Merge pull request 'Fix: Passwort-Aenderung Whitelabel-Error' (#2) from fix/change-password into main

src/main/java/com/example/mindflux/controller/ProfileController.java

@@ -10,6 +10,7 @@ import org.springframework.stereotype.Controller;
 import org.springframework.ui.Model;
 import org.springframework.web.bind.annotation.*;
 import org.springframework.web.multipart.MultipartFile;
+import org.springframework.web.servlet.mvc.support.RedirectAttributes;
 
 import jakarta.servlet.http.HttpServletRequest;
 import jakarta.servlet.http.HttpServletResponse;
@@ -133,25 +134,25 @@ public class ProfileController {
     public String changePassword(@RequestParam("oldPassword") String oldPassword,
                                   @RequestParam("newPassword") String newPassword,
                                   Principal principal,
-                                  Model model) {
+                                  RedirectAttributes redirectAttributes) {
         String username = principal.getName();
         User user = userService.findByUsername(username);
 
         if (user == null) {
-            model.addAttribute("error", "Benutzer nicht gefunden.");
+            redirectAttributes.addFlashAttribute("error", "Benutzer nicht gefunden.");
-            return "profile";
+            return "redirect:/profile/settings";
         }
 
         if (!passwordEncoder.matches(oldPassword, user.getPassword())) {
-            model.addAttribute("error", "Das aktuelle Passwort ist falsch.");
+            redirectAttributes.addFlashAttribute("error", "Das aktuelle Passwort ist falsch.");
-            return "profile";
+            return "redirect:/profile/settings";
         }
 
         user.setPassword(passwordEncoder.encode(newPassword));
         userService.save(user);
 
-        model.addAttribute("message", "Passwort erfolgreich geändert.");
+        redirectAttributes.addFlashAttribute("message", "Passwort erfolgreich geändert.");
-        return "profile";
+        return "redirect:/profile/settings";
     }
 
     @PostMapping("/profile/delete")

src/main/resources/templates/settings.html

@@ -29,6 +29,14 @@
   <h1 style="color:var(--heading); font-size:1.9rem; font-weight:800; margin:.3rem 0 .25rem;">⚙️ Einstellungen</h1>
   <p style="color:var(--muted); margin-bottom:1.4rem;">Passe Mindflux nach deinen Wünschen an</p>
 
+  <!-- Flash-Meldungen (z. B. nach Passwortänderung) -->
+  <div th:if="${message}" class="mf-panel accent mf-success" style="margin-bottom:1.2rem;">
+    <p th:text="${message}" style="color:var(--accent); margin:0;"></p>
+  </div>
+  <div th:if="${error}" class="mf-panel mf-error" style="margin-bottom:1.2rem;">
+    <p th:text="${error}" style="color:#c0392b; margin:0;"></p>
+  </div>
+
   <!-- Theme-Einstellung (Dummy) -->
   <section class="mf-panel" style="margin-bottom:1.2rem;">
     <h2 class="mf-section-title">Theme wechseln</h2>