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_adj_popup_close.py

@@ -0,0 +1,29 @@
+import re
+from pathlib import Path
+
+ROOT = Path(__file__).resolve().parents[1]
+ADJ = (ROOT / "static/js/editor/fx/adj-popup.js").read_text(encoding="utf-8")
+SW = (ROOT / "static/sw.js").read_text(encoding="utf-8")
+
+
+def test_adjustment_popup_head_uses_a_close_button():
+    # The head control is an explicit close (x), not a minimise affordance that
+    # did not behave like a minimise.
+    assert '<button class="ge-adj-close" type="button" title="Close" aria-label="Close">&times;</button>' in ADJ
+
+
+def test_head_no_longer_renders_a_minimise_button():
+    assert 'class="ge-adj-min"' not in ADJ
+    assert 'title="Minimise"' not in ADJ
+    assert "&minus;" not in ADJ
+
+
+def test_close_button_is_wired_to_close_adj_popup():
+    assert "pop.querySelector('.ge-adj-close')?.addEventListener('click', closeAdjPopup);" in ADJ
+    assert "pop.querySelector('.ge-adj-min')" not in ADJ
+
+
+def test_sw_cache_name_is_version_agnostic():
+    m = re.search(r"CACHE_NAME = '(odysseus-v\d+-pr40-editor-precache)'", SW)
+    assert m, "sw.js CACHE_NAME not found"
+    assert re.fullmatch(r"odysseus-v\d+-pr40-editor-precache", m.group(1))