feat(01-01): create Zustand store with 6 slices, IPC batcher, and unit tests

- Install zustand 5.x and immer 11.x dependencies
- Create 6 Zustand slices: navigation, company, selection, ui, communication, social
- Create combined store with devtools + immer middleware
- Create IPC event batcher with 50ms debounce window (schedule/flush/dispose)
- Create typed selector hooks for narrow state subscriptions
- Add 14 unit tests covering store initialization, slice behaviors, and batcher timing

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

tests/unit/store.test.ts

@@ -0,0 +1,220 @@
+import { describe, it, expect, vi, beforeEach } from "vitest";
+import { useAppStore } from "@renderer/state/store";
+import type { ProfileSnapshot } from "@shared/types";
+
+// Mock window.agentCompany for refreshSnapshot test
+const mockLoadSnapshot = vi.fn();
+vi.stubGlobal("window", {
+  agentCompany: {
+    loadSnapshot: mockLoadSnapshot,
+  },
+});
+
+describe("useAppStore", () => {
+  beforeEach(() => {
+    // Reset store to initial state before each test
+    useAppStore.setState(useAppStore.getInitialState());
+    vi.clearAllMocks();
+  });
+
+  it("is created without errors and has all 6 slice properties", () => {
+    const state = useAppStore.getState();
+
+    // NavigationSlice
+    expect(state).toHaveProperty("section");
+    expect(state).toHaveProperty("setSection");
+    expect(state).toHaveProperty("commandPaletteOpen");
+    expect(state).toHaveProperty("toggleCommandPalette");
+
+    // CompanySlice
+    expect(state).toHaveProperty("snapshot");
+    expect(state).toHaveProperty("setSnapshot");
+    expect(state).toHaveProperty("refreshSnapshot");
+
+    // SelectionSlice
+    expect(state).toHaveProperty("selectedTaskId");
+    expect(state).toHaveProperty("clearCompanyScopedSelections");
+
+    // UiSlice
+    expect(state).toHaveProperty("locale");
+    expect(state).toHaveProperty("setLocale");
+
+    // CommunicationSlice - exists (even if minimal)
+    expect(state).toBeDefined();
+
+    // SocialSlice
+    expect(state).toHaveProperty("socialAccounts");
+    expect(state).toHaveProperty("setSocialAccounts");
+  });
+
+  it("NavigationSlice.setSection('tasks') updates section to 'tasks'", () => {
+    expect(useAppStore.getState().section).toBe("overview");
+
+    useAppStore.getState().setSection("tasks");
+
+    expect(useAppStore.getState().section).toBe("tasks");
+  });
+
+  it("NavigationSlice.toggleCommandPalette() toggles commandPaletteOpen and clears search on close", () => {
+    expect(useAppStore.getState().commandPaletteOpen).toBe(false);
+
+    // Open
+    useAppStore.getState().toggleCommandPalette();
+    expect(useAppStore.getState().commandPaletteOpen).toBe(true);
+
+    // Set some search state
+    useAppStore.getState().setCommandPaletteSearch("test");
+    useAppStore.getState().setSelectedPaletteIndex(3);
+    expect(useAppStore.getState().commandPaletteSearch).toBe("test");
+    expect(useAppStore.getState().selectedPaletteIndex).toBe(3);
+
+    // Close -- should clear search and index
+    useAppStore.getState().toggleCommandPalette();
+    expect(useAppStore.getState().commandPaletteOpen).toBe(false);
+    expect(useAppStore.getState().commandPaletteSearch).toBe("");
+    expect(useAppStore.getState().selectedPaletteIndex).toBe(0);
+  });
+
+  it("NavigationSlice.navigateTo('agents', 'agent-123') sets section to 'agents' and selectedAgentId to 'agent-123'", () => {
+    useAppStore.getState().navigateTo("agents", "agent-123");
+
+    expect(useAppStore.getState().section).toBe("agents");
+    expect(useAppStore.getState().selectedAgentId).toBe("agent-123");
+  });
+
+  it("SelectionSlice.clearCompanyScopedSelections() nulls all selection IDs", () => {
+    // Set some selections
+    useAppStore.getState().setSelectedTaskId("task-1");
+    useAppStore.getState().setSelectedAgentId("agent-1");
+    useAppStore.getState().setSelectedApprovalId("approval-1");
