Solution: fix: align analytics with real meeting and action item data

[TFGSUMIT]

"Align analytics with real meeting and action item data

This PR addresses the issue of aligning analytics with real meeting and action item data by implementing a robust validation and data transformation process. The key changes include:

• Defining expected meeting and action item shapes
• Transforming action item data to match expected shape
• Improving fallback rules for duration calculation
• Adding defensive handling for partial or malformed meeting payloads

Testing instructions:

• Verify that analytics computations are accurate and reliable
• Test that partial or malformed meeting payloads are handled correctly

To test this PR, follow these steps:

1. Run the application with the updated code
2. Verify that analytics computations are accurate and reliable
3. Test that partial or malformed meeting payloads are handled correctly

By merging this PR, we can ensure that analytics computations are based on consistent and accurate data, providing a seamless user experience for users."

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