Removed the dead .sidebar nav block (replaced by the kit's .side-rail shell) and
the orphaned .dashboard-login/.login-card rules (the /login page now uses the
kit's <LoginCard>). Kept .app-bar (still used by the /denied page header) and the
.chip white-space override (emitted by StatusPill); corrected the now-stale
app-bar comment. 106 lines removed; builds clean.
Adds missing <summary>/<param> XML docs across 99 server, worker, and test
files so CommentChecker reports zero issues (TreatWarningsAsErrors needs the
analyzer clean). Bundles in WIP dashboard work: NavSection extraction,
MainLayout/site.css/js styling alignment, and DashboardOptions/Auth tweaks.