feat(attachments): add heic/heif thumbnail support

[grantfitzsimmons]

Fixes #8246

Requires the server to support it, so test alongside specify/web-asset-server#44

If this branch is used with the current v2.0 asset server, it will show a broken image link:

Testing instructions

This will likely need to be developer tested, as it requires both the Specify 7 instance to be running this branch (issue-8246) and the asset server to be using branch/Docker tag issue-44.

Compare against a production instance using the latest tagged asset server.

• Upload a HEIC attachment
• Verify that a thumbnail displays
• Upload a HEIF attachment
• Verify that a thumbnail displays
• Upload at least one of each and verify thumbnails display properly:
  • GIF
  • PNG
  • TIFF
  • PDF
• Upload text files, videos, and sounds and verify all appear as expected

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro Plus

Run ID: 8865bd11-9849-40cd-8b13-747ddbb68acb

📥 Commits

Reviewing files that changed from the base of the PR and between f8f5da5 and 7772b88.

📒 Files selected for processing (1)

• specifyweb/frontend/js_src/lib/components/Attachments/attachments.ts

👮 Files not reviewed due to content moderation or server errors (1)

• specifyweb/frontend/js_src/lib/components/Attachments/attachments.ts

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📝 Walkthrough

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Walkthrough skipped

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🚥 Pre-merge checks | ❌ 2

❌ Failed checks (2 inconclusive)

Check name	Status	Explanation	Resolution
Automatic Tests	❓ Inconclusive	Custom check execution failed before a final verdict was produced.	Retry the review run. If this persists, inspect pre-merge custom-check logs for infrastructure or agent runtime failures.
Testing Instructions	❓ Inconclusive	Custom check execution failed before a final verdict was produced.	Retry the review run. If this persists, inspect pre-merge custom-check logs for infrastructure or agent runtime failures.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch issue-8246

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[CarolineDenis]

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