Refactor dialog components to use form-container for improved layout and styling; update button styles for consistency

src/Duempelkas.App/Components/Dialogs/AddTransferDialog.razor

@@ -5,7 +5,7 @@
     <div class="dialog-content" @onclick:stopPropagation="true">
         <h5 class="mb-3">@(EditEntry != null ? "Umbuchung bearbeiten" : "Neue Umbuchung")</h5>
 
-        <div class="mb-3">
+        <div class="form-container">
             <label class="form-label">Zielkonto</label>
             <select class="form-select" @bind="targetAccountId">
                 <option value="0">— Auswählen —</option>
@@ -14,25 +14,21 @@
                     <option value="@acc.Id">@acc.Name</option>
                 }
             </select>
-        </div>
 
-        <div class="mb-3">
             <label class="form-label">Datum</label>
             <input type="date" class="form-control" @bind="date" />
-        </div>
-        <div class="mb-3">
+
             <label class="form-label">Bezeichnung</label>
             <input type="text" class="form-control" @bind="title" placeholder="Beschreibung der Umbuchung" />
-        </div>
-        <div class="mb-3">
+
             <label class="form-label">Betrag (€)</label>
             <input type="number" class="form-control" @bind="amount" step="0.01" min="0.01" />
         </div>
 
         <div class="d-flex justify-content-end gap-2">
-            <button class="btn btn-outline-secondary" @onclick="Cancel"><i class="bi bi-x-lg"></i> Abbrechen</button>
-            <button class="btn btn-primary" @onclick="Save"
+            <button class="btn btn-success" @onclick