Fix macOS menu bar status-item storms during rapid gateway connection churn by removing stale SwiftUI-vended status items before adopting replacements and debouncing transient control-channel states.
Surface: macOS menu bar app, `MenuBarExtra` status item ownership, `ControlChannel` UI-observed connection state.
Proof:
- `git diff --check origin/main...pr/82739`
- `swift test --package-path apps/macos --filter ControlChannelStateDebouncerTests`
- PR CI: preflight, security-fast, macos-node, macos-swift, dependency-guard, changed-path scan, real behavior proof, Socket checks
Co-authored-by: Alexander Falk <al@falk.us>
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