- .cm-editor pinned to font-size 1rem so the input matches the
output pane (CodeMirror 6 defaults smaller)
- refreshLoaded(isInitial=true) on first load picks the hot model
as the dropdown default — avoids the 5-15s disk reload on the
first translation. Subsequent refreshes don't override the user's
manual selection.
- document-level Shift-H / Shift-L cycle focus across controls
(source → target → model → editor → button), suppressed when
focus is inside CodeMirror so vim's viewport H/L still work.
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