* fix(settings): show daemon update failures
React Native web ignores Alert.alert, so failed remote updates reset to an enabled button without any user-visible explanation. Keep updater progress and failure as explicit rendered state, including the daemon's error, and cover the real browser-to-daemon failure path.
* test(settings): harden daemon update regression
* fix(settings): disable Desktop-managed daemon updates
Desktop-bundled daemons advertised npm self-update even though the install-origin checks always rejected it. Report Desktop ownership to clients, render actionable guidance, and refuse stale requests before touching npm.
* fix(diagnostics): include desktop app logs
Settings diagnostics now collect the Electron main-process log separately from daemon.log so desktop startup and environment-probe failures are included in app reports.
* refactor(desktop): share log tail reader
* fix(diagnostics): surface desktop app log read errors
* refactor(diagnostics): tighten desktop report API
