* feat(ui): improve changelog and help navigation
Make release notes easier to scan and reach from the app. Also keep the homepage marquee within the layout viewport so it cannot create horizontal scrolling.
* fix(website): reject duplicate release anchors
* 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.
