feat(Board): add always-editable RoleField specimen input

vitest.setup.jsdom.ts

@@ -19,6 +19,19 @@ Element.prototype.animate = vi.fn().mockReturnValue({
 // jsdom lacks SVG geometry methods
 (SVGElement.prototype as any).getTotalLength = vi.fn(() => 0);
 
+// jsdom lacks innerText; back it with textContent so contenteditable specs work.
+if (!Object.getOwnPropertyDescriptor(HTMLElement.prototype, 'innerText')) {
+    Object.defineProperty(HTMLElement.prototype, 'innerText', {
+        configurable: true,
+        get(this: HTMLElement) {
+            return this.textContent ?? '';
+        },
+        set(this: HTMLElement, value: string) {
+            this.textContent = value;
+        },
+    });
+}
+
 // Robust localStorage mock for jsdom environment
 const localStorageMock = (() => {
     let store: Record<string, string> = {};