## Summary
- adopt the finalized NIP-MP project model so one project can enumerate
and switch between multiple NIP-34 repositories
- add project and repository navigation, activity summaries,
existing-repository attachment, and repository access-channel management
- preserve privacy-safe activation provenance for agent-authored
patches, pull requests, issues, and associated commits
## Test plan
- [x] Run desktop typecheck and unit tests
- [x] Run focused NIP-MP, repository access, and provenance tests
- [x] Run Rust formatting and desktop lint checks
- [x] Run the complete pre-push suite after merging current `main`
- [ ] Manually verify project creation, repository attachment,
switching, and access repair on staging
- [ ] Manually verify public-channel and private-agent origin labels on
newly created Git activity
Related: [#4695](https://github.com/block/buzz/pull/4695)
---------
Signed-off-by: Thomas Petersen <thomasp@squareup.com>
Signed-off-by: Will Pfleger <pfleger.will@gmail.com>
Co-authored-by: npub1mn7jgtj4w2pd0g0zeuhxsa6jy6p0rewxz4kujt98my82ahfmp72sxjexk7 <dcfd242e557282d7a1e2cf2e6877522682f1e5c6156dc92ca7d90eaedd3b0f95@buzz.block.builderlab.xyz>
Co-authored-by: Will Pfleger <pfleger.will@gmail.com>
## What
- morph the composer plus button into the attachment menu, camera, and
photo surfaces
- add ordered multi-select with inline recent photos and system picker
fallback
- add native iOS attachment/photo popovers and align the Android camera
treatment
## Stack
- follows #3312
## Validation
- `just mobile-check`
- `flutter test test/features/channels/compose_bar_test.dart`
- full mobile pre-push suite
---------
Signed-off-by: kenny lopez <klopez4212@gmail.com>
