fix: restore coding history and quota feedback

tests/unit/coding-conversation-timeline.test.tsx

@@ -631,7 +631,83 @@ describe('CodingConversationTimeline', () => {
       .toBeVisible();
   });
 
-  it('windows long timelines and loads earlier nodes only on demand', async () => {
+  it('shows an actionable non-retryable quota failure in the process summary', async () => {
+    const { codingConversationStore } = await import('@/stores/coding-conversations');
+    const { CodingConversationTimeline } = await import(
+      '@/pages/Chat/CodingConversationTimeline'
+    );
+    const base = createProductSnapshot('conversation-quota-failure', 1);
+    const snapshot = {
+      ...base,
+      run: {
+        status: 'idle' as const,
+        runId: 'run-quota-failure',
+        startedAt: 1_000,
+        settledAt: 6_000,
+        terminalReason: 'failed' as const,
+        error: {
+          code: 'CODING_PROVIDER_QUOTA_EXHAUSTED' as const,
+          message: '词元点数余额不足，请充值后重试。',
+          recoverable: false,
+        },
+      },
+      nodes: [{
+        kind: 'tool' as const,
+        id: 'tool-quota-failure',
+        toolCallId: 'call-quota-failure',
+        toolName: 'bash',
+        title: '执行命令',
+        inputText: '',
+        status: 'error' as const,
+        output: [],
+      }],
+    };
+    codingConversationStore.getState().applySnapshotEvent({
+      type: 'snapshot',
+      conversationId: 'conversation-quota-failure',
+      workerGeneration: 1,
+      seq: snapshot.cursor.seq,
+      snapshot,
+    });
+
+    render(<CodingConversationTimeline conversationId="conversation-quota-failure" />);
+
+    expect(within(screen.getByTestId('coding-process-group'))
+      .getByText('词元点数余额不足，请充值后重试。 · 5 秒')).toBeVisible();
+  });
+
+  it('shows an actionable persisted Provider failure after reopening a Conversation', async () => {
+    const { codingConversationStore } = await import('@/stores/coding-conversations');
+    const { CodingConversationTimeline } = await import(
+      '@/pages/Chat/CodingConversationTimeline'
+    );
+    const base = createProductSnapshot('conversation-persisted-quota-failure', 1);
+    const snapshot = {
+      ...base,
+      run: { status: 'idle' as const },
+      nodes: [{
+        kind: 'notice' as const,
+        id: 'persisted-quota-notice',
+        code: 'CODING_PROVIDER_QUOTA_EXHAUSTED',
+        level: 'error' as const,
+        message: '词元点数余额不足，请充值后重试。',
+      }],
+    };
+    codingConversationStore.getState().applySnapshotEvent({
+      type: 'snapshot',
+      conversationId: 'conversation-persisted-quota-failure',
+      workerGeneration: 1,
+      seq: snapshot.cursor.seq,
+      snapshot,
+    });
+
+    render(<CodingConversationTimeline conversationId="conversation-persisted-quota-failure" />);
+
+    expect(screen.getByTestId('coding-process-group').querySelector('summary'))
+      .toHaveTextContent('词元点数余额不足，请充值后重试。');
+  });
+
+  it('windows long timelines, loads near the top, and preserves the scroll anchor', async () => {
     const { codingConversationStore } = await import('@/stores/coding-conversations');
     const { CodingConversationTimeline } = await import(
       '@/pages/Chat/CodingConversationTimeline'
@@ -659,8 +735,17 @@ describe('CodingConversationTimeline', () => {
 
     expect(screen.queryByText('Notice 0')).not.toBeInTheDocument();
     expect(screen.getByText('Notice 30')).toBeInTheDocument();
-    fireEvent.click(screen.getByRole('button', { name: '加载更早内容' }));
-    expect(screen.getByText('Notice 0')).toBeInTheDocument();
+    const timeline = screen.getByTestId('coding-conversation-timeline');
+    Object.defineProperty(timeline, 'scrollHeight', {
+      configurable: true,
+      get: () => screen.queryByText('Notice 0') ? 1_600 : 1_000,
+    });
+    timeline.scrollTop = 0;
+
+    fireEvent.scroll(timeline);
+
+    await waitFor(() => expect(screen.getByText('Notice 0')).toBeInTheDocument());
+    expect(timeline.scrollTop).toBe(600);
   });
 
   it('does not commit the selected timeline when a hidden Conversation streams', async () => {