop|take\s+out)\s+(?:all\s+|the\s+)?colou?rs?\b(?!\s*cast)" in src
+    assert "await _runQuickControlOp('adjustments.apply', { type: 'hue-saturation', params: { saturation: 0 } });" in src
+    assert "'Desaturated the photo.'" in src
+
+
+def test_auto_tone_levels_colour_use_the_autotone_op():
+    src = EDITOR.read_text(encoding="utf-8")
+    assert r"\bauto[-\s]?tone\b|\bauto[-\s]?levels?\b|\bauto[-\s]?colou?rs?\b" in src
+    assert "await _runQuickControlOp('photo.autoTone', {});" in src
+    # The op is registered in the editor control registry.
+    assert "'photo.autoTone':" in src
+    assert "auto tone/colour" in src
+
+
+def test_auto_contrast_uses_the_levels_endpoint_stretch():
+    src = EDITOR.read_text(encoding="utf-8")
+    assert r"\bauto[-\s]?contrast\b" in src
+    assert "await _runQuickControlOp('adjustments.apply', { type: 'levels', params: { inBlack: 12, inWhite: 243 } });" in src
+    assert "'Added auto contrast.'" in src
+
+
+def test_branches_run_before_the_generative_blur_branch():
+    src = EDITOR.read_text(encoding="utf-8")
+    # Guard rail: deterministic adjustments must be matched before the blur /
+    # generative fall-throughs, otherwise "remove the colour" would leak to the
+    # image model.
+    desat = src.index("params: { saturation: 0 }")
+    blur = src.index("depth\\s*of\\s*field")
+    assert desat < blur
+
+
+def test_hue_saturation_saturation_is_a_multiplier():
+    # The desaturate branch passes saturation: 0, which is only correct because
+    # the pixel pass treats saturation as a multiplier (1 = neutral).
+    src = PIXEL_PASS.read_text(encoding="utf-8")
+    assert "const saturationScale = Math.max(0, finiteOr(p.saturation, 1));" in src