feat(client): inject slot declaration lifetimes

packages/client/ui-trajectory/src/client/index.ts

@@ -10,14 +10,8 @@ import type {} from '@deepseek-ai/dsh-client-ui-conversation/client'
 import { createTrajectoryDurationStore } from './duration-store.ts'
 import { TrajectoryView, type TrajectoryViewInjected } from './TrajectoryView.tsx'
 
-/**
- * Required services (cordis fiber inject). 'conversation' is an ordering
- * edge, not a call dependency: the 'conversation.view' slot is declared by
- * ui-conversation's apply (which then provides the service), and register()
- * into an undeclared slot throws — service waiting is what orders this
- * apply after the declaring one.
- */
-export const inject = ['slots', 'conversation', 'sessionHistory']
+/** Required services: the conversation view slot and independent history source. */
+export const inject = ['slots', 'sessionHistory']
 
 /**
  * Client plugin body: register the trajectory view tab. The registration
@@ -26,7 +20,7 @@ export const inject = ['slots', 'conversation', 'sessionHistory']
  */
 export function apply(ctx: Context): void {
   const duration = createTrajectoryDurationStore()
-  ctx.slots.register({
+  ctx.slots.inject('conversation.view', () => ctx.slots.register({
     name: 'conversation.view',
     id: 'trajectory',
     order: 10,
@@ -40,5 +34,5 @@ export function apply(ctx: Context): void {
         setActualDuration: (value) => { duration.set(value) },
       }
     },
-  }, TrajectoryView)
+  }, TrajectoryView))
 }