feat(ui): add Ctrl/Cmd+L to send selected text to chat

Bind mod+l to append the current selection into the chat composer
(Cursor-style), and move session sidebar toggle to mod+alt+l so desktop
menus stay in sync. Closes #208.

Co-authored-by: Serhii Dziupin <makeittech@users.noreply.github.com>

packages/ui/src/lib/shortcuts.ts

@@ -159,8 +159,15 @@ const SHORTCUT_ACTIONS: ReadonlyArray<ShortcutAction> = [
     description: 'Toggle the files panel',
   },
   {
-    id: 'toggle_sidebar',
+    id: 'add_selection_to_chat',
     defaultCombo: 'mod+l',
+    label: 'Add selection to chat',
+    description: 'Add the selected text to the chat input',
+    customizable: true,
+  },
+  {
+    id: 'toggle_sidebar',
+    defaultCombo: 'mod+alt+l',
     label: 'Toggle sidebar',
     description: 'Toggle the session sidebar',
     customizable: true,