fix(data-mapper-v2): resolve XML attribute paths when loading saved maps (#8770)

When deserializing data maps containing XML attribute bindings within loops,
the relative attribute path format './@AttributeName' was not being properly
resolved back to the full schema node key. This caused "Source schema node
not found" errors when reloading saved maps.

The fix normalizes './@' prefixed paths by stripping the './' before
constructing the full schema path lookup.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-authored-by: Claude Opus 4.5 <noreply@anthropic.com>

Author: takyyon

libs/data-mapper-v2/src/mapHandling/MapDefinitionDeserializer.ts

@@ -148,8 +148,9 @@ export class MapDefinitionDeserializer {
       srcNode = this.getSourceNodeWithBackout(key);
     } else {
       const lastLoop = this.getLowestLoop().key;
-      // danielle handle namespace here
-      srcNode = findNodeForKey(`${lastLoop}/${key}`, this._sourceSchema.schemaTreeRoot, false) as SchemaNodeExtended;
+      // Handle relative attribute paths like './@AttributeName' by stripping the './' prefix
+      const normalizedKey = key.startsWith('./@') ? key.substring(2) : key;
+      srcNode = findNodeForKey(`${lastLoop}/${normalizedKey}`, this._sourceSchema.schemaTreeRoot, false) as SchemaNodeExtended;
     }
     return srcNode;
   };

libs/data-mapper-v2/src/mapHandling/__test__/MapDefinitionDeserializer.spec.ts

@@ -1224,7 +1224,7 @@ describe('mapDefinitions/MapDefinitionDeserializer', () => {
         );
       });
 
-      it.skip('creates a looping connection w/ index variable, conditional, and relative attribute path', () => {
+      it('creates a looping connection w/ index variable, conditional, and relative attribute path', () => {
         simpleMap['ns0:Root'] = {
           LoopingWithIndex: {
             WeatherSummary: {