fix: 分页问题

packages/client/runtime/src/client/sessions/assistant-timing.ts

@@ -2,9 +2,14 @@
 // history fold derive AssistantTiming from the same step/start -> first token
 // delta -> assistant/message sequence.
 
+import { isTokenDelta } from '@deepseek-ai/dsh-llm/message'
 import type { SessionEvent } from '@deepseek-ai/dsh-session/types'
 import type { AssistantTiming } from './conversation.ts'
 
+// The first-token predicate lives with the StreamChunk vocabulary in dsh-llm;
+// re-exported here so Chat Definitions keep their client-runtime import.
+export { isTokenDelta } from '@deepseek-ai/dsh-llm/message'
+
 /** Pre-finalize timing boundaries for one assistant step (start + first token). */
 export interface AssistantStepMetadata {
   stepStartTime: number | null
@@ -21,24 +26,6 @@ export function assistantStepKey(turn: number, step: number): string {
   return `${turn}\u0000${step}`
 }
 
-/**
- * Whether a chunk carries visible model output (first-token boundary). Empty
- * deltas (heartbeats, empty tool-call frames) do not count as a first token.
- * @param chunk - the assistant/chunk payload.
- * @returns true when the chunk contains a non-empty text/reasoning/tool delta.
- */
-export function isTokenDelta(chunk: SessionEvent<'assistant/chunk'>['data']['chunk']): boolean {
-  switch (chunk.type) {
-    case 'text-delta':
-    case 'reasoning-delta':
-      return chunk.text !== ''
-    case 'tool-call-delta':
-      return chunk.argumentsDelta !== '' || chunk.name !== undefined
-    default:
-      return false
-  }
-}
-
 /**
  * Fold one event into the per-step timing index: step/start opens the entry,
  * the first non-empty token delta stamps first-token time once. Other event