fixed output message when apikey is not present

[yash1744]

why

solves issue #592.

what changed

Added intEnv in getBrowser method in order to know about initial environment and replaced env with intEnv for checking the environment correctly and outputting the message accordingly.

test plan

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[greptile-apps]

PR Summary

This PR refines the error handling in the getBrowser function by introducing intEnv to better determine and log the intended environment when an API key is missing.

• Updated /lib/index.ts: getBrowser now uses intEnv over the original env.
• Improved output message when operating in BROWSERBASE mode without an API key.
• Defaulting to LOCAL still occurs, so users must verify their intended environment setting.

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[kamath]

thanks so much for your contribution!