fix: resolve 25 error-level lint issues (P1-3)

Fix no-require-imports, no-explicit-any, no-html-link-for-pages,
set-state-in-effect, purity, static-components, and refs rules
across 15 files. 0 errors remain (52 warnings unchanged).

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

src/components/chat/StreamingMessage.tsx

@@ -47,9 +47,10 @@ interface StreamingMessageProps {
 
 function ElapsedTimer() {
   const [elapsed, setElapsed] = useState(0);
-  const startRef = useRef(Date.now());
+  const startRef = useRef(0);
 
   useEffect(() => {
+    startRef.current = Date.now();
     const interval = setInterval(() => {
       setElapsed(Math.floor((Date.now() - startRef.current) / 1000));
     }, 1000);