scrollLines() only moves xterm.js's local scrollback buffer (outside).
WheelEvent dispatch goes through xterm.js's mouse reporting path —
if tmux mouse mode is on, escape sequences reach the PTY so tmux and
applications (vim, less, etc.) handle the scroll (inside).
Same behavior as mouse wheel on desktop.
Terminal: add touchstart/touchmove/touchend IIFE on #terminal-container.
Vertical swipe delta translated to _term.scrollLines(n). touchmove is
non-passive (required for e.preventDefault to block page scroll while
swiping inside terminal). mouse wheel scroll unaffected (separate wheel
event path in xterm.js).
Sidebar: add touch-action:pan-y + overscroll-behavior:contain to
.sidebar-list. Tells browser explicitly that vertical panning is allowed
and prevents scroll chaining when reaching list ends.