feat: Add file size validation for media uploads

[nino-chavez]

Summary

• Adds pre-upload file size validation before media processing begins
• Enforces size limits by media type:
  • Images: 50MB
  • Videos: 4GB
  • Audio: 500MB
• Shows clear error messages with actual file size and limit (e.g., "video.mp4 (5.2 GB) exceeds the 4.00 GB limit for video files")
• Rejects oversized files immediately, preventing browser crashes and storage issues

Test plan

• Upload an image larger than 50MB → should show error and reject
• Upload a video larger than 4GB → should show error and reject
• Upload an audio file larger than 500MB → should show error and reject
• Upload files within limits → should process normally
• Verify error message shows correct file size and limit

Closes #653

🤖 Generated with Claude Code

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