- Replace the plain <textarea> with a CodeMirror 6 EditorView that
has @replit/codemirror-vim attached. Loaded from esm.sh, so no
build step — finrod stays no-bundler.
- vim() extension is conditionally omitted on coarse-pointer devices
(phones, tablets) where modal editing without a hardware Esc key
is unusable and IME composition fights the keymap.
- Ctrl-/Cmd-Enter shortcut and the typing-debounce that refreshes
the "Hot:" indicator both migrate to CodeMirror's keymap and
updateListener APIs respectively.
- Editor styled to match the existing .output pane.
CHANGELOG: note under [Unreleased].
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