fix(editor): use void for reactive dependency tracking in FindReplaceWidget (#341)

Replace unused variable pattern with void expression to suppress TS6133 error
while maintaining SolidJS reactive dependency tracking.

Co-authored-by: Droid Agent <droid@factory.ai>

Author: echobt

cortex-gui/src/components/editor/FindReplaceWidget.tsx

@@ -879,8 +879,7 @@ export function FindReplaceWidget(props: FindReplaceWidgetProps) {
   // Effects
   createEffect(() => {
     // Re-search when options change (access state to create reactive dependency)
-    // eslint-disable-next-line @typescript-eslint/no-unused-vars
-    const _state = findState();
+    void findState();
     performSearch();
   });