sync: Redis caching for browse/skill API, progress bar on search, default sort by stars

- Add Redis caching to browse search results and skill detail API
- Show progress bar on homepage search
- Default sort to stars

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

apps/web/components/ProgressBar.tsx

@@ -121,12 +121,19 @@ export function ProgressBar() {
     const handlePopState = () => onUrlChange();
     window.addEventListener('popstate', handlePopState);
 
+    // 4. Custom event for programmatic navigation (e.g. form submits with router.push)
+    const handleManualStart = () => {
+      if (!isRunningRef.current) start();
+    };
+    window.addEventListener('progressbar:start', handleManualStart);
+
     return () => {
       clearTimers();
       document.removeEventListener('click', handleClick, true);
       history.pushState = origPushState;
       history.replaceState = origReplaceState;
       window.removeEventListener('popstate', handlePopState);
+      window.removeEventListener('progressbar:start', handleManualStart);
     };
   }, []);