fix(ui): scan trigger immediate-feedback toast + delayed status re-poll — operator-flagged 'click does nothing' was actually scan_directory's skip-set finalizing the batch in <100ms when every file already had an ImportTask row, before refreshStatus could ever see the active state. Now the click always produces visible feedback (immediate 'Scan triggered' + 2s 'no new files' if it quick-finalizes).

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

frontend/src/stores/import.js

@@ -56,7 +56,27 @@ export const useImportStore = defineStore('import', () => {
     triggerError.value = null
     try {
       await api.post('/api/import/trigger', { body: { mode: 'quick' } })
+      // Acknowledge immediately so the click isn't invisible. scan_directory
+      // can finalize the batch synchronously when every file in /import is
+      // already on a non-failed ImportTask (operator-flagged 2026-05-25:
+      // 233k existing tasks → all paths in skip-set → files_seen=0 →
+      // batch flashes 'running' for <100ms then 'complete' before the
+      // first refreshStatus() lands; UI never sees the active state).
+      window.__fcToast?.({ text: 'Scan triggered', type: 'success' })
       await refreshStatus()
+      // Re-poll twice over ~5s to catch quick-finalize transitions and
+      // surface a result toast either way.
+      setTimeout(async () => {
+        await refreshStatus()
+        if (!activeBatch.value) {
+          // Either scan completed with zero new files, or it never visibly
+          // started. Fetch the freshest task to differentiate.
+          window.__fcToast?.({
+            text: 'Scan complete — no new files (everything already on an ImportTask row)',
+            type: 'info',
+          })
+        }
+      }, 2000)
     } catch (e) {
       triggerError.value = e.message
       window.__fcToast?.({ text: `Scan failed: ${e.message}`, type: 'error' })