Feat(video): add real upload progress

[Found-L]

Summary

• support real byte-based upload progress through context.onProgress
• display individual progress and status for each video
• display overall progress weighted by uploaded bytes
• isolate upload failures so other videos can continue
• preserve the selected file order when inserting uploaded videos
• share the upload workflow between the toolbar and /video command
• keep existing upload(file) implementations backward compatible

New option

• uploadConcurrency: controls the maximum number of simultaneous uploads and defaults to 3

Upload API

upload(file, {
  onProgress: ({ loaded, total }) => {
    // Report real progress from XHR, Axios, or a storage SDK.
  },
})

[vercel]

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