sprint: fixes batch — saveNote history, DeepSeek retry, channel rotation, test fixes, docker env, blocking transcript, sync errors

frontend/src/routes/YoutubeDashboard.svelte

@@ -88,8 +88,14 @@
     syncMessage = 'Syncing...';
     try {
       const res = await fetch('/api/videos/fetch', { method: 'POST' });
-      if (res.ok) setTimeout(() => { loadVideos(); isSyncing = false; syncMessage = ''; }, 6000);
-    } catch (err) { isSyncing = false; syncMessage = ''; }
+      if (res.ok) {
+        syncMessage = 'Sync started...';
+        setTimeout(() => { loadVideos(); isSyncing = false; syncMessage = ''; }, 6000);
+      } else {
+        isSyncing = false;
+        syncMessage = 'Sync failed';
+      }
+    } catch (err) { isSyncing = false; syncMessage = 'Network error'; }
   }
 
   async function updateStatus(videoId, newStatus, silent = false) {
@@ -217,8 +223,12 @@
   function saveNote() {
     const vid = selectedVideo?.video_id;
     if (!vid) return;
-    const text = notes[vid] || '';
-    const stamped = text && !text.startsWith('[') ? `[${new Date().toLocaleString()}] ${text}` : text;
+    const prev = notes[vid] || '';
+    const textarea = document.querySelector('#note-textarea');
+    const current = textarea ? textarea.value : prev;
+    if (!current.trim()) return;
+    const ts = new Date().toLocaleString();
+    const stamped = `[${ts}] ${current.trim()}\n${prev}`;
     notes = {...notes, [vid]: stamped};
     localStorage.setItem('t-yt-notes', JSON.stringify(notes));
     activeNote = null;
@@ -377,7 +387,7 @@
           <!-- Note editor/viewer -->
           {#if activeNote === selectedVideo.video_id}
             <div class="space-y-1.5">
-              <textarea rows="2" class="w-full text-xs p-2 rounded border resize-none"
+              <textarea id="note-textarea" rows="2" class="w-full text-xs p-2 rounded border resize-none"
                 style="background:var(--bg-tertiary);color:var(--text-primary);border-color:var(--border)"
                 placeholder="Quick note..."
                 value={notes[selectedVideo.video_id] || ''}