feat: Add WebMCP token polling for automatic browser connection

- Add token API endpoint to server for storing/retrieving pending tokens
- Add token polling in frontend to auto-detect and connect with tokens
- Add xterm dependencies for terminal functionality
- Add terminal page support in toolRegistry

frontend/src/services/toolRegistry.ts

@@ -35,7 +35,7 @@ import {
   SOURCE_CODE_TOOLS
 } from './tools/sourceCodeTools'
 
-type PageName = 'home' | 'canvas' | 'components' | 'themes' | 'projects' | 'project-canvas' | 'database' | 'source'
+type PageName = 'home' | 'canvas' | 'components' | 'themes' | 'projects' | 'project-canvas' | 'database' | 'source' | 'terminal'
 
 interface PageToolSet {
   register: () => void
@@ -105,6 +105,11 @@ const pageTools: Record<PageName, PageToolSet> = {
     register: registerSourceCodeTools,
     unregister: unregisterSourceCodeTools,
     toolNames: SOURCE_CODE_TOOLS
+  },
+  terminal: {
+    register: () => {},
+    unregister: () => {},
+    toolNames: []
   }
 }