feat: Display 'All uploads complete' banner on finish

Co-authored-by: aider (gemini/gemini-2.5-pro) <aider@aider.chat>

frontend/app.js

@@ -34,6 +34,7 @@ try {
 } catch {}
 let items = [];
 let socket;
+let allCompleteBannerShown = false;
 
 // Status precedence: never regress (e.g., uploading -> done shouldn't go back to uploading)
 const STATUS_ORDER = { queued: 0, checking: 1, uploading: 2, duplicate: 3, done: 3, error: 4 };
@@ -92,6 +93,7 @@ function addItem(file, relativePath){
   const resolvedPath = (relativePath !== undefined) ? relativePath : (file.webkitRelativePath || '');
   const it = { id, file, name: file.name, size: file.size, status: 'queued', progress: 0, relativePath: resolvedPath };
   items.unshift(it);
+  allCompleteBannerShown = false;
   render();
 }
 
@@ -155,6 +157,15 @@ function render(){
   document.getElementById('countDone').textContent=c.done;
   document.getElementById('countDup').textContent=c.dup;
   document.getElementById('countErr').textContent=c.err;
+
+  if (!allCompleteBannerShown && items.length > 0) {
+    const isComplete = items.every(it => FINAL_STATES.has(it.status));
+    const hasSuccess = items.some(it => it.status === 'done' || it.status === 'duplicate');
+    if (isComplete && hasSuccess) {
+      showBanner("All uploads complete.", "ok");
+      allCompleteBannerShown = true;
+    }
+  }
 }
 
 // --- WebSocket progress ---