fix: stale chunk auto-reload + image paste upload UX

- Add lazyWithRetry wrapper for all lazy-loaded routes to auto-reload
  on stale chunk errors after deploys (prevents ErrorBoundary flash)
- Show toast notification when image paste/upload fails due to storage
  not configured (503), instead of silent tiny error thumbnails
- Remove failed uploads from thumbnail strip on 503 (was showing
  confusing retry icon)
- Pass completed upload IDs in navigation state from dashboard input
- Suppress Sentry dialog for chunk load errors (deploy artifacts)

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

frontend/src/components/common/ErrorBoundary.tsx

@@ -70,7 +70,14 @@ export function ErrorBoundary({ children, fallback }: Props) {
         if (fallback) return fallback as React.ReactElement
         return <DefaultFallback error={error as Error} resetError={resetError} />
       }}
-      showDialog
+      beforeCapture={(scope, error) => {
+        // Don't report chunk load errors to Sentry — they're deploy artifacts, not bugs
+        if (error && isChunkLoadError(error as Error)) {
+          scope.setLevel('info')
+          scope.setTag('chunk_load_error', 'true')
+        }
+      }}
+      showDialog={false}
     >
       {children}
     </Sentry.ErrorBoundary>