Fix for adding node in collapsed functions (#9060)

Fixes #9049

There were still some stubs left in node creation code.

# Important Notes
I haven't added any tests, as unit testing the graph store is very difficult - it has much tangled logic there. I'm going to try to untangle it a bit, but in a separate PR.

app/gui2/src/components/GraphEditor.vue

@@ -90,12 +90,12 @@ projectStore.lsRpcConnection.then(
     })
   },
   (err) => {
-    toast.error(`Connection to language server failed: ${err}`)
+    toast.error(`Connection to language server failed: ${JSON.stringify(err)}`)
   },
 )
 
 projectStore.executionContext.on('executionFailed', (err) => {
-  toast.error(`Execution Failed: ${err}`, {})
+  toast.error(`Execution Failed: ${JSON.stringify(err)}`, {})
 })
 
 onMounted(() => {

app/gui2/src/stores/graph/index.ts

@@ -210,15 +210,12 @@ export const useGraphStore = defineStore('graph', () => {
     metadata: NodeMetadataFields = {},
     withImports: RequiredImport[] | undefined = undefined,
   ): Opt<NodeId> {
-    const mod = proj.module
-    if (!mod) return
-    const ident = generateUniqueIdent()
-    const currentFunc = 'main'
-    const method = Ast.findModuleMethod(topLevel.value!, currentFunc)
+    const method = syncModule.value ? methodAstInModule(syncModule.value) : undefined
     if (!method) {
       console.error(`BUG: Cannot add node: No current function.`)
       return
     }
+    const ident = generateUniqueIdent()
     metadata.position = { x: position.x, y: position.y }
     return edit((edit) => {
       if (withImports) addMissingImports(edit, withImports)