fix: node replacement fails after execution and modal sync (#9269)

## Summary

Fixes two bugs in the node replacement flow: placeholder detection
failing after workflow execution or pack reinstallation, and missing UI
sync in the Errors Tab when replacements are applied from the modal
dialog.

## Changes

- **Placeholder detection**: Node placeholder detection now matches
against `targetTypes` (derived from the replaceable node list built at
workflow load time) instead of relying on `has_errors` flag or
`registered_node_types` lookup. This ensures replacement works reliably
after execution (where `has_errors` gets cleared) and after pack
reinstallation (where the type becomes registered).
- **Modal → Errors Tab sync**: Added
`executionErrorStore.removeMissingNodesByType()` call in
`MissingNodesContent.vue` after replacement, so the Errors Tab reflects
changes immediately without requiring a page reload.

## Review Focus

- `collectAllNodes` predicate change in `useNodeReplacement.ts`: now
uses `targetTypes.has(originalType)` to find nodes by their original
serialized type. This is independent of runtime state like `has_errors`
or `registered_node_types`.
- `executionErrorStore.removeMissingNodesByType` call timing in
`MissingNodesContent.vue` — runs synchronously after
`replaceNodesInPlace` resolves, before auto-close logic.

┆Issue is synchronized with this [Notion
page](https://www.notion.so/PR-9269-fix-node-replacement-fails-after-execution-and-modal-sync-3146d73d365081218398c961639b450f)
by [Unito](https://www.unito.io)

src/platform/nodeReplacement/useNodeReplacement.ts

@@ -226,11 +226,22 @@ export function useNodeReplacement() {
       useWorkflowStore().activeWorkflow?.changeTracker ?? null
     changeTracker?.beforeChange()
 
+    // Target types come from node_replacements fetched at workflow load time
+    // and the missing nodes detected at that point — not from the current
+    // registered_node_types. This ensures replacement still works even if
+    // the user has since installed the missing node pack.
+    const targetTypes = new Set(
+      selectedTypes.map((t) => (typeof t === 'string' ? t : t.type))
+    )
+
     try {
-      const placeholders = collectAllNodes(
-        graph,
-        (n) => !!n.has_errors && !!n.last_serialization
-      )
+      const placeholders = collectAllNodes(graph, (n) => {
+        if (!n.last_serialization) return false
+        // Prefer the original serialized type; fall back to the live type
+        // for nodes whose serialization predates the type field.
+        const originalType = n.last_serialization.type ?? n.type
+        return !!originalType && targetTypes.has(originalType)
+      })
 
       for (const node of placeholders) {
         const match = findMatchingType(node, selectedTypes)