feat(domains): create domain-driven architecture for Phase 2

Chat Domain:
- Add types.ts with Message, Conversation, Agent types
- Add store.ts with Valtio-based state management
- Add hooks.ts with useChatState, useMessages, etc.
- Add index.ts for public API export

Hands Domain:
- Add types.ts with Hand, Trigger, Approval types
- Add machine.ts with XState state machine
- Add store.ts with Valtio-based state management
- Add hooks.ts with useHands, useApprovalQueue, etc.

Shared Module:
- Add types.ts with Result, AsyncResult, PaginatedResponse
- Add error-handling.ts with AppError, NetworkError, etc.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

desktop/src/domains/hands/hooks.ts

@@ -0,0 +1,79 @@
+/**
+ * Hands Domain Hooks
+ *
+ * React hooks for accessing hands state with Valtio.
+ */
+import { useSnapshot } from 'valtio';
+import { handsStore } from './store';
+import type { Hand, ApprovalRequest, Trigger, HandRun } from './types';
+
+/**
+ * Hook to access the full hands state snapshot.
+ */
+export function useHandsState() {
+  return useSnapshot(handsStore);
+}
+
+/**
+ * Hook to access hands list.
+ */
+export function useHands(): readonly Hand[] {
+  const { hands } = useSnapshot(handsStore);
+  return hands;
+}
+
+/**
+ * Hook to access a specific hand by ID.
+ */
+export function useHand(id: string): Hand | undefined {
+  const { hands } = useSnapshot(handsStore);
+  return hands.find(h => h.id === id);
+}
+
+/**
+ * Hook to access approval queue.
+ */
+export function useApprovalQueue(): readonly ApprovalRequest[] {
+  const { approvalQueue } = useSnapshot(handsStore);
+  return approvalQueue;
+}
+
+/**
+ * Hook to access triggers.
+ */
+export function useTriggers(): readonly Trigger[] {
+  const { triggers } = useSnapshot(handsStore);
+  return triggers;
+}
+
+/**
+ * Hook to access a specific run.
+ */
+export function useRun(runId: string): HandRun | undefined {
+  const { runs } = useSnapshot(handsStore);
+  return runs[runId];
+}
+
+/**
+ * Hook to check if any hand is loading.
+ */
+export function useHandsLoading(): boolean {
+  const { isLoading } = useSnapshot(handsStore);
+  return isLoading;
+}
+
+/**
+ * Hook to access hands error.
+ */
+export function useHandsError(): string | null {
+  const { error } = useSnapshot(handsStore);
+  return error;
+}
+
+/**
+ * Hook to access hands actions.
+ * Returns the store directly for calling actions.
+ */
+export function useHandsActions() {
+  return handsStore;
+}