修复: 审批不超时+重启恢复 + 其他小改

- APPROVAL_TIMEOUT_MS=Infinity(已决策:审批不做超时)
- V33 迁移: ai_conversations 加 pending_approvals 列
- save_conversation 持久化 pending_approvals
- ai_conversation_switch 从 DB 恢复 pending_approvals
- switchConversation 加 try/catch(对话不存在→建新)
- @项目 关联添加取消按钮(×)
- TopBar 底部无标题时图标右对齐
- TaskDetail.vue 删除重复 case

src-tauri/src/commands/ai/conversation.rs

@@ -189,6 +189,18 @@ pub(crate) async fn save_conversation(
         )
     };
 
+
+    // 序列化当前 conv 的挂起审批快照:从 session.pending_approvals 筛选本 conv 条目,
+    // 序列化为 JSON 对象(tool_call_id → PendingApproval),落库供重启/切回时恢复。
+    let pending_approvals_json = {
+        let session = session_arc.lock().await;
+        let conv_pending: std::collections::HashMap<&String, &crate::commands::ai::PendingApproval> = session.pending_approvals
+            .iter()
+            .filter(|(_, a)| a.conversation_id.as_deref() == Some(conv_id))
+            .collect();
+        serde_json::to_string(&conv_pending).unwrap_or_else(|_| "{}".to_string())
+    };
+
     // F-260619-03 批次 B:映射 Vec<ChatMessage> → Vec<AiMessageRecord>(带 seq 索引 + conv_id)
     //   全量重写 ai_messages(单事务 DELETE + INSERT OR IGNORE,原子无中间空窗)。
     //   created_at 用对话级 created_at(老对话 None 时 now 兜底),保证消息创建时间与对话一致。
@@ -227,6 +239,8 @@ pub(crate) async fn save_conversation(
             }
             // G1 目标钉扎持久化:将 per_conv.pinned_goals 写入 DB
             rec.pinned_goals = Some(serde_json::to_string(&pinned_goals).unwrap_or_else(|_| "[]".to_string()));
+            // 挂起审批快照持久化:每轮 save 同步当前 pending_approvals 快照
+            rec.pending_approvals = Some(pending_approvals_json.clone());
             // update_full 仍写 messages 列(保留旧值,本批不改 messages 字段),写元数据 + updated_at
             if let Err(e) = conv_repo.update_full(&rec).await {
                 tracing::warn!("更新对话元数据失败 {conv_id}: {e}");
@@ -254,6 +268,7 @@ pub(crate) async fn save_conversation(
                 prompt_tokens: usage.map(|u| u.prompt_tokens as i64),
                 completion_tokens: usage.map(|u| u.completion_tokens as i64),
                 pinned_goals: Some(serde_json::to_string(&pinned_goals).unwrap_or_else(|_| "[]".to_string())),
+                pending_approvals: Some(pending_approvals_json.clone()),
                 created_at: conv_created.clone(),
                 updated_at: now,
             };