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>

src/renderer/state/hooks.ts

@@ -0,0 +1,47 @@
+import { useAppStore } from "./store";
+
+// Navigation slice selectors
+export const useSection = () => useAppStore((s) => s.section);
+export const useSetSection = () => useAppStore((s) => s.setSection);
+export const useNavigateTo = () => useAppStore((s) => s.navigateTo);
+export const useCommandPaletteOpen = () =>
+  useAppStore((s) => s.commandPaletteOpen);
+export const useConsoleOpen = () => useAppStore((s) => s.consoleOpen);
+export const useSidebarCollapsed = () =>
+  useAppStore((s) => s.sidebarCollapsed);
+
+// Company slice selectors
+export const useSnapshot = () => useAppStore((s) => s.snapshot);
+export const useCurrentCompanyId = () =>
+  useAppStore((s) => s.currentCompanyId);
+export const useError = () => useAppStore((s) => s.error);
+export const useInboxItems = () => useAppStore((s) => s.inboxItems);
+export const useCompanyMetrics = () => useAppStore((s) => s.companyMetrics);
+export const useStandupReport = () => useAppStore((s) => s.standupReport);
+export const useBadges = () => useAppStore((s) => s.badges);
+
+// Selection slice selectors
+export const useSelectedTaskId = () => useAppStore((s) => s.selectedTaskId);
+export const useSelectedAgentId = () =>
+  useAppStore((s) => s.selectedAgentId);
+export const useSelectedApprovalId = () =>
+  useAppStore((s) => s.selectedApprovalId);
+export const useSelectedRunId = () => useAppStore((s) => s.selectedRunId);
+export const useSelectedGoalId = () => useAppStore((s) => s.selectedGoalId);
+export const useSelectedProjectId = () =>
+  useAppStore((s) => s.selectedProjectId);
+export const useSelectedWorkspaceId = () =>
+  useAppStore((s) => s.selectedWorkspaceId);
+export const useSelectedConnectorId = () =>
+  useAppStore((s) => s.selectedConnectorId);
+export const useSelectedCommunicationEntityId = () =>
+  useAppStore((s) => s.selectedCommunicationEntityId);
+
+// UI slice selectors
+export const useLocale = () => useAppStore((s) => s.locale);
+export const useShowOnboarding = () => useAppStore((s) => s.showOnboarding);
+export const useTaskViewMode = () => useAppStore((s) => s.taskViewMode);
+
+// Social slice selectors
+export const useSocialAccounts = () => useAppStore((s) => s.socialAccounts);
+export const useBrowserActions = () => useAppStore((s) => s.browserActions);