fix(web): address model retry review feedback

packages/client/connection/src/client/fixture.ts

@@ -792,6 +792,24 @@ export function createFixtureApi(options: FixtureOptions = {}): ApiProxy {
       scenario.turn = next
       scenario.stepStarted = false
     },
+    /** Record one retry decision, then cancel its source turn before the retry starts. */
+    cancelModelRetryDuringBackoff(id: string, delayMs = 450): void {
+      const sessionId = sid(id)
+      const scenario = retryScenarios.get(sessionId)
+      if (scenario === undefined) throw new Error(`fixture: no model retry scenario for ${id}`)
+      const failure = { code: 'TRANSPORT', message: '连接被重置' }
+      append(sessionId, {
+        type: 'llm/retry',
+        data: {
+          turn: scenario.turn, step: 1,
+          provider: 'fixture', mode: 'normal', policyKey: 'fixture-normal',
+          retry: 1, maxRetries: 2, delayMs, failure,
+        },
+      })
+      append(sessionId, { type: 'turn/end', data: { turn: scenario.turn, reason: { kind: 'aborted' } } })
+      retryScenarios.delete(sessionId)
+      setRunning(sessionId, false)
+    },
     /** Finish the timing-hook retry with a finalized response in the open retry turn. */
     completeModelRetry(id: string): void {
       const sessionId = sid(id)

packages/client/connection/tests/fixture.spec.ts

@@ -21,6 +21,7 @@ interface TimingHooks {
   appendTitle(id: string, title: string): void
   beginModelRetry(id: string): void
   scheduleModelRetry(id: string, retry?: number, delayMs?: number): void
+  cancelModelRetryDuringBackoff(id: string, delayMs?: number): void
   completeModelRetry(id: string): void
   appendSilent(id: string, msg: string): void
   breakStreams(): void
@@ -630,10 +631,15 @@ describe('createFixtureApi', () => {
     hooks.beginModelRetry('fx-alpha')
     hooks.scheduleModelRetry('fx-alpha')
     hooks.completeModelRetry('fx-alpha')
+    hooks.beginModelRetry('fx-alpha')
+    hooks.cancelModelRetryDuringBackoff('fx-alpha')
     await vi.waitFor(() => {
       expect(seen.some(f => f.type === 'session/event' && JSON.stringify(f.event.data).includes('正常直播'))).toBe(true)
       expect(seen.some(f => f.type === 'session/event' && (f.event as { type: string }).type === 'llm/retry')).toBe(true)
       expect(seen.some(f => f.type === 'session/event' && JSON.stringify(f.event.data).includes('重试后的完整回复'))).toBe(true)
+      expect(seen.some(f => f.type === 'session/event'
+        && f.event.type === 'turn/end'
+        && f.event.data.reason.kind === 'aborted')).toBe(true)
       expect(seen.some(f => f.type === 'session/projection' && f.key === 'title' && f.value === 'Fixture 修订标题')).toBe(true)
     })
     expect(seen.some(f => f.type === 'session/event' && JSON.stringify(f.event.data).includes('静默丢帧'))).toBe(false)