Disable Gemini CLI colors for terminal background compatibility

NO_COLOR=1 produces monochrome output that looks correct on both light
(RStudio) and dark (JupyterLab, VSCode) terminal backgrounds.

Made-with: Cursor

Author: michaelxiao7

features/src/workbench-tools/install.sh

@@ -197,7 +197,7 @@ chown -R "${USERNAME}:" "${LIBRARIES_ENV_DIR}"
 
     # Wrap gemini to set NO_BROWSER=1 per-invocation to force device code flow
     # instead of opening a browser window.
-    printf 'function gemini() { NO_BROWSER=1 command gemini "$@"; }\n'
+    printf 'function gemini() { NO_BROWSER=1 NO_COLOR=1 command gemini "$@"; }\n'
 } >> "${USER_HOME_DIR}/.bashrc"
 
 # Allow .bashrc to be sourced in non-interactive shells