重构: 对话透明化 L1 + ③.2 审批拆分 + ⑥.4 @展开 + DAG 展示

修复 tool_result 压缩零效果(BUG-260628-01):单行/少行/JSON 大字符
串字段逃逸压缩的问题,基于实测数据(53/94 次迭代零节省)调参,
增加字符级保底截断,压缩有效率从 8% 提升至 ~85%+

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

@@ -164,7 +164,7 @@ pub(crate) async fn save_conversation(
     //   loop 内 save 由 run_agentic_loop 入参 conv_id 透传;IPC 路径(commands.rs)save 也传 conv_id。
     //   conv() 惰性建:save 路径 conv 必然已建(send/regenerate/edit/switch 均先 conv());若极端
     //   未建(如启动恢复无 live conv),conv() 建空 PerConvState,save 空 messages(幂等不污染)。
-    let (persist_msgs, provider_id, created_at) = {
+    let (persist_msgs, provider_id, created_at, pinned_goals) = {
         let mut session = session_arc.lock().await;
         let mut msgs = session.conv(conv_id).messages.all_messages_clone();
         for m in &mut msgs {
@@ -185,6 +185,7 @@ pub(crate) async fn save_conversation(
             msgs,
             session.active_provider_id.clone(),
             session.active_conv_created_at.clone(),
+            session.conv(conv_id).pinned_goals.clone(),
         )
     };
 
@@ -224,6 +225,8 @@ pub(crate) async fn save_conversation(
                 if !list.iter().any(|x| x == m) { list.push(m.to_string()); }
                 rec.models = Some(serde_json::to_string(&list).unwrap_or_else(|_| "[]".to_string()));
             }
+            // 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()));
             // 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}");
@@ -250,6 +253,7 @@ pub(crate) async fn save_conversation(
                 pinned: false,
                 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())),
                 created_at: conv_created.clone(),
                 updated_at: now,
             };