fix(renamer): fix WPF relative resource renaming (upstream mkaring#565)

Cherry-pick of mkaring#565. Fixes relative resource path
handling in WPF ResourceDictionary entries by passing relative file
names (not full paths) to bamlRef.Rename(), ensuring BAML references
using relative URIs are correctly updated during renaming.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: RandomCrocodile

Confuser.Renamer/Analyzers/WPFAnalyzer.cs

@@ -60,8 +60,14 @@ public void PreRename(ConfuserContext context, INameService service, ProtectionP
 					var decodedName = HttpUtility.UrlDecode(doc.DocumentName);
 					var encodedName = doc.DocumentName;
 					if (bamlRefs.TryGetValue(decodedName, out var references)) {
-						var decodedDirectory = decodedName.Substring(0, decodedName.LastIndexOf('/') + 1);
-						var encodedDirectory = encodedName.Substring(0, encodedName.LastIndexOf('/') + 1);
+						var decodedLastSlash = decodedName.LastIndexOf('/') + 1;
+						var encodedLastSlash = encodedName.LastIndexOf('/') + 1;
+
+						var decodedDirectory = decodedName.Substring(0, decodedLastSlash);
+						var encodedDirectory = encodedName.Substring(0, encodedLastSlash);
+
+						var decodedFileName = decodedName.Substring(decodedLastSlash);
+						var encodedFileName = encodedName.Substring(encodedLastSlash);
 
 						var fileName = service.RandomName(renameMode).ToLowerInvariant();
 						if (decodedName.EndsWith(".BAML", StringComparison.OrdinalIgnoreCase))
@@ -78,8 +84,8 @@ public void PreRename(ConfuserContext context, INameService service, ProtectionP
 
 						if (renameOk) {
 							foreach (var bamlRef in references) {
-								bamlRef.Rename(module, decodedName, decodedNewName);
-								bamlRef.Rename(module, encodedName, encodedNewName);
+								bamlRef.Rename(module, decodedFileName, fileName);
+								bamlRef.Rename(module, encodedFileName, fileName);
 							}
 							doc.DocumentName = encodedNewName;
 						}
@@ -349,4 +355,4 @@ void AnalyzeResources(ConfuserContext context, INameService service, ModuleDefMD
 				context.Annotations.Set(module, BAMLKey, wpfResInfo);
 		}
 	}
-}
+}