Add shortcuts hint and panel for discoverability (#18035)

packages/cli/src/ui/hooks/slashCommandProcessor.ts

@@ -83,6 +83,7 @@ interface SlashCommandProcessorActions {
   dispatchExtensionStateUpdate: (action: ExtensionUpdateAction) => void;
   addConfirmUpdateExtensionRequest: (request: ConfirmationRequest) => void;
   toggleBackgroundShell: () => void;
+  toggleShortcutsHelp: () => void;
   setText: (text: string) => void;
 }
 
@@ -240,6 +241,7 @@ export const useSlashCommandProcessor = (
         setConfirmationRequest,
         removeComponent: () => setCustomDialog(null),
         toggleBackgroundShell: actions.toggleBackgroundShell,
+        toggleShortcutsHelp: actions.toggleShortcutsHelp,
       },
       session: {
         stats: session.stats,