[feat] Add core Vue widget infrastructure

- SimplifiedWidget interface for Vue-based node widgets
- widgetPropFilter utility with component-specific exclusion lists
- Removes DOM manipulation and positioning concerns
- Provides clean API for value binding and prop filtering

src/types/simplifiedWidget.ts

@@ -0,0 +1,27 @@
+/**
+ * Simplified widget interface for Vue-based node rendering
+ * Removes all DOM manipulation and positioning concerns
+ */
+
+export interface SimplifiedWidget<T = any, O = Record<string, any>> {
+  /** Display name of the widget */
+  name: string
+
+  /** Widget type identifier (e.g., 'STRING', 'INT', 'COMBO') */
+  type: string
+
+  /** Current value of the widget */
+  value: T
+
+  /** Widget options including filtered PrimeVue props */
+  options?: O
+
+  /** Callback fired when value changes */
+  callback?: (value: T) => void
+
+  /** Optional serialization method for custom value handling */
+  serializeValue?: () => any
+
+  /** Optional method to compute widget size requirements */
+  computeSize?: () => { minHeight: number; maxHeight?: number }
+}