feat: add custom context menus for editor and chat input

- Add EditorContextMenu for code editor with clipboard operations
  (Undo, Redo, Cut, Copy, Paste, Select All)
- Add TextInputContextMenu for chat input textarea
- Add global context menu prevention to disable default webview menu
- Add viewport boundary detection to keep menus within window bounds
- Install @codemirror/commands for undo/redo functionality

pnpm-lock.yaml

@@ -8,6 +8,9 @@ importers:
 
   .:
     dependencies:
+      '@codemirror/commands':
+        specifier: 6.8.1
+        version: 6.8.1
       '@codemirror/lang-angular':
         specifier: ^0.1.4
         version: 0.1.4
@@ -239,8 +242,8 @@ packages:
   '@codemirror/autocomplete@6.20.0':
     resolution: {integrity: sha512-bOwvTOIJcG5FVo5gUUupiwYh8MioPLQ4UcqbcRf7UQ98X90tCa9E1kZ3Z7tqwpZxYyOvh1YTYbmZE9RTfTp5hg==}
 
-  '@codemirror/commands@6.10.1':
-    resolution: {integrity: sha512-uWDWFypNdQmz2y1LaNJzK7fL7TYKLeUAU0npEC685OKTF3KcQ2Vu3klIM78D7I6wGhktme0lh3CuQLv0ZCrD9Q==}
+  '@codemirror/commands@6.8.1':
+    resolution: {integrity: sha512-KlGVYufHMQzxbdQONiLyGQDUW0itrLZwq3CcY7xpv9ZLRHqzkBSoteocBHtMCoY7/Ci4xhzSrToIeLg7FxHuaw==}
 
   '@codemirror/lang-angular@0.1.4':
     resolution: {integrity: sha512-oap+gsltb/fzdlTQWD6BFF4bSLKcDnlxDsLdePiJpCVNKWXSTAbiiQeYI3UmES+BLAdkmIC1WjyztC1pi/bX4g==}
@@ -2184,7 +2187,7 @@ snapshots:
       '@codemirror/view': 6.39.11
       '@lezer/common': 1.5.0
 
-  '@codemirror/commands@6.10.1':
+  '@codemirror/commands@6.8.1':
     dependencies:
       '@codemirror/language': 6.12.1
       '@codemirror/state': 6.5.4
@@ -3214,7 +3217,7 @@ snapshots:
   codemirror@6.0.2:
     dependencies:
       '@codemirror/autocomplete': 6.20.0
-      '@codemirror/commands': 6.10.1
+      '@codemirror/commands': 6.8.1
       '@codemirror/language': 6.12.1
       '@codemirror/lint': 6.9.3
       '@codemirror/search': 6.6.0