fix(types): Desktop type safety hardening (TYPE-01)

- Unify ConnectionState: kernel-types.ts now canonical source
  with 'handshaking', gateway-types.ts re-exports
- PromptTemplateInfo source/status → union literals
- PromptVariable.type → union literal
- CreateRoleRequest id/permissions → optional
- PropertyPanel: replace 13 as any with typed accessor pattern
- chatStore: window cast via as unknown as Record

desktop/src/store/chatStore.ts

@@ -354,7 +354,7 @@ if (import.meta.hot) {
 
 // Dev-only: Expose stores to window for E2E testing
 if (import.meta.env.DEV && typeof window !== 'undefined') {
-  const w = window as Record<string, unknown>;
+  const w = window as unknown as Record<string, unknown>;
   w.__ZCLAW_STORES__ = (w.__ZCLAW_STORES__ as Record<string, unknown>) || {};
   const stores = w.__ZCLAW_STORES__ as Record<string, unknown>;
   stores.chat = useChatStore;