Round 19: Fix auth 500/session persistence, script tag warning, module factory error, rate limiting

- Fix auth session persistence: set cookie on both cookies() and NextResponse
- Fix isSecureRequest: check x-forwarded-proto for HTTPS proxy support
- Fix excessive GET /api/auth polling: add useRef guard to prevent duplicate checks
- Increase rate limits: auth POST 30/min, auth GET 120/min
- Fix script tag warning: use ref-based textContent instead of dangerouslySetInnerHTML in chart.tsx
- Fix sanitizeHtml: improve regex patterns for script tag removal
- Fix module factory error: disable SW registration in dev, skip /_next/ caching in sw.js
- Bump SW cache version v2→v3 to force cache invalidation
- Better error handling in auth route with specific error messages

src/components/offline-indicator.tsx

@@ -179,6 +179,9 @@ export function useServiceWorker() {
   useEffect(() => {
     if (typeof window === 'undefined') return;
     if (!('serviceWorker' in navigator)) return;
+    // Skip service worker registration during development to avoid stale
+    // Turbopack chunk caching ("module factory is not available" errors)
+    if (process.env.NODE_ENV === 'development') return;
 
     async function registerSW() {
       try {

src/components/ui/chart.tsx

@@ -78,12 +78,9 @@ const ChartStyle = ({ id, config }: { id: string; config: ChartConfig }) => {
     return null
   }
 
-  return (
-    <style
-      dangerouslySetInnerHTML={{
-        __html: Object.entries(THEMES)
-          .map(
-            ([theme, prefix]) => `
+  const cssText = Object.entries(THEMES)
+    .map(
+      ([theme, prefix]) => `
 ${prefix} [data-chart=${id}] {
 ${colorConfig
   .map(([key, itemConfig]) => {
@@ -95,11 +92,12 @@ ${colorConfig
   .join("\n")}
 }
 `
-          )
-          .join("\n"),
-      }}
-    />
-  )
+    )
+    .join("\n")
+
+  // Use ref to set textContent instead of dangerouslySetInnerHTML to avoid
+  // React 19 "Encountered a script tag" warning for style elements
+  return <style ref={(el) => { if (el) el.textContent = cssText }} />
 }
 
 const ChartTooltip = RechartsPrimitive.Tooltip