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/types/settings-types.ts

@@ -7,7 +7,14 @@ export interface MCPServerSettings {
 	enableAuth: boolean;
 }
 
-export interface MCPPluginSettings extends MCPServerSettings {
+export interface NotificationSettings {
+	notificationsEnabled: boolean;
+	showParameters: boolean;
+	notificationDuration: number; // milliseconds
+	logToConsole: boolean;
+}
+
+export interface MCPPluginSettings extends MCPServerSettings, NotificationSettings {
 	autoStart: boolean;
 }
 
@@ -17,5 +24,10 @@ export const DEFAULT_SETTINGS: MCPPluginSettings = {
 	allowedOrigins: ['*'],
 	apiKey: '',
 	enableAuth: false,
-	autoStart: false
+	autoStart: false,
+	// Notification defaults
+	notificationsEnabled: false,
+	showParameters: false,
+	notificationDuration: 3000,
+	logToConsole: false
 };