Matt 3b227fe9b2 feat(files): in-app .docx preview + allow office/text mimes ...

- .docx now renders client-side via docx-preview (fetches bytes from our
  own storage; works with private MinIO/disk). Drops Microsoft's hosted
  Office viewer which can't reach a private object store.
- add office (.docx/.doc/.xlsx/.xls) + text/csv to PREVIEWABLE_MIMES so
  /api/v1/files/[id]/preview returns a URL instead of rejecting them
  (was surfacing as a misleading "Failed to load preview")
- legacy .doc + spreadsheets fall through to a download CTA (can't render
  client-side); text/csv use the existing TextPreview

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

2026-06-03 15:45:11 +02:00

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