Give the importer test a fresh profile every run

The test home under target/ outlives a run, so the identity the first
run imported made every later run fail. The test now points AppDirs at
a temporary directory of its own, which also works when another test
resolved the profile first.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

ts3-client/core/src/test/java/com/ts3client/teamspeak/TeamSpeakImporterTest.java

@@ -1,15 +1,17 @@
 package com.ts3client.teamspeak;
 
+import com.ts3client.config.AppDirs;
 import com.ts3client.config.Bookmark;
 import com.ts3client.config.Bookmarks;
 import com.ts3client.config.IdentityEntry;
 import com.ts3client.config.IdentityStore;
 import com.ts3client.config.Settings;
-import org.junit.jupiter.api.BeforeAll;
+import org.junit.jupiter.api.AfterEach;
+import org.junit.jupiter.api.BeforeEach;
 import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.io.TempDir;
 
-import java.io.File;
-import java.nio.file.Files;
+import java.nio.file.Path;
 import java.util.List;
 
 import static org.junit.jupiter.api.Assertions.assertEquals;
@@ -18,10 +20,15 @@ import static org.junit.jupiter.api.Assertions.assertTrue;
 
 class TeamSpeakImporterTest {
 
-    /** The stores resolve {@code ~/.ts3jclient} once, so point them at scratch space before they load. */
-    @BeforeAll
-    static void isolateHome() throws Exception {
-        System.setProperty("user.home", Files.createTempDirectory("ts3j-import").toString());
+    /** Each test starts from an empty profile; the shared test home keeps identities from earlier runs. */
+    @BeforeEach
+    void freshProfile(@TempDir Path dir) {
+        AppDirs.init(dir.resolve("profile").toFile(), dir.resolve("chats"));
+    }
+
+    @AfterEach
+    void defaultProfile() {
+        AppDirs.init(null, null);
     }
 
     @Test