SIWE auth, API proxy fixes, dashboard, login, usage pages

- SIWE auth flow: challenge/login/logout/me API routes + JWT middleware
- Fixed [...path] catch-all: Kubo proxy with matchRoute() + mapToKuboAPI()
- Fixed session_id → nonce field mismatch in AuthProvider
- Fixed dashboard pins crash: Kubo returns {Keys: {...}}, not array
- Added middleware route guard (307 redirect to /login)
- Added login, register, profile, usage, upload pages
- Added dashboard components (StorageGauge, FreeTierProgress)
- Added SWR hooks + AuthGuard + Providers + Toast/ErrorBoundary
- Added payment integration (smart contract ABI, tiers, tokens)
- Fixed IPNS key listing: Name/Id → name/id mapping
- Added PWA support (manifest, service worker, icons)
- Added tests for helpers, limits, search-index, wallet

src/components/SWRegister.tsx

@@ -0,0 +1,19 @@
+'use client';
+
+/* ════════════════════════════ SWRegister ════════════════════════════
+ * Registreert de service worker voor PWA offline support.
+ */
+
+import { useEffect } from 'react';
+
+export default function SWRegister() {
+  useEffect(() => {
+    if ('serviceWorker' in navigator) {
+      navigator.serviceWorker.register('/sw.js').catch(() => {
+        // SW registratie mislukt — geen offline, app werkt gewoon
+      });
+    }
+  }, []);
+
+  return null;
+}