Re-skin the mobile toolbar to Google Workspace dark vocabulary
(#202124 bar, #303134 surface, #3c4043 hairlines, Roboto 12/500)
keeping #D35400 as the sethmux accent. Adds .mono / .hi / .grn
button variants with hover/active wash transitions.
Adds a compose bar (toggled by 'Type' button) — a real <input>
with autocorrect=on and enterkeyhint=send. Enter/Send/↵ flushes the
assembled string to stdin in one shot, plus \\r. Other toolbar taps
while composing flush typed text first to preserve order, but keep
the compose bar open. Sidesteps xterm.js's per-keystroke input
model that drops Gboard/iOS bulk-replacement events.
relayout() now measures bar.offsetHeight instead of hard-coding
calc(100vh - 88px) so the third row reflows the terminal correctly.
Records the design rationale and what was rejected in DECISIONS.md.
Mortdecai
8e70875631
