feat(writekit): rename @robonen/editor to @robonen/writekit

Rename the rich-text editor package and all Editor* exports to Writekit*;
remove the old vue/editor tree.

vue/writekit/src/state/command.ts

@@ -0,0 +1,25 @@
+import type { WritekitState } from './writekit-state';
+import type { Transaction } from './transaction';
+
+/** Applies a transaction, updating writekit state and notifying subscribers. */
+export type Dispatch = (tr: Transaction) => void;
+
+/**
+ * Minimal view surface a command may use to move real DOM focus across blocks.
+ * The Vue `WritekitContext` is structurally compatible; pure logic/tests can pass
+ * a stub. Keeps the command layer free of any Vue/DOM dependency.
+ */
+export interface CommandView {
+  focusBlock: (blockId: string, offset: number | 'start' | 'end') => void;
+}
+
+/**
+ * A command in the ProseMirror style: returns `true` when applicable (and
+ * dispatches when `dispatch` is provided), `false` otherwise so the keymap can
+ * fall through to native behavior. Called without `dispatch` it is a dry run for
+ * computing UI enabled/active state.
+ */
+export type Command = (state: WritekitState, dispatch?: Dispatch, view?: CommandView) => boolean;
+
+/** A parameterized command constructor. */
+export type CommandFactory<Args extends readonly unknown[] = readonly unknown[]> = (...args: Args) => Command;