feat(cli): Add setting to show status(or Gemini 's thoughts) in terminal title and taskbar icon (#4386)

Co-authored-by: Jacob Richman <jacob314@gmail.com>
Co-authored-by: gemini-code-assist[bot] <176961590+gemini-code-assist[bot]@users.noreply.github.com>

packages/cli/src/utils/windowTitle.ts

@@ -0,0 +1,22 @@
+/**
+ * @license
+ * Copyright 2025 Google LLC
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+/**
+ * Computes the window title for the Gemini CLI application.
+ *
+ * @param folderName - The name of the current folder/workspace to display in the title
+ * @returns The computed window title, either from CLI_TITLE environment variable or the default Gemini title
+ */
+export function computeWindowTitle(folderName: string): string {
+  const title = process.env['CLI_TITLE'] || `Gemini - ${folderName}`;
+
+  // Remove control characters that could cause issues in terminal titles
+  return title.replace(
+    // eslint-disable-next-line no-control-regex
+    /[\x00-\x1F\x7F]/g,
+    '',
+  );
+}