Add active-turn steering (#3394)

* feat(agents): add active-turn steering

Let users choose whether an immediate prompt interrupts or joins the active turn. The daemon owns exact-turn admission, provider delivery, safe fallback, and canonical timeline identity while queueing remains client-side.

* fix(agents): stabilize steering history and replay QA

* fix(agents): preserve steering timeline order

* fix(agents): reconcile resumed provider history

* fix(agents): serialize steering with cancellation

* test(agents): prove Claude multi-tool steering

* test(agents): force explicit history hydration

* fix(agents): flush output before steer admission

packages/app/src/i18n/resources/zh-CN.ts

@@ -97,6 +97,7 @@ export const zhCN: TranslationResources = {
       interruptAgent: "中断 Agent",
       queueMessage: "消息排队",
       sendAndInterrupt: "发送并中断",
+      sendAndSteer: "发送并引导",
       sendMessage: "发送消息",
       queue: "排队",
       send: "发送",
@@ -1804,10 +1805,12 @@ export const zhCN: TranslationResources = {
         label: "默认发送",
         descriptions: {
           interrupt: "Agent 运行时，Enter 会中断。Command/Ctrl+Enter 会排队。",
+          steer: "Agent 运行时，Enter 会引导当前回合。Command/Ctrl+Enter 会排队。",
           queue: "Agent 运行时，Enter 会排队。Command/Ctrl+Enter 会提交。",
         },
         options: {
           interrupt: "中断",
+          steer: "引导",
           queue: "排队",
         },
       },