feat: Phase 10 - UI Notifications (request-only)

Implement visual feedback for MCP tool calls with configurable notifications.

Features:
- Real-time notifications when tools are called (request only, no completion)
- Tool-specific emoji icons for visual clarity
- Rate limiting (max 10 notifications/second)
- Notification history tracking (last 100 entries)
- Configurable settings: enable/disable, show parameters, duration, console logging
- History modal with filtering and export to clipboard

Implementation:
- Created NotificationManager with queue-based rate limiting
- Created NotificationHistoryModal for viewing past tool calls
- Integrated into tool call interceptor in ToolRegistry
- Added notification settings UI section
- Added 'View MCP Notification History' command

Benefits:
- Visual feedback for debugging and monitoring
- Transparency into AI agent actions
- Simple on/off toggle, no complex verbosity settings
- Zero performance impact when disabled
- History tracks success/failure/duration for all calls

All 10 phases of the roadmap are now complete\!

src/server/mcp-server.ts

@@ -11,6 +11,7 @@ import {
 } from '../types/mcp-types';
 import { MCPServerSettings } from '../types/settings-types';
 import { ToolRegistry } from '../tools';
+import { NotificationManager } from '../ui/notifications';
 import { setupMiddleware } from './middleware';
 import { setupRoutes } from './routes';
 
@@ -141,4 +142,11 @@ export class MCPServer {
 	public updateSettings(settings: MCPServerSettings): void {
 		this.settings = settings;
 	}
+
+	/**
+	 * Set notification manager for tool call notifications
+	 */
+	public setNotificationManager(manager: NotificationManager | null): void {
+		this.toolRegistry.setNotificationManager(manager);
+	}
 }