fix(terminal): address review: Key tester isolates shortcuts, Codex stays on line feed

- app.js: the shortcut dispatcher returns early for events aimed at a data-raw-keys
  field, so Ctrl+W / Ctrl+L / Escape / Alt+1 / Ctrl+K pressed in the Key tester no
  longer kill the session, clear the terminal or close Settings
- stock.ts: drop Codex's esc-enter (a line feed works); no stock CLI declares a chord.
  The esc-enter path is tested through a clis.json override
- tests: unused port (3194), Ctrl+Enter asserts no keypress, shortcut-isolation test
  (verified to fail without the guard)
- docs/comments point at capabilities.newline; set-input class, trailing whitespace

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

src/config/cli-registry/stock.ts

@@ -620,9 +620,6 @@ const CODEX: CliEntry = {
     // `dangerouslyBypassApprovals` on the wire), so it is the one that would have caught a
     // regression; `schema.ts` now rejects a name that is not a declared param.
     privilegedParams: [{ param: 'bypassApprovals', clampTo: false }],
-    // Codex's composer ignores a bare line feed in some terminals (Windows browsers, #495); the
-    // Esc+Enter chord is the one its own Option+Enter uses.
-    newline: 'esc-enter',
     // Verified by hand against a real llama.cpp server. Written to an isolated CODEX_HOME
     // so the user's real ~/.codex/config.toml is never touched.
     customModelInjection: {