refactor: standardize variable naming and file formatting

- Rename Quantity to quantity in BomItem for consistent naming convention
- Update references in MainModule to use lowercase quantity
- Add newlines at end of files for consistency
- Update vba_metadata.json with new source path and document module

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

VBA/ClassModules/ConditionEvaluator.cls

@@ -207,4 +207,4 @@ Private Function IsMatchedParentheses(str As String) As Boolean
     Next i
 
     IsMatchedParentheses = (depth = 0)
-End Function
+End Function