feat: optimize profile image sizes, silent PWA updates, storage cleanup fixes

- Resize avatars/icons to 256px and banners to 1280px (client crop + server safety net)
- Add server-side resizeProfileImage() for federation/API uploads without crop modal
- Fix unconstrained crop on RegisterPage and CreateSpace (was missing maxOutputDimension)
- PWA: switch to autoUpdate with skipWaiting/clientsClaim for seamless deploys
- Storage janitor: exclude profile images from unlinked cleanup, delete stale thumbnails
- Add deleteAttachmentByFilename() to clean orphaned attachment records for profile images
- Migration: one-time cleanup of stale profile image attachment records
- GeneralPanel: wrap in <form> to prevent implicit submission

packages/web/vite.config.ts

@@ -8,7 +8,7 @@ export default defineConfig({
   plugins: [
     react(),
     VitePWA({
-      registerType: 'prompt',
+      registerType: 'autoUpdate',
       includeAssets: ['icons/favicon-32.png', 'icons/favicon-16.png', 'icons/apple-touch-icon.png'],
       manifest: {
         name: 'Backspace',
@@ -27,6 +27,9 @@ export default defineConfig({
       workbox: {
         navigateFallback: '/index.html',
         navigateFallbackDenylist: [/^\/api/, /^\/ws/, /^\/uploads/],
+        skipWaiting: true,
+        clientsClaim: true,
+        cleanupOutdatedCaches: true,
       },
     }),
   ],