feat(01-01): migrate App.tsx from 31 useState calls to Zustand store

- Replace all 31 useState declarations with useAppStore selectors
- Add direct setters (setCommandPaletteOpen, setConsoleOpen, etc.) to NavigationSlice
- Replace IPC debounce with createEventBatcher (50ms window)
- Route shortcut events through store.getState() for toggle actions
- Remove unused type imports (SidebarBadges, CompanyMetrics, etc.)
- Zero useState calls remain in App.tsx (down from 31)
- TypeScript compilation passes with zero errors
- All 14 unit tests continue to pass

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

src/renderer/state/slices/navigation.ts

@@ -11,11 +11,15 @@ export interface NavigationSlice {
   sidebarCollapsed: boolean;
   companySwitcherOpen: boolean;
   setSection: (section: SectionId) => void;
+  setCommandPaletteOpen: (open: boolean) => void;
   toggleCommandPalette: () => void;
   setCommandPaletteSearch: (search: string) => void;
   setSelectedPaletteIndex: (index: number) => void;
+  setConsoleOpen: (open: boolean) => void;
   toggleConsole: () => void;
+  setSidebarCollapsed: (collapsed: boolean) => void;
   toggleSidebar: () => void;
+  setCompanySwitcherOpen: (open: boolean) => void;
   toggleCompanySwitcher: () => void;
   navigateTo: (section: SectionId, entityId?: string) => void;
 }
@@ -37,6 +41,14 @@ export const createNavigationSlice: StateCreator<
     set((state) => {
       state.section = section;
     }),
+  setCommandPaletteOpen: (open) =>
+    set((state) => {
+      state.commandPaletteOpen = open;
+      if (!open) {
+        state.commandPaletteSearch = "";
+        state.selectedPaletteIndex = 0;
+      }
+    }),
   toggleCommandPalette: () =>
     set((state) => {
       state.commandPaletteOpen = !state.commandPaletteOpen;
@@ -54,14 +66,26 @@ export const createNavigationSlice: StateCreator<
     set((state) => {
       state.selectedPaletteIndex = index;
     }),
+  setConsoleOpen: (open) =>
+    set((state) => {
+      state.consoleOpen = open;
+    }),
   toggleConsole: () =>
     set((state) => {
       state.consoleOpen = !state.consoleOpen;
     }),
+  setSidebarCollapsed: (collapsed) =>
+    set((state) => {
+      state.sidebarCollapsed = collapsed;
+    }),
   toggleSidebar: () =>
     set((state) => {
       state.sidebarCollapsed = !state.sidebarCollapsed;
     }),
+  setCompanySwitcherOpen: (open) =>
+    set((state) => {
+      state.companySwitcherOpen = open;
+    }),
   toggleCompanySwitcher: () =>
     set((state) => {
       state.companySwitcherOpen = !state.companySwitcherOpen;