* feat(app): add sidebar help and support menu
Give users a single place to run diagnostics, find shortcuts, and reach the support channels. Share one global diagnostic sheet between Settings and the sidebar so both entry points collect the same report.
* fix(app): keep cloned workspace navigation atomic
A newly merged clone flow still used the previous navigation signature and opened its draft tab separately. Route the cloned workspace and its draft target through the unified navigation command so attention selection cannot replace the intended tab.
* test(app): harden sidebar help coverage
Accept both the Discord invite URL and its canonical redirect, assert placement through real element geometry, and remove an unnecessary diagnostic-host callback.
* test(app): cover support redirect variants
Keep the help-menu E2E stable across prerelease versions and the valid redirect forms returned by Discord and GitHub.
* 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
