setCustomEditorComponent() was not copying the paddingX setting from the default editor to extension-provided editors. Also propagate live changes from the settings callback.
- Add setEditorComponent() to ctx.ui for custom editor components - Add CustomEditor base class for extensions (handles app keybindings) - Add keybindings parameter to ctx.ui.custom() factory (breaking change) - Add modal-editor.ts example (vim-like modes) - Add rainbow-editor.ts example (animated text highlighting) - Update docs: extensions.md, tui.md Pattern 7 - Clean up terminal on TUI render errors