Feat: Add comprehensive error handling, logging, and security

[kartikkapri]

This pull request significantly enhances the core application's stability and robustness by overhauling its error handling and security. The changes make the application more resilient and easier to debug.

Here's a summary of the key improvements:

Enhanced Error Handling: Implemented comprehensive try-except blocks around critical operations to prevent the application from crashing due to unexpected errors.

New Logging System: Integrated a proper logging system to capture errors and application flow, which will make future debugging much more efficient.

Safe Secret Access: The application now gracefully handles missing API keys or other configuration variables without failing.

Improved Modularity: Refactored the core code in improved_main_app.py for better organization, readability, and maintainability.

Fallback Navigation: Added mechanisms to prevent complete application failure, ensuring a more stable user experience.

Note to reviewers 📄
This PR focuses on making the core application more production-ready by addressing critical failure points. The primary goal is to increase stability and make future debugging more efficient through the new logging system. All changes are contained within the improved_main_app.py file to ensure they are easy to review.

[github-actions]

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[Avdhesh-Varshney]

@kartikkapri Thanks for raising this PR and for your work.
But It's not being approved because streamlit is having well structured importing system of env variables and error handling.
And Before raising the PR, first raise the issue and wait for assign.

Keep Hacking 🧑‍💻