+    useAppStore.getState().setSelectedRunId("run-1");
+    useAppStore.getState().setSelectedGoalId("goal-1");
+    useAppStore.getState().setSelectedProjectId("project-1");
+    useAppStore.getState().setSelectedWorkspaceId("workspace-1");
+    useAppStore.getState().setSelectedCommunicationEntityId("comm-1");
+    useAppStore.getState().setSelectedConnectorId("conn-1");
+
+    useAppStore.getState().clearCompanyScopedSelections();
+
+    const state = useAppStore.getState();
+    expect(state.selectedTaskId).toBeNull();
+    expect(state.selectedAgentId).toBeNull();
+    expect(state.selectedApprovalId).toBeNull();
+    expect(state.selectedRunId).toBeNull();
+    expect(state.selectedGoalId).toBeNull();
+    expect(state.selectedProjectId).toBeNull();
+    expect(state.selectedWorkspaceId).toBeNull();
+    expect(state.selectedCommunicationEntityId).toBeNull();
+    // Connector is NOT cleared per spec
+    expect(state.selectedConnectorId).toBe("conn-1");
+  });
+
+  it("CompanySlice.setSnapshot(mockSnapshot) stores snapshot correctly", () => {
+    const mockSnapshot: ProfileSnapshot = {
+      currentCompanyId: "company-1",
+      profilePath: "/test/path",
+      updatesEnabled: true,
+      theme: "system",
+      locale: "en",
+      backend: { secretBackend: "safe_storage" },
+      companies: [],
+      connectors: [],
+      workspaces: [],
+      agents: [],
+      goals: [],
+      projects: [],
+      tasks: [],
+      approvals: [],
+      runs: [],
+      costs: [],
+      activity: [],
+      secrets: [],
+      comments: [],
+      socialAccounts: [],
+      meetings: [],
+      documents: [],
+      knowledgeBase: [],
+      sprints: [],
+      automationRules: [],
+      agentMessages: [],
+      workflows: [],
+    };
+
+    expect(useAppStore.getState().snapshot).toBeNull();
+
+    useAppStore.getState().setSnapshot(mockSnapshot);
+
+    expect(useAppStore.getState().snapshot).toEqual(mockSnapshot);
+  });
+
+  it("CompanySlice.refreshSnapshot() calls window.agentCompany.loadSnapshot()", async () => {
+    const mockSnapshot: ProfileSnapshot = {
+      currentCompanyId: "company-1",
+      profilePath: "/test/path",
+      updatesEnabled: true,
+      theme: "system",
+      locale: "en",
+      backend: { secretBackend: "safe_storage" },
+      companies: [],
+      connectors: [],
+      workspaces: [],
+      agents: [],
+      goals: [],
+      projects: [],
+      tasks: [],
+      approvals: [],
+      runs: [],
+      costs: [],
+      activity: [],
+      secrets: [],
+      comments: [],
+      socialAccounts: [],
+      meetings: [],
+      documents: [],
+      knowledgeBase: [],
+      sprints: [],
+      automationRules: [],
+      agentMessages: [],
+      workflows: [],
+    };
+
+    mockLoadSnapshot.mockResolvedValue({ ok: true, data: mockSnapshot });
+
+    await useAppStore.getState().refreshSnapshot();
+
+    expect(mockLoadSnapshot).toHaveBeenCalledTimes(1);
+    expect(useAppStore.getState().snapshot).toEqual(mockSnapshot);
+  });
+
+  it("UiSlice.setLocale('zh') updates locale to 'zh'", () => {
+    expect(useAppStore.getState().locale).toBe("en");
+
+    useAppStore.getState().setLocale("zh");
+
+    expect(useAppStore.getState().locale).toBe("zh");
+  });
+
+  it("SocialSlice.setSocialAccounts([account]) stores accounts", () => {
+    const account = {
+      id: "acc-1",
+      companyId: "company-1",
+      platform: "twitter" as const,
+      accountName: "@test",
+      displayName: "Test",
+      profileUrl: "https://twitter.com/test",
+      credentialSecretId: null,
+      status: "active" as const,
+      requireApproval: false,
+      metadataJson: "{}",
+      lastUsedAt: null,
+      createdAt: "2026-01-01",
+      updatedAt: "2026-01-01",
+    };
+
+    expect(useAppStore.getState().socialAccounts).toEqual([]);
+
+    useAppStore.getState().setSocialAccounts([account]);
+
+    expect(useAppStore.getState().socialAccounts).toEqual([account]);
+  });
+});