chore(release): release Buzz Desktop version 0.3.43

[wesbillman]

Buzz Desktop release v0.3.43

Changes since v0.3.42:

• fix(desktop): sync agent relay profile when persona avatar changes (#1512) (ce901f7c1)
• feat(desktop): redesign appearance settings with mode-first theme picker (#1528) (9e773f103)
• fix(deps): restore windows-* crates downgraded by chrono bump (fixes Windows Rust on main) (#1532) (d40837085)
• chore(renovate): stop rebase churn between weekly sweeps (#1530) (a8238cd67)
• fix(deps): unversion isomorphic-git pnpm patch key (#1529) (2a24765fd)
• chore(deps): update dependency @tanstack/react-virtual to v3.14.5 (#1523) (b66a53f5b)
• chore(deps): update redis to v1.2.2 (#1049) (f1b29140c)
• feat(desktop): restore section icon/emoji picker (#1516) (232b6066c)
• chore(deps): update radix-ui-primitives monorepo (#1524) (dc383c199)
• fix(desktop): stop Leave-channel dialog from freezing the app (#1482) (668d30b0c)
• perf: lazy-load avatars and message images (#1517) (d09d7dea5)
• Live thread-summary push: badge counts update on reply ingest (#1521) (74a30c3de)
• chore(deps): update all non-major dependencies (#1163) (a255a7735)
• chore(deps): update rust crate anyhow to v1.0.103 (#1525) (26d609cbe)
• chore(deps): update cashapp/activate-hermit digest to cea9af7 (#1522) (19d98319a)
• chore(deps): update rust crate chrono to v0.4.45 (#1050) (3caa66d4f)
• chore(deps): update actions/cache digest to caa2961 (#1341) (8dea817fa)
• chore(deps): pin dependencies (#1162) (4b01040af)
• feat(desktop): replace placeholder icon with actual app icon on welcome screen (#1527) (5b88e5956)
• feat(desktop): enable native spellcheck in message composer (#1515) (a1b5983e5)
• fix: let agent owners delete their agent's messages (relay kind:5 + desktop/mobile UX) (#1519) (642800548)
• chore(desktop): bring ChannelScreen back under the size gate (#1520) (8174f2b0a)
• fix(zoom) desktop chrome clearance under text zoom (#1490) (ee4c9ef13)
• fix(activity panel): handle back navigation (#1487) (caf644eda)
• Port channel windows to mobile (#1518) (6716cd31a)
• perf: GIN index for e-tag containment + delta profile fetch (scroll-back ~2.1s/page) (#1514) (33886e3de)
• GUI read-model overhaul: server-assembled channel windows (Correct™ pagination + relay-signed bounds) (#1500) (62bb9fe8c)
• feat(desktop): show activity timestamps on demand (#1506) (c7a8b0bab)
• feat(reconnect): replace top banner with animated sidebar overlay (#1510) (f35aeb798)
• docs(nest-skill): explain agent-owned git repos and automatic auth (#1437) (20d3cdc22)
• fix(agent): make stop-hook rejection budget per-prompt, fix stale hook docs (#1503) (4a0951042)

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