Uses simple-datatables (vanilla JS, no jQuery needed) on the Users,
Sessions, Email Log, and Feedback tables, since those grow with real
usage. Left Games (small, admin-curated) and Hints (row order is
meaningful - "checked in order" - a sortable column would mislead)
untouched.
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
The sidebar was a fixed 220px flex column that left barely any room
for content on a phone, and tables had no min-width so columns just
squeezed into unreadable slivers instead of scrolling.
Moves the sidebar's layout rules out of inline styles (which media
queries can't override) into real CSS classes, and collapses it into
a horizontally-scrollable pill bar below 768px so the content area
gets the full screen width. Tables now get a sensible min-width so
they scroll horizontally on narrow screens instead of squishing, and
the per-player tab bar on the session log view scrolls too.
