fix(ui): per-field sub-schema for escape-hatch Monaco editors + dispose guard (#261)

src/ZB.MOM.WW.ScadaBridge.CentralUI/wwwroot/js/monaco-init.js

@@ -330,12 +330,16 @@
         // A json editor with a schema needs an explicitly-URI'd model so the
         // schema's fileMatch can target exactly this editor.
         let model = null;
+        let hasSchema = false;
         if (isJson) {
             const uri = modelUriFor(id);
             model = monaco.editor.getModel(uri);
             if (model) { model.setValue(options.value || ""); }
             else { model = monaco.editor.createModel(options.value || "", "json", uri); }
-            if (options.jsonSchema) { applyJsonSchema(id, options.jsonSchema); }
+            if (options.jsonSchema && options.jsonSchema.trim().length > 0) {
+                applyJsonSchema(id, options.jsonSchema);
+                hasSchema = true;
+            }
         }
 
         const editor = monaco.editor.create(host, {
@@ -372,7 +376,7 @@
             dotNetRef.invokeMethodAsync("OnValueChanged", value).catch(function () {});
             if (options.language === "csharp") scheduleDiagnostics();
         });
-        editors[id] = { editor: editor, dotNetRef: dotNetRef, isJson: isJson };
+        editors[id] = { editor: editor, dotNetRef: dotNetRef, isJson: isJson, hasSchema: hasSchema };
 
         // Run an initial diagnostic pass so existing scripts show their markers.
         if (language === "csharp") scheduleDiagnostics();
@@ -381,6 +385,9 @@
     function setJsonSchema(id, schemaJson) {
         const entry = editors[id];
         if (!entry || !entry.isJson) return;
+        // Track whether this editor currently owns a schema entry in jsonDefaults
+        // so dispose can skip the teardown interop when there is nothing to drop.
+        entry.hasSchema = !!(schemaJson && schemaJson.trim().length > 0);
         applyJsonSchema(id, schemaJson);
     }
 
@@ -436,7 +443,9 @@
         if (!entry) return;
         // Drop this editor's json schema entry and its explicitly-URI'd model so
         // a disposed json editor leaves nothing behind in the global defaults.
-        if (entry.isJson) {
+        // Skip the schema teardown for a json editor that never had a schema —
+        // there is no entry to remove, so the applyJsonSchema interop is spurious.
+        if (entry.isJson && entry.hasSchema) {
             try { applyJsonSchema(id, null); } catch (e) {}
         }
         try { entry.editor.dispose(); } catch (e) {}