fix(tags): case-insensitive kind prefix + (Fandom) suffix rescue on add

parse_kind_prefix now lowercases the prefix before checking KNOWN_KINDS,
matching the modal JS which already lowercases before its visibility
check. Without this, typing 'Character:Jinx ...' showed the fandom
picker but the server fell back to kind=user.

Both /tags/add and /api/images/bulk-add-tag now also split a trailing
'(Fandom)' suffix from a typed character name when no explicit fandom
is staged, so a manual entry like 'Character:Jinx (League Of Legends)'
produces a clean (name='Jinx', fandom_id=<league>) row instead of a
malformed character with the suffix baked into the name.

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

app/main.py

@@ -1189,6 +1189,17 @@ def add_tag(image_id):
             fandom_id = request.form.get("fandom_id", type=int)
             fandom_name = (request.form.get("fandom_name") or "").strip() or None
 
+            # If the user typed the name with a "(Fandom)" suffix and didn't
+            # use the fandom picker, split the suffix into a real fandom
+            # association so we don't create a malformed character row with
+            # the suffix baked into the name and fandom_id=NULL.
+            import re as _re
+            if not fandom_id and not fandom_name:
+                m = _re.match(r'^(.+?) \(([^()]+)\)$', name)
+                if m:
+                    name = m.group(1).strip()
+                    fandom_name = m.group(2).strip()
+
             if fandom_id:
                 fandom_tag = Tag.query.filter_by(id=fandom_id, kind="fandom").first()
                 if fandom_tag is None:
@@ -2615,6 +2626,17 @@ def bulk_add_tag():
     if kind == "character":
         fandom_id = data.get("fandom_id")
         fandom_name = (data.get("fandom_name") or "").strip() or None
+
+        # Same suffix-rescue as /tags/add: typed "Jinx (League Of Legends)"
+        # without an explicit fandom should still produce a clean character
+        # row with a real fandom_id, not a malformed name.
+        import re as _re
+        if not fandom_id and not fandom_name:
+            m = _re.match(r'^(.+?) \(([^()]+)\)$', name)
+            if m:
+                name = m.group(1).strip()
+                fandom_name = m.group(2).strip()
+
         if fandom_id:
             fandom_tag = Tag.query.filter_by(id=fandom_id, kind="fandom").first()
             if fandom_tag is None: