chore(release): release Buzz Desktop version 0.4.1

[wpfleger96]

Buzz Desktop release v0.4.1

Changes since v0.4.0:

• feat(desktop): auto-restart setup-mode agents after adapter install, badge drift fallback (#1786) (11a286b9a)
• Retain a stable message window in channel timelines (#1698) (b0ad2b66d)
• refactor(desktop): remove legacy persona-card flows (#1781) (1fa91f569)
• Serialize managed agent PATH tests (#1777) (1fc7488ea)
• fix(desktop): stable inbox selection and scroll/draft preservation (#1760) (7e3252ea3)
• feat(desktop): add buzz-agent-snapshot v1 export, import, sender-native send, and recipient card/import (#1753) (1580046b3)
• refactor(desktop): remove vestigial MCP toolsets config (#1776) (dfec75b3c)
• feat(desktop): add key backup and agent defaults to onboarding, make avatar optional (#1767) (d2e87e1ca)
• fix(desktop): correct provider and model handling in agent config dialogs (#1764) (f3319dd11)
• fix(desktop): cascade persona deletes and restart agents on global config save (#1766) (7c346d7f8)
• fix(desktop): make doctor installs retryable with per-runtime progress and auth status (#1765) (25bb71475)
• fix(codex): swap to @agentclientprotocol/codex-acp 1.x + detect outdated adapter (#1750) (6d1a77e49)
• fix(desktop): show thread replies loader (#1773) (e07e02c0e)
• fix(desktop): restore multi-image mosaic galleries (#1769) (2c41e9e6b)
• Group channel membership events (#1713) (5dc70bd0b)
• Fix desktop launch motion and reaction spacing (#1717) (89e2e2e4a)
• fix(desktop): align sidebar search across themes (#1712) (53c177e34)
• fix(desktop): Buzz theme flicker, white bar & accent-picker motion (#1681) (5e15a588e)
• feat(desktop): surface Team Instructions as distinct observer section (#1759) (56d822dc2)
• fix(desktop): separate system prompt from turn context (#1754) (84ec63aa2)
• fix(desktop): preserve archived observer history (#1752) (51234bd89)
• fix(desktop): surface codex config-parse failures and -32603 internal errors clearly (#1745) (ec3762552)
• fix(desktop): fix workspace rail badge disappearance and persist mark-as-unread (#1747) (e8df6ba69)
• chore(desktop): remove container-only npm-preflight E2E harness (#1749) (9895b4d39)
• fix(desktop): preflight npm prefix writability in doctor installs (#1732) (58aee8f91)
• fix(workspaces): exclude muted channels and unfollowed threads from rail unread badge (#1738) (ea1c75b0d)
• feat(desktop): add explicit Edit avatar CTA in agent instance edit dialog (#1736) (26966aace)
• fix(observer): order system prompt below current-session divider on restart (#1734) (67a2d047e)

To release: merge this PR. The tag and build will happen automatically.