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/lib/lazyWithRetry.ts

@@ -0,0 +1,34 @@
+import { lazy } from 'react'
+
+/**
+ * Wraps React.lazy with retry logic for stale chunk errors after deployments.
+ * On first failure, reloads the page once to get fresh asset manifest.
+ */
+export function lazyWithRetry<T extends React.ComponentType<unknown>>(
+  importFn: () => Promise<{ default: T }>,
+) {
+  return lazy(() =>
+    importFn().catch((error: Error) => {
+      const isChunkError =
+        error.message.includes('dynamically imported module') ||
+        error.message.includes('Loading chunk') ||
+        error.message.includes('importing a module script failed') ||
+        error.message.includes('loading css chunk')
+
+      if (!isChunkError) throw error
+
+      // Only auto-reload once per 10 seconds to prevent loops
+      const key = 'rf_lazy_chunk_reload'
+      const lastReload = sessionStorage.getItem(key)
+      const now = Date.now()
+
+      if (!lastReload || now - Number(lastReload) > 10_000) {
+        sessionStorage.setItem(key, String(now))
+        window.location.reload()
+      }
+
+      // If we already reloaded recently and it still fails, let it propagate
+      throw error
+    }),
+  )
+}