fix: include file extensions in client accept filters

[armancharan]

Summary

• generateMimeTypes and generateClientDropzoneAccept now emit known file extensions alongside MIME types (e.g. .jar for application/java-archive)
• Fixes #1157: Windows Chrome ignores MIME-only accept values and falls back to "All Files"
• Adds unit coverage for MIME+extension accept output and the dropzone accept attribute

Test plan

• bun run --filter @uploadthing/shared test
• bun run --filter @uploadthing/shared typecheck
• bun run --filter @uploadthing/shared lint
• On Windows Chrome: configure a route with 'application/java-archive' and confirm the file picker filters to .jar files

Made with Cursor

[changeset-bot]

🦋 Changeset detected

Latest commit: b38d1f3

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 8 packages

Name	Type
@uploadthing/shared	Patch
@uploadthing/react	Patch
@uploadthing/vue	Patch
@uploadthing/solid	Patch
uploadthing	Patch
@uploadthing/expo	Patch
@uploadthing/svelte	Patch
@uploadthing/nuxt	Patch

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