fix(lint): resolve ESLint errors breaking CI validate

- markdownPlugins.ts: use dot notation for abbr attribute access
- useResizablePanel.ts: wrap ref.current assignments in useEffect
  to comply with react-hooks/refs rule

src/renderer/hooks/useResizablePanel.ts

@@ -50,16 +50,16 @@ export function useResizablePanel({
 
   // Keep callbacks in refs to avoid stale closures in mousemove listener
   const onWidthChangeRef = useRef(onWidthChange);
-  onWidthChangeRef.current = onWidthChange;
-
   const minWidthRef = useRef(minWidth);
-  minWidthRef.current = minWidth;
-
   const maxWidthRef = useRef(maxWidth);
-  maxWidthRef.current = maxWidth;
-
   const sideRef = useRef(side);
-  sideRef.current = side;
+
+  useEffect(() => {
+    onWidthChangeRef.current = onWidthChange;
+    minWidthRef.current = minWidth;
+    maxWidthRef.current = maxWidth;
+    sideRef.current = side;
+  });
 
   const handleMouseMove = useCallback(
     (e: MouseEvent) => {

src/renderer/utils/markdownPlugins.ts

@@ -37,7 +37,7 @@ const sanitizeSchema: SanitizeSchema = {
   attributes: {
     ...defaultSchema.attributes,
     // Allow title on abbr (for tooltip definitions)
-    abbr: [...(defaultSchema.attributes?.['abbr'] ?? []), 'title'],
+    abbr: [...(defaultSchema.attributes?.abbr ?? []), 'title'],
   },
 };