feat: launch Gemini 3 in Gemini CLI 🚀🚀🚀 (in main) (#13287)

Co-authored-by: Adam Weidman <65992621+adamfweidman@users.noreply.github.com>
Co-authored-by: Sehoon Shon <sshon@google.com>
Co-authored-by: Adib234 <30782825+Adib234@users.noreply.github.com>
Co-authored-by: Sandy Tao <sandytao520@icloud.com>
Co-authored-by: Abhi <43648792+abhipatel12@users.noreply.github.com>
Co-authored-by: Aishanee Shah <aishaneeshah@gmail.com>
Co-authored-by: gemini-cli-robot <gemini-cli-robot@google.com>
Co-authored-by: Gal Zahavi <38544478+galz10@users.noreply.github.com>
Co-authored-by: Jacob Richman <jacob314@gmail.com>
Co-authored-by: joshualitt <joshualitt@google.com>
Co-authored-by: Jenna Inouye <jinouye@google.com>

packages/cli/src/ui/AppContainer.tsx

@@ -181,6 +181,10 @@ export const AppContainer = (props: AppContainerProps) => {
     null,
   );
 
+  const [defaultBannerText, setDefaultBannerText] = useState('');
+  const [warningBannerText, setWarningBannerText] = useState('');
+  const [bannerVisible, setBannerVisible] = useState(true);
+
   const extensionManager = config.getExtensionLoader() as ExtensionManager;
   // We are in the interactive CLI, update how we request consent and settings.
   extensionManager.setRequestConsent((description) =>
@@ -596,6 +600,7 @@ Logging in with Google... Please restart Gemini CLI to continue.
     slashCommandActions,
     extensionsUpdateStateInternal,
     isConfigInitialized,
+    setBannerVisible,
     setCustomDialog,
   );
 
@@ -1305,6 +1310,38 @@ Logging in with Google... Please restart Gemini CLI to continue.
     };
   }, []);
 
+  useEffect(() => {
+    let isMounted = true;
+
+    const fetchBannerTexts = async () => {
+      const [defaultBanner, warningBanner] = await Promise.all([
+        config.getBannerTextNoCapacityIssues(),
+        config.getBannerTextCapacityIssues(),
+      ]);
+
+      if (isMounted) {
+        setDefaultBannerText(defaultBanner);
+        setWarningBannerText(warningBanner);
+        setBannerVisible(true);
+        refreshStatic();
+        const authType = config.getContentGeneratorConfig()?.authType;
+        if (
+          authType === AuthType.USE_GEMINI ||
+          authType === AuthType.USE_VERTEX_AI
+        ) {
+          setDefaultBannerText(
+            'Gemini 3 is now available.\nTo use Gemini 3, enable "Preview features" in /settings\nLearn more at https://goo.gle/enable-preview-features',
+          );
+        }
+      }
+    };
+    fetchBannerTexts();
+
+    return () => {
+      isMounted = false;
+    };
+  }, [config, refreshStatic]);
+
   const uiState: UIState = useMemo(
     () => ({
       history: historyManager.history,
@@ -1394,6 +1431,11 @@ Logging in with Google... Please restart Gemini CLI to continue.
       customDialog,
       copyModeEnabled,
       warningMessage,
+      bannerData: {
+        defaultText: defaultBannerText,
+        warningText: warningBannerText,
+      },
+      bannerVisible,
     }),
     [
       isThemeDialogOpen,
@@ -1482,6 +1524,9 @@ Logging in with Google... Please restart Gemini CLI to continue.
       authState,
       copyModeEnabled,
       warningMessage,
+      defaultBannerText,
+      warningBannerText,
+      bannerVisible,
     ],
   );
 
@@ -1519,6 +1564,7 @@ Logging in with Google... Please restart Gemini CLI to continue.
       popAllMessages,
       handleApiKeySubmit,
       handleApiKeyCancel,
+      setBannerVisible,
     }),
     [
       handleThemeSelect,
@@ -1548,6 +1594,7 @@ Logging in with Google... Please restart Gemini CLI to continue.
       popAllMessages,
       handleApiKeySubmit,
       handleApiKeyCancel,
+      setBannerVisible,
     ],
   );