T-163. Up/Down walk previously-sent prompts, Claude-CLI-style: Up steps
to older entries only once the caret is on the first line (so multi-line
edits move line-by-line first), Down returns toward newer ones and, past
the newest, restores the in-progress draft that was stashed on entry.
History is per-session, owned by the pane (appended on submit, deduping
immediate repeats) and read by the composer. Previewing entries is
suppressed from the draft report, so browsing history never overwrites
the persisted draft (T-228) — and a remount mid-browse restores the real
draft, not a preview. History nav only applies when the slash typeahead
is closed; Up/Down still drive the typeahead when it's open.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
jpmschweitzerandClaude Opus 4.8
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