fix: prevent promoted textarea from being disabled on SubgraphNode

PromotedWidgetSlot now overrides computedDisabled to always return false, since the slot should remain interactive even though its associated input is internally linked.

PromotedDomWidgetAdapter proxy also intercepts computedDisabled to prevent the DOM widget from inheriting the interior widget's disabled state.

Amp-Thread-ID: https://ampcode.com/threads/T-019c5575-c485-767b-a7d1-adccefa4f60e
Co-authored-by: Amp <amp@ampcode.com>

src/core/graph/subgraph/PromotedDomWidgetAdapter.ts

@@ -45,6 +45,7 @@ export function createPromotedDomWidgetAdapter<V extends object | string>(
           return hostNode
         case 'promoted':
         case 'serialize':
+        case 'computedDisabled':
           return false
         case 'innerWidget':
           return target

src/core/graph/subgraph/PromotedWidgetSlot.test.ts

@@ -551,22 +551,11 @@ describe('PromotedWidgetSlot', () => {
       expect(slot._displayValue).toBe('Disconnected')
     })
 
-    it('returns empty string when computedDisabled', () => {
-      const store = useWidgetValueStore()
-      store.registerWidget({
-        nodeId: '5',
-        name: 'seed',
-        type: 'number',
-        value: 42,
-        options: {},
-        disabled: false,
-        promoted: true
-      })
-
+    it('is never computedDisabled (promoted slots stay interactive)', () => {
       const subNode = createMockSubgraphNode()
       const slot = new PromotedWidgetSlot(subNode, '5', 'seed')
       slot.computedDisabled = true
-      expect(slot._displayValue).toBe('')
+      expect(slot.computedDisabled).toBe(false)
     })
   })
 })

src/core/graph/subgraph/PromotedWidgetSlot.ts

@@ -78,6 +78,16 @@ export class PromotedWidgetSlot extends BaseWidget<IBaseWidget> {
       enumerable: true
     })
 
+    // The SubgraphNode's input slots are internally linked, which causes
+    // `updateComputedDisabled()` to set `computedDisabled = true` on all
+    // matching widgets.  The promoted slot should always remain interactive.
+    Object.defineProperty(this, 'computedDisabled', {
+      get: () => false,
+      set: () => {},
+      configurable: true,
+      enumerable: true
+    })
+
     this.callback = (value, canvas, _node, pos, e) => {
       const resolved = this.resolve()
       if (!resolved) return