fix(web): pin preset before subagent header action

packages/client/ui-agent-preset/README.i18n.yaml

@@ -2,5 +2,5 @@
 # side as of the last confirmed-consistent state. Both languages carry equal authority;
 # after editing either side, bring the other along and re-record with:
 #   pnpm run verify-translation-pairing --write packages/client/ui-agent-preset/README.md
-README.md: c4c7df4e6fbe0479cac4767247c1b10fd65aad77
-README.zh.md: 84c02977ec18f89c06311b570428f92c2b459fb3
+README.md: 008066114e9c49e5c74299979e24c27a4c9621c9
+README.zh.md: e07d5994ae196cd03be7818fe4ade1aafda9aa55

packages/client/ui-agent-preset/README.md

@@ -18,7 +18,7 @@ A session that has started is refused rather than queued: the host answers `agen
 
 ## The session-header label
 
-A third surface, beside the session title: the preset THIS session runs, as static chrome. It precedes the subagent catalog in the header action row. A control there would promise a switch the host refuses outright. It reads the preset from the session's own summary — a resumed session runs what it was created with, not today's default — and resolves the display name against the same roster the General row reads.
+A third surface, beside the session title: the preset THIS session runs, as static chrome. A control there would promise a switch the host refuses outright. It reads the preset from the session's own summary — a resumed session runs what it was created with, not today's default — and resolves the display name against the same roster the General row reads.
 
 ## What it reads and writes
 

packages/client/ui-agent-preset/README.zh.md

@@ -18,7 +18,7 @@ chip 以部署默认值打开，其选择是**暂存**的——该界面先于
 
 ## 会话标题旁的标签
 
-第三个表层，位于会话标题旁：**本会话**所运行的 preset，作为静态装饰呈现。它在头部操作行中排在 subagent 列表之前。在那里放一个控件，等于承诺一次宿主会断然拒绝的切换。它从会话自身的摘要读取 preset——被恢复的会话运行的是它创建时的那一份，而非今天的默认值——并在 General 行所读的同一份名单上解析显示名称。
+第三个表层，位于会话标题旁：**本会话**所运行的 preset，作为静态装饰呈现。在那里放一个控件，等于承诺一次宿主会断然拒绝的切换。它从会话自身的摘要读取 preset——被恢复的会话运行的是它创建时的那一份，而非今天的默认值——并在 General 行所读的同一份名单上解析显示名称。
 
 ## 它读什么、写什么
 

packages/client/ui-agent-preset/src/client/index.ts

@@ -157,7 +157,8 @@ export function apply(ctx: ClientContext): void {
       const label = scope.slots.register({
         name: 'conversation.session.header.actions',
         id: 'agent-preset',
-        order: 0,
+        // Static session context occupies the header's leading negative-order band.
+        order: -10,
         locale: 'settings.agentPreset',
         inject: labelInjected,
       }, AgentPresetLabel)

packages/client/ui-agent-preset/tests/apply.spec.ts

@@ -304,7 +304,7 @@ describe('ui-agent-preset apply', () => {
     expect(chip.component).toBe(AgentPresetSeat)
     const label = slots.entries('conversation.session.header.actions')[0]!
     expect(label.component).toBe(AgentPresetLabel)
-    expect(label.options).toMatchObject({ id: 'agent-preset', order: 0 })
+    expect(label.options).toMatchObject({ id: 'agent-preset', order: -10 })
     await fiber.dispose()
     expect(slots.entries('conversation.hero.agentPreset')).toHaveLength(0)
     expect(slots.entries('conversation.session.header.actions')).toHaveLength(0)

packages/client/ui-conversation/src/client/contract/slots.ts

@@ -38,7 +38,11 @@ declare module '@deepseek-ai/dsh-client-ui-slots' {
     'conversation.session': { kind: 'single'; scope: 'session' }
     /** Strict-session header above the resident conversation scrollport. */
     'conversation.session.header': { kind: 'single'; scope: 'session' }
-    /** Session-header actions contributed by feature plugins. */
+    /**
+     * Session-header actions contributed by feature plugins. Entries render
+     * by ascending `order`; negative values are reserved for static session
+     * context that precedes interactive actions.
+     */
     'conversation.session.header.actions': { kind: 'list'; scope: 'session'; owner: ConversationHeaderActionOwnerProps }
     /**
      * The conversation view ring: one list entry per view tab (chat here;