Fix duplicate upload notifications for collection track publishes

[cursor]

Summary

• Ensure collection (playlist/album) child tracks are explicitly marked as playlist uploads before publish.
• Preserve is_playlist_upload through web upload metadata adaptation and SDK upload schema parsing.
• Prevent backend create track notifications from fanning out for each child track in collection upload retries.

Changes

• packages/common/src/api/tan-query/upload/usePublishCollection.ts: set metadata.is_playlist_upload = true when composing child track metadata for collection uploads.
• packages/common/src/adapters/track.ts: include is_playlist_upload in trackMetadataForUploadToSdk() output.
• packages/sdk/src/sdk/api/tracks/types.ts: add isPlaylistUpload to UploadTrackMetadataSchema so strict parsing keeps the field.

Notes

• Root cause traced to missing propagation of is_playlist_upload; discovery-provider trigger logic only suppresses per-track create notifications when this field is true.
• Targeted tests were not runnable in this environment because vitest is not available in the package runtime path.

  

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