Buzz Desktop v0.4.3

• Stabilize persona and stream end-to-end tests (#1865) (916de4e4d)
• refactor(clients): standardize product naming on community (#1858) (3e76481a1)
• fix(desktop): retain live rows after window exhaustion (#1810) (fa6f4819b)
• Add private product feedback sidecar (#1857) (af190c93e)
• fix(desktop): resolve Doctor install shell and command detection on Windows (#1854) (1aec7ea7a)
• fix(desktop): navigate to channel from inbox thread header (#1847) (ff11f26bc)
• feat(desktop): surface needsRestart badge on live UI surfaces (#1853) (b1d323c4e)
• fix(desktop): prevent menu-to-dialog UI lockups (#1839) (7f81d93eb)
• feat(desktop): add conversation-style DM composer (#1768) (bb9d9b0c0)
• feat(push): add public APNs gateway (#1770) (1c006822e)
• fix(desktop): stabilize agent identity restore (#1831) (3370cd083)
• fix(observer): align scroll-anchor ids with transcript display-block keys (#1849) (1df4a4e77)
• [codex] Add view activity label to agent popover (#1748) (458c7f915)
• ci(desktop): surface flaky E2E tests instead of retry-masking them (#1838) (a65340630)
• fix(desktop): treat channel creator as member before 39002 provisioning (#1830) (7e62a25af)