fix: Shift-H/L also exit the editor in vim normal mode

The previous version only handled Shift-H/L when focus was outside
the editor; inside vim normal mode they were viewport top/bottom
and required Esc+Tab to escape. Now Vim.mapCommand overrides H/L
in normal-mode context to call the same moveFocus(±1) helper, so
the shortcut works uniformly regardless of focus position.

CHANGELOG.md

@@ -9,7 +9,7 @@ Versioning: [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
 ### Added
 - Vim bindings in the input via CodeMirror 6 + `@replit/codemirror-vim` (loaded from esm.sh, no build step). Supports `i`/`Esc`, `hjkl`, word/line motions, `dd`/`yy`/`p`, undo/redo, `/` search, `:` command line. Auto-disabled on touch devices (detected via `(pointer: coarse)`) where modal editing fights the virtual keyboard.
-- `Shift-H` / `Shift-L` cycle focus across the page controls (source → target → model → editor → button) like `Shift-Tab` / `Tab`. Suppressed inside the editor where vim already owns those motions.
+- `Shift-H` / `Shift-L` cycle focus across the page controls (source → target → model → editor → button) like `Shift-Tab` / `Tab`. Also overridden in vim normal mode (replacing vim's viewport-top/bottom default) so the same shortcut works to leave the editor.
 - On page load, the model dropdown defaults to whichever model Ollama already has hot — skips the 5-15 s disk-reload pain on the first translation. After load it follows the user's manual selection.
 
 ### Changed