Add ability to download srt and txt

[xcv58]

Add ability to download srt and txt, screenshots:

Sample files:
result_20251212_233406.txt

result_20251212_233406.srt.txt (the .txt is manually added since GitHub doesn't allow .srt file)

[gemini-code-assist]

Summary of Changes

Hello @xcv58, 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 enhances the user experience by introducing the ability to download the generated transcription results. Users can now easily obtain both the plain text recognition output and the SRT subtitle file directly from the application's interface, streamlining the workflow for accessing and utilizing the processed content.

Highlights

• New File Saving Utility: A new utility function, save_text_to_file, has been introduced to handle the saving of text content (like transcription results) to files with a timestamped filename, either in a specified output directory or a temporary location.
• Integration with Recognition Functions: The mix_recog and mix_recog_speaker functions have been updated to utilize the new save_text_to_file utility, ensuring that both plain text and SRT subtitle content are saved to files after processing.
• Gradio UI Enhancements: Two new gr.File components have been added to the Gradio interface, providing users with direct download links for the generated .txt (recognition result) and .srt (subtitle) files.
• Updated Event Handlers: The Gradio event handlers for the recognition buttons (recog_button and recog_button2) have been modified to return the paths of the newly saved text and SRT files, populating the new download components in the UI.

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[gemini-code-assist]

Code Review

The pull request introduces a new save_text_to_file utility function to automatically save recognition results (text and SRT) with timestamps, either to a specified output directory or a temporary location, and integrates this into the Gradio UI to provide downloadable links for these files. A review comment suggests improving the save_text_to_file function by creating the output_dir if it's specified but doesn't exist, rather than silently falling back to a temporary directory, to ensure more robust behavior consistent with other parts of the codebase.