Ported from app.js's `renderTermInput`/`handleSlashCommand`/
`completeSlash`: prompt + auto-growing textarea, Enter sends (Shift+Enter
newline), Tab cycles slash-command completion. Same command set
(/help, /clear, /cancel, /compact, /model, /effort, /new-session,
/logout), same routes (`api/cancel`, `api/compact`, `api/new-session`,
`api/logout`, `send`) via new `lib/termActions.ts` (same `{ok, detail}`
shape as modelEffort.ts's POST helper).
One deliberate UX change: `/new-session` and `/logout` used to pop the
old shadow-DOM `themedConfirm` modal before firing — this rewrite's
destructive actions all avoid that widget family already (SidePanel,
useConfirmClick), and a modal doesn't fit a text-input flow anyway.
Typing the command once arms it (a local note explains what confirming
does); typing it again fires it — a keyboard-native two-step confirm.
`/help`/`/clear` need to reach into LiveStream's row list (local-only
echo rows, never sent anywhere) without lifting that state up to Root —
`useLiveStream` gained `pushLocalNote`/`clearLocal`, exposed off
`LiveStream` via `forwardRef`+`useImperativeHandle` (preact/compat),
same shape as app.js's old `termAPI` object but scoped as a ref handle
instead of a module-level variable.
Screenshot-verified end to end: typed "/help" + Enter into a real
mounted composer, confirmed the textarea clears and the local note rows
(command list) append to the live pane.
d9249a36bf