Add visual cues for nightly version (#3701)

Co-authored-by: Jacob Richman <jacob314@gmail.com>

packages/cli/src/ui/App.tsx

@@ -84,6 +84,7 @@ interface AppProps {
   config: Config;
   settings: LoadedSettings;
   startupWarnings?: string[];
+  version: string;
 }
 
 export const AppWrapper = (props: AppProps) => (
@@ -92,10 +93,11 @@ export const AppWrapper = (props: AppProps) => (
   </SessionStatsProvider>
 );
 
-const App = ({ config, settings, startupWarnings = [] }: AppProps) => {
+const App = ({ config, settings, startupWarnings = [], version }: AppProps) => {
   useBracketedPaste();
   const [updateMessage, setUpdateMessage] = useState<string | null>(null);
   const { stdout } = useStdout();
+  const nightly = version.includes('nightly');
 
   useEffect(() => {
     checkForUpdates().then(setUpdateMessage);
@@ -315,7 +317,7 @@ const App = ({ config, settings, startupWarnings = [] }: AppProps) => {
 ⚡ To continue accessing the ${currentModel} model today, consider using /auth to switch to using a paid API key from AI Studio at https://aistudio.google.com/apikey`;
         } else {
           // Default fallback message for other cases (like consecutive 429s)
-          message = `⚡ Automatically switching from ${currentModel} to ${fallbackModel} for faster responses for the remainder of this session.  
+          message = `⚡ Automatically switching from ${currentModel} to ${fallbackModel} for faster responses for the remainder of this session.
 ⚡ Possible reasons for this are that you have received multiple consecutive capacity errors or you have reached your daily ${currentModel} quota limit
 ⚡ To increase your limits, upgrade to a Gemini Code Assist Standard or Enterprise plan with higher limits at https://goo.gle/set-up-gemini-code-assist
 ⚡ Or you can utilize a Gemini API Key. See: https://goo.gle/gemini-cli-docs-auth#gemini-api-key
@@ -673,7 +675,11 @@ const App = ({ config, settings, startupWarnings = [] }: AppProps) => {
           key={staticKey}
           items={[
             <Box flexDirection="column" key="header">
-              <Header terminalWidth={terminalWidth} />
+              <Header
+                terminalWidth={terminalWidth}
+                version={version}
+                nightly={nightly}
+              />
               {!settings.merged.hideTips && <Tips config={config} />}
             </Box>,
             ...history.map((h) => (
@@ -931,6 +937,7 @@ const App = ({ config, settings, startupWarnings = [] }: AppProps) => {
               config.getDebugMode() || config.getShowMemoryUsage()
             }
             promptTokenCount={sessionStats.lastPromptTokenCount}
+            nightly={nightly}
           />
         </Box>
       </Box>