feat: format export timestamps as MM:SS instead of seconds

[NotYuSheng]

Change transcript export format from seconds (e.g., "65.50s") to minutes:seconds format (e.g., "1:05") for improved readability.

Suggested-by: @miguelsilv6

[gemini-code-assist]

Summary of Changes

Hello @NotYuSheng, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request significantly improves the user experience by standardizing the display of transcript timestamps in exported files. Instead of showing raw seconds, all timestamps will now be presented in a clear and intuitive 'minutes:seconds' format, making it much easier for users to quickly grasp the duration of transcript segments.

Highlights

• New Timestamp Formatting Function: A new utility function, format_timestamp, has been introduced in backend/utils/formatters.py to convert time values from raw seconds (e.g., '65.50') into a more human-readable 'MM:SS' format (e.g., '1:05').
• Improved Transcript Export Readability: The format_timestamp function is now utilized across the application to enhance the readability of exported transcript timestamps. This change affects both Markdown and PDF export formats, ensuring consistency and clarity.
• Removal of 's' Suffix: The 's' suffix previously appended to timestamps (e.g., '65.50s') has been removed from the exported formats, as the new 'MM:SS' format inherently conveys time units.

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[gemini-code-assist]

Code Review

This pull request introduces a new utility function format_timestamp to convert timestamps from seconds into a more readable MM:SS format. This new function is then consistently applied across markdown and PDF generation for transcript exports, improving the readability of timestamps. The changes are well-implemented and achieve the intended goal. I've added a couple of suggestions to the new format_timestamp function to improve its robustness and readability.