fix: use Gemini API supported image formats for clipboard

[jackwotherspoon]

Summary

Updates clipboard image handling to only use formats supported by the Gemini API.

Changes:

• Remove TIFF and GIF from clipboard save formats (not supported by Gemini API)
• Export IMAGE_EXTENSIONS constant for reuse across clipboard utilities
• Refactor cleanupOldClipboardImages to use the shared constant

Supported formats: PNG, JPEG, WEBP, HEIC, HEIF

Reference: https://ai.google.dev/gemini-api/docs/image-understanding#supported-formats

Related Issues

Part 1 of breaking up #14706 into smaller chunks

How to Validate

Pre-Merge Checklist

• Updated relevant documentation and README (if needed)
• Added/updated tests (if needed)
• Noted breaking changes (if any)
• Validated on required platforms/methods:
  • MacOS
    • npm run
    • npx
    • Docker
    • Podman
    • Seatbelt
  • Windows
    • npm run
    • npx
    • Docker
  • Linux
    • npm run
    • npx
    • Docker

[gemini-code-assist]

Summary of Changes

Hello @jackwotherspoon, 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 refines the application's clipboard image handling to strictly adhere to the image formats supported by the Gemini API. By removing unsupported formats and centralizing the definition of acceptable extensions, the change aims to prevent potential compatibility issues and streamline image processing for API interactions.

Highlights

• Clipboard Image Format Restriction: Removed TIFF and GIF from the list of image formats saved from the clipboard, as these are not supported by the Gemini API.
• New Constant for Image Extensions: Introduced and exported an IMAGE_EXTENSIONS constant, listing all image formats supported by the Gemini API (PNG, JPEG, WEBP, HEIC, HEIF), for consistent reuse across clipboard utilities.
• Refactored Cleanup Utility: Updated the cleanupOldClipboardImages function to utilize the newly defined IMAGE_EXTENSIONS constant, ensuring that only relevant image files are considered for cleanup.

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[gemini-code-assist]

Code Review

This pull request updates clipboard image handling to align with formats supported by the Gemini API. The changes correctly remove unsupported formats (TIFF, GIF) and refactor the cleanup logic to use a new shared constant for image extensions. My review highlights two main points: a misleading comment in saveClipboardImage that lists formats not actually handled, and a change in cleanupOldClipboardImages that stops it from cleaning up legacy format files, which could lead to orphaned files.

[github-actions]

Size Change: -11 B (0%)

Total Size: 21.6 MB

ℹ️ View Unchanged

Filename	Size	Change
./bundle/gemini.js	21.5 MB	-11 B (0%)
./bundle/sandbox-macos-permissive-closed.sb	1.03 kB	0 B
./bundle/sandbox-macos-permissive-open.sb	890 B	0 B
./bundle/sandbox-macos-permissive-proxied.sb	1.31 kB	0 B
./bundle/sandbox-macos-restrictive-closed.sb	3.29 kB	0 B
./bundle/sandbox-macos-restrictive-open.sb	3.36 kB	0 B
./bundle/sandbox-macos-restrictive-proxied.sb	3.56 kB	0 B

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