feat(photo-editor): NL editor planner, image ops, email/gallery server

Server-side photo editor: natural-language editor agent route
(/api/editor/agent), photo_editor tool family + style guide, image-op
provider proxy with progress, email server hardening, gallery/hwfit
routes, and graceful shutdown.

Source: vendor/photocraft (ad1cff44) editor-server files, merged onto
upstream/dev (a8c147b2). Conflict resolution documented in
pr_work/B_conflicts.md.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

tests/test_gallery_landing_import_button.py

@@ -0,0 +1,25 @@
+from pathlib import Path
+
+
+ROOT = Path(__file__).resolve().parents[1]
+GALLERY = ROOT / "static/js/gallery.js"
+
+
+def test_editor_landing_has_an_import_button_next_to_new_canvas():
+    """The editor landing must offer a direct "Import" action.
+
+    It sits in the same action row as "New canvas..." / "Browse gallery" and,
+    on file pick, opens the editor on the chosen raster image (``openEditor``
+    takes an image data URL as its first argument).
+    """
+    src = GALLERY.read_text(encoding="utf-8")
+    assert 'id="gallery-editor-import"' in src, "landing Import button missing"
+    # Button order: New canvas → Import → Browse gallery.
+    new_at = src.index('id="gallery-editor-new"')
+    import_at = src.index('id="gallery-editor-import"')
+    pick_at = src.index('id="gallery-editor-pick"')
+    assert new_at < import_at < pick_at, "Import must sit next to New canvas"
+    # Wiring opens the editor on the selected file's data URL.
+    assert "getElementById('gallery-editor-import')?.addEventListener('click'" in src
+    assert "readAsDataURL(file)" in src
+    assert "await openEditor(reader.result, null, null, name)" in src