Pinneado al commit 0a88824f del upstream. Patches locales aplicados a
TextEditor.cpp para compilar contra ImGui 1.91+ (GetKeyIndex eliminado,
PushAllowKeyboardFocus/PopAllowKeyboardFocus removidos). Documentado en
cpp/vendor/imgui_text_edit/README.md.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>