fix(desktop): DeerFlow UI — ChatArea refactor + ai-elements + dead CSS cleanup

ChatArea retry button uses setInput instead of direct sendToGateway,
fix bootstrap spinner stuck for non-logged-in users,
remove dead CSS (aurora-title/sidebar-open/quick-action-chips),
add ai components (ReasoningBlock/StreamingText/ChatMode/ModelSelector/TaskProgress),
add ClassroomPlayer + ResizableChatLayout + artifact panel

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

crates/zclaw-saas/src/workers/update_last_used.rs

@@ -8,7 +8,8 @@ use super::Worker;
 
 #[derive(Debug, Serialize, Deserialize)]
 pub struct UpdateLastUsedArgs {
-    pub token_id: String,
+    /// token_hash 用于 WHERE 条件匹配
+    pub token_hash: String,
 }
 
 pub struct UpdateLastUsedWorker;
@@ -23,9 +24,9 @@ impl Worker for UpdateLastUsedWorker {
 
     async fn perform(&self, db: &PgPool, args: Self::Args) -> SaasResult<()> {
         let now = chrono::Utc::now().to_rfc3339();
-        sqlx::query("UPDATE api_tokens SET last_used_at = $1 WHERE id = $2")
+        sqlx::query("UPDATE api_tokens SET last_used_at = $1 WHERE token_hash = $2")
             .bind(&now)
-            .bind(&args.token_id)
+            .bind(&args.token_hash)
             .execute(db)
             .await?;
         Ok(())