fix: Prevent self-copy of analytics_win.dll in Play Mode

This commit refines the logic in `AnalyticsPlayModeSetup.cs` to correctly handle the scenario where `analytics_win.dll` (the source) is already located in the project root (the destination for Play Mode).

Previously, if the DLL was in the project root, the `File.Copy` operation would attempt to copy the file onto itself, resulting in an `IOException`.

Changes in `editor/app/src/AnalyticsPlayModeSetup.cs`:
- Before attempting to copy the DLL for Play Mode:
    - The full canonical paths of the source and destination are now compared.
    - If the source and destination paths are identical (i.e., the DLL is already in the project root), the copy operation is skipped, and an informational message is logged.
- The file copy (with its try-catch block) only proceeds if the source and destination paths are different.

This prevents an unnecessary `IOException` and ensures the setup is cleaner when the DLL is already correctly placed for Play Mode.

Author: google-labs-jules[bot]

editor/app/src/AnalyticsPlayModeSetup.cs

@@ -19,6 +19,15 @@ private static void OnPlayModeStateChanged(PlayModeStateChange state) {
                 Type firebaseAnalyticsType = Type.GetType(FirebaseAnalyticsEditorConstants.AnalyticsTypeFullName);
                 if (firebaseAnalyticsType != null) {
                     if (File.Exists(FirebaseAnalyticsEditorConstants.DllSourcePath)) {
+                        string fullSourcePath = Path.GetFullPath(FirebaseAnalyticsEditorConstants.DllSourcePath);
+                        // string destinationDirectory = "./"; // This is DestinationDir
+                        string fullDestinationPath = Path.GetFullPath(Path.Combine(DestinationDir, FirebaseAnalyticsEditorConstants.DllName));
+
+                        if (fullSourcePath.Equals(fullDestinationPath, StringComparison.OrdinalIgnoreCase)) {
+                            Debug.Log("Firebase Analytics: " + FirebaseAnalyticsEditorConstants.DllName + " is already in the project root. No copy needed for Play Mode.");
+                            return;
+                        }
+
                         try {
                             Directory.CreateDirectory(DestinationDir); // Should be benign for "./"
                             string destinationDllPath = Path.Combine(DestinationDir, FirebaseAnalyticsEditorConstants.DllName);