chore(sync): sync qwen-code desktop updates

[DragonnZhang]

Sync latest qwen-code packages/desktop progress into OpenWork via the openwork-desktop-sync skill (commit-by-commit path migration, base origin/main @ v0.1.0).

Migrated commits

OpenWork commit	Source (qwen-code)
ci(desktop): mac code-signing + App Store Connect API-key notarization	963fc543d (#5013)
docs(desktop): use main for brand builder skill	3c55295f6 (#5021)
perf(desktop): add --cli-only flag to skip non-CLI packages during vendor build	5121c6563 (#5025)
fix(desktop): isolate update feed from CLI releases	a969c8462 (#5139)
feat(desktop): show git branch in working directory badge	a629dd0ab (#5082)

Notes

• Skipped 04412163a (fix(desktop): allow unsigned Windows auto-updates, #5028) — already synced in [codex] Sync qwen-code desktop release updates #29.
• Version bump declined: qwen-code's chore(release): desktop-v0.0.4 (ee8fb8001) only bumped package.json versions. OpenWork keeps its own release version (0.1.0); recorded as an empty marker commit carrying the Qwen-Code-Commit trailer so future syncs skip it instead of re-conflicting.
• README.md overlay preserved (target-owned, not migrated).

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