fix(api-tokens): clear the table filter when opening the create row

The inline "Create Token" row is a data row prepended at index 0, so an active
table filter (globalFilterFn) or a non-first page hid it — clicking Create Token
appeared to do nothing. handleCreateNew now calls setFilter(''), which clears the
filter and resets pageIndex to 0 (clearPageOnFilterChange default), so the create
row is always visible.

Live-verified (docker/HEAD backend): with a non-matching filter, Create Token now
shows the create row and clears the filter.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

frontend/src/pages/settings/settings-api-tokens.tsx

@@ -371,7 +371,10 @@ function SettingsAPITokens() {
     const handleCreateNew = useCallback(() => {
         setCreatingToken(true);
         createForm.reset(CREATE_TOKEN_DEFAULTS);
-    }, [createForm]);
+        // The create row is prepended at data index 0, so an active filter or a non-first
+        // page would hide it. Clearing the filter also resets pageIndex to 0.
+        setFilter('');
+    }, [createForm, setFilter]);
 
     const handleCancelCreate = useCallback(() => {
         setCreatingToken(false);