fix(subgraphEditor): exclude promoted widgets from candidate list

The candidate filter compared `toKey()` outputs across the active
section (PromotedWidgetView, key includes `:sourceNodeId` suffix) and
the interior section (raw widget, no suffix). The shapes never matched,
so every link-promoted widget kept showing in the Hidden section as
`icon-eye/eye-off`. Compare on the interior `(node.id, widget.name)`
identity instead.

Update the Properties panel test to demote a link-promoted widget via
the source-node context menu (since linked promotions render
`icon-link` and disable the editor toggle by design).

Amp-Thread-ID: https://ampcode.com/threads/T-019e2260-c2ba-70b4-9962-1638be4bf645
Co-authored-by: Amp <amp@ampcode.com>

browser_tests/tests/subgraph/subgraphPromotion.spec.ts

@@ -667,11 +667,12 @@ test('Properties panel operations @vue-nodes', async ({ comfyPage }) => {
     )
   })
 
-  await editor.togglePromotion(subgraphNode, {
-    nodeName: 'KSampler',
-    widgetName: 'steps',
-    toState: false
-  })
+  // Link-promoted widgets render `icon-link` (disabled toggle) in the editor;
+  // demotion happens via the source-node context menu inside the subgraph.
+  await comfyPage.vueNodes.enterSubgraph('2')
+  const ksampler = await comfyPage.vueNodes.getFixtureByTitle('KSampler')
+  await comfyPage.subgraph.unpromoteWidget(ksampler.root, 'steps')
+  await comfyPage.subgraph.exitViaBreadcrumb()
   await expect(steps, 'Un-promote widget').toBeHidden()
 })
 

src/components/rightSidePanel/subgraph/SubgraphEditor.vue

@@ -127,9 +127,16 @@ const interiorWidgets = computed<WidgetItem[]>(() => {
 const candidateWidgets = computed<WidgetItem[]>(() => {
   const node = activeNode.value
   if (!node) return []
+  // An interior widget is "already promoted" iff some active row's source
+  // identity matches it. PromotedWidgetView carries `sourceNodeId`; preview
+  // exposures are stored as the interior `[node, widget]` tuple directly.
+  const promotedSourceKeys = new Set(
+    activeWidgets.value.map(
+      ([n, w]) => `${getSourceNodeId(w) ?? String(n.id)}:${getWidgetName(w)}`
+    )
+  )
   return interiorWidgets.value.filter(
-    (item: WidgetItem) =>
-      !activeWidgets.value.some((active) => toKey(active) === toKey(item))
+    ([n, w]) => !promotedSourceKeys.has(`${n.id}:${w.name}`)
   )
 })
 const filteredCandidates = computed<WidgetItem[]>(() => {