Changes client information and access tokens to use server-specific keys in sessionStorage. This fixes issues where changing the server URL would try to use tokens from a different server.
* In App.tsx
- added subscribeToResource()
- takes a uri
- sends a `resources/subscribe` message with the uri
- added unsubscribeFromResource()
- takes a uri
- sends a `resources/unsubscribe` message with the uri
- in ResourcesTab element,
- pass subscribeToResource and subscribeToResource invokers to component
* In notificationTypes.ts
- add ServerNotificationSchema to NotificationSchema to permit server update messages.
* In ResourcesTab.tsx
- deconstruct subscribeToResource and unsubscribeFromResource and add prop types
- Add Subscribe and Unsubscribe buttons to selected resource panel, left of the refresh button. They call the sub and unsub functions that came in on props, passing the selected resource URI.
- [WIP]: Will show the appropriate button in a follow up commit.
* In useConnection.ts
- import ResourceUpdatedNotificationSchema
- in the connect function,
- set onNotification as the handler for ResourceUpdatedNotificationSchema
- Move completion logic from App.tsx to useConnection hook
- Replace useCompletion with simpler useCompletionState hook
- Add graceful fallback for servers without completion support
- Improve error handling and state management
- Update PromptsTab and ResourcesTab to use new completion API
- Add type safety improvements across completion interfaces
- Create useDraggablePane hook for history pane drag behavior
- Create useConnection hook for MCP client connection and requests
- Update App.tsx to use both hooks
