后台同步异常时前端显示错误提示，不再卡住页面

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

ft-app/app/collector.py

@@ -5,7 +5,7 @@ from app.database import SessionLocal
 from app.models import DailyBar, Contract
 from app.engine.lock_strategy import compute_amp_5d
 
-_progress = {"running": False, "label": "", "done": 0, "total": 0, "result": 0, "finished": False}
+_progress = {"running": False, "label": "", "done": 0, "total": 0, "result": 0, "finished": False, "error": ""}
 _lock = threading.Lock()
 
 
@@ -18,11 +18,14 @@ def _start_bg(target, label):
     with _lock:
         if _progress["running"]:
             return False
-        _progress.update(running=True, finished=False, label=label, done=0, total=0)
+        _progress.update(running=True, finished=False, label=label, done=0, total=0, error="")
 
     def _run():
         try:
             target()
+        except Exception as e:
+            with _lock:
+                _progress["error"] = str(e)
         finally:
             with _lock:
                 _progress["running"] = False

ft-app/app/templates/admin.html

@@ -192,6 +192,12 @@
 </div>
 
 <script>
+function escapeHtml(s) {
+  var d = document.createElement('div');
+  d.appendChild(document.createTextNode(s));
+  return d.innerHTML;
+}
+
 var syncTimer = null;
 var progressShownAt = 0;
 
@@ -218,6 +224,19 @@ function pollProgress() {
       document.getElementById('sync-progress-pct').textContent = pct + '%';
       document.getElementById('sync-progress-label').textContent = data.label;
 
+      if (data.error) {
+        clearInterval(syncTimer);
+        syncTimer = null;
+        document.getElementById('sync-progress-bar').style.background = 'var(--danger)';
+        document.getElementById('sync-progress-label').innerHTML =
+          '<span style="color:var(--danger-fg);">✕ ' + escapeHtml(data.label) + '</span>' +
+          '<span style="display:block;font-size:0.78rem;color:var(--danger-fg);margin-top:4px;">' + escapeHtml(data.error) + '</span>';
+        document.getElementById('sync-progress-pct').textContent = '';
+        document.getElementById('sync-progress').insertAdjacentHTML('beforeend',
+          '<button onclick="hideProgress()" style="display:block;margin-top:10px;padding:4px 14px;border:1px solid var(--border);border-radius:5px;background:var(--surface);color:var(--fg);cursor:pointer;font-size:0.8rem;">关闭</button>');
+        return;
+      }
+
       if (data.finished) {
         var elapsed = Date.now() - progressShownAt;
         var delay = elapsed < 1000 ? 1000 - elapsed : 0;