feat: Add resolution fallback support to download API

[Balamurugan-Testpress]

• Enable optional fallback when the requested resolution is unavailable
• Select the closest available resolution when fallback is enabled
• Prefer the lower resolution if multiple options are equally close

[gemini-code-assist]

Summary of Changes

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This pull request enhances the download API by introducing a robust resolution fallback mechanism. It allows clients to specify whether the system should attempt to find an alternative resolution if the exact requested one is unavailable, ensuring a more resilient download experience. The new logic intelligently selects the closest available resolution, with a preference for lower resolutions in case of a tie, improving flexibility and user experience for content downloads.

Highlights

• Resolution Fallback: Introduced an optional 'allowResolutionFallback' parameter to the download API, enabling the system to find an alternative resolution if the requested one is not available.
• Closest Resolution Selection: Implemented logic to automatically select the closest available video resolution when fallback is enabled and the exact requested resolution is not found.
• Tie-breaking Preference: When multiple resolutions are equally close to the requested one, the system now prefers the lower resolution to optimize for download size or compatibility.

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Changelog

• Source/Database/TPStreamsDownloadManager.swift
  • Added 'allowResolutionFallback' parameter to the 'startDownload' method.
  • Introduced 'selectQuality' and 'parseResolution' helper methods to handle resolution selection and parsing.
  • Modified the 'startDownload' method to utilize the new 'selectQuality' function for determining the appropriate video quality.

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[gemini-code-assist]

Code Review

This pull request introduces a valuable feature for resolution fallback when downloading videos. A security audit found no significant vulnerabilities (Medium, High, or Critical) related to the new resolution fallback logic, data flow from untrusted inputs, or potential Swift pitfalls. The implementation is well-structured, and I've provided suggestions in TPStreamsDownloadManager.swift to improve the efficiency and robustness of the resolution selection logic, specifically regarding redundant parsing and handling complex resolution string formats.