refactor(chat): execution graph optimize (#873)

Co-authored-by: Haze <hazeone@users.noreply.github.com>

tests/unit/chat-event-dedupe.test.ts

@@ -0,0 +1,140 @@
+import { beforeEach, describe, expect, it, vi } from 'vitest';
+import { extractText } from '@/pages/Chat/message-utils';
+
+const { gatewayRpcMock, hostApiFetchMock, agentsState } = vi.hoisted(() => ({
+  gatewayRpcMock: vi.fn(),
+  hostApiFetchMock: vi.fn(),
+  agentsState: {
+    agents: [] as Array<Record<string, unknown>>,
+  },
+}));
+
+vi.mock('@/stores/gateway', () => ({
+  useGatewayStore: {
+    getState: () => ({
+      status: { state: 'running', port: 18789 },
+      rpc: gatewayRpcMock,
+    }),
+  },
+}));
+
+vi.mock('@/stores/agents', () => ({
+  useAgentsStore: {
+    getState: () => agentsState,
+  },
+}));
+
+vi.mock('@/lib/host-api', () => ({
+  hostApiFetch: (...args: unknown[]) => hostApiFetchMock(...args),
+}));
+
+describe('chat event dedupe', () => {
+  beforeEach(() => {
+    vi.resetModules();
+    window.localStorage.clear();
+    gatewayRpcMock.mockReset();
+    hostApiFetchMock.mockReset();
+    agentsState.agents = [];
+  });
+
+  it('keeps processing delta events without seq for the same run', async () => {
+    const { useChatStore } = await import('@/stores/chat');
+
+    useChatStore.setState({
+      currentSessionKey: 'agent:main:main',
+      currentAgentId: 'main',
+      sessions: [{ key: 'agent:main:main' }],
+      messages: [],
+      sessionLabels: {},
+      sessionLastActivity: {},
+      sending: false,
+      activeRunId: null,
+      streamingText: '',
+      streamingMessage: null,
+      streamingTools: [],
+      pendingFinal: true,
+      lastUserMessageAt: null,
+      pendingToolImages: [],
+      error: null,
+      loading: false,
+      thinkingLevel: null,
+    });
+
+    useChatStore.getState().handleChatEvent({
+      state: 'delta',
+      runId: 'run-no-seq',
+      sessionKey: 'agent:main:main',
+      message: {
+        role: 'assistant',
+        id: 'reply-stream',
+        content: [{ type: 'text', text: 'Checked X.' }],
+      },
+    });
+
+    useChatStore.getState().handleChatEvent({
+      state: 'delta',
+      runId: 'run-no-seq',
+      sessionKey: 'agent:main:main',
+      message: {
+        role: 'assistant',
+        id: 'reply-stream',
+        content: [
+          { type: 'text', text: 'Checked X.' },
+          { type: 'text', text: 'Checked X. Here is the summary.' },
+        ],
+      },
+    });
+
+    expect(extractText(useChatStore.getState().streamingMessage)).toBe('Checked X. Here is the summary.');
+  });
+
+  it('still dedupes repeated delta events when seq matches', async () => {
+    const { useChatStore } = await import('@/stores/chat');
+
+    useChatStore.setState({
+      currentSessionKey: 'agent:main:main',
+      currentAgentId: 'main',
+      sessions: [{ key: 'agent:main:main' }],
+      messages: [],
+      sessionLabels: {},
+      sessionLastActivity: {},
+      sending: false,
+      activeRunId: null,
+      streamingText: '',
+      streamingMessage: null,
+      streamingTools: [],
+      pendingFinal: false,
+      lastUserMessageAt: null,
+      pendingToolImages: [],
+      error: null,
+      loading: false,
+      thinkingLevel: null,
+    });
+
+    useChatStore.getState().handleChatEvent({
+      state: 'delta',
+      runId: 'run-with-seq',
+      sessionKey: 'agent:main:main',
+      seq: 3,
+      message: {
+        role: 'assistant',
+        id: 'reply-stream',
+        content: [{ type: 'text', text: 'first version' }],
+      },
+    });
+
+    useChatStore.getState().handleChatEvent({
+      state: 'delta',
+      runId: 'run-with-seq',
+      sessionKey: 'agent:main:main',
+      seq: 3,
+      message: {
+        role: 'assistant',
+        id: 'reply-stream',
+        content: [{ type: 'text', text: 'duplicate version should be ignored' }],
+      },
+    });
+
+    expect(extractText(useChatStore.getState().streamingMessage)).toBe('first version');
+  });
+});