v3.0.0 — Navigation overhaul, Work view, and multi-account support

This release is a major feature and polish update spanning 18 commits.

Highlights:
- New Work view: unified inbox and assigned-ticket queue in one place
- Multi-account support: switch between accounts without leaving the app
- Multi-pin support: pin multiple projects to the Home dashboard
- Power user actions: quick actions accessible from key surfaces
- Projects: list view, detail view, and Home pinning
- Repository management: ACL management, settings editing
- Ticket improvements: label management, bulk actions, saved filters, label filtering
- Inbox improvements: better reply flow, basic threading, improved patch/diff rendering
- Build improvements: auto-refresh, repo filtering by tag, artifact listing, log search and jump-to-error
- Search: repository and build search with recent query history
- Display: theme options and high-density display mode