fix(suggestions): pill × removal also suppresses re-auto-accept

The previous fix only covered the suggestion-chip ✕ flow (which calls
/suggestions/reject). Removing a tag via the pill × in the Tags section
goes through /tags/remove and wrote no feedback row, so the per-image
rejection filter in get_suggestions had nothing to match on — auto-accept
would re-apply the tag on the next modal load.

/tags/remove now writes SuggestionFeedback(decision='rejected',
suggestion_source='manual_removal', confidence=0) alongside the image_tags
delete. The suggestion_source value distinguishes these rows from
chip-reject rejections in the feedback log without complicating the
get_suggestions filter (it matches on decision alone).

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

app/main.py

@@ -1211,14 +1211,28 @@ def add_tag(image_id):
 
 @main.post("/image/<int:image_id>/tags/remove")
 def remove_tag(image_id):
+    """Remove a tag from an image.
+
+    Also logs a SuggestionFeedback rejection so the auto-suggest + auto-accept
+    systems treat this as 'the user said no to this tag for this image'.
+    Without the rejection row, a removed tag whose WD14 prediction still sits
+    at/above the auto-accept threshold would re-apply itself on the next
+    modal load.
     """
-    Minimal JSON endpoint to remove a tag from an image.
-    """
+    from app.models import SuggestionFeedback
+
     name = (request.form.get("name") or "").strip()
     img = ImageRecord.query.get_or_404(image_id)
     tag = Tag.query.filter_by(name=name).first()
     if tag and tag in img.tags:
         img.tags.remove(tag)
+        db.session.add(SuggestionFeedback(
+            image_id=image_id,
+            tag_name=name,
+            suggestion_source='manual_removal',
+            confidence=0.0,
+            decision='rejected',
+        ))
         db.session.commit()
     return jsonify(ok=True)