fix: two UX issues

1. Settings X button: closeSettings() goes back, skipping hash-only navigation
   → No more double-click to close

2. Workspaces page: Connect Gitea link now includes &mode=link
   → Same link as Settings → Integrations (was missing mode=link)

app/templates/workspaces.html

@@ -88,7 +88,7 @@
     <!-- Not linked -->
     <div class="gitea-empty" x-show="giteaStatus==='not_linked'">
       <div>Connect your Gitea account to see your projects.</div>
-      <a class="gitea-connect" href="/auth/login?provider=gitea">🔗 Connect Gitea</a>
+      <a class="gitea-connect" href="/auth/login?provider=gitea&mode=link">🔗 Connect Gitea</a>
       <span style="margin:0 8px;color:var(--text-dim);">or</span>
       <a class="gitea-connect" href="/auth/login?provider=gitea">📝 Register with Gitea</a>
     </div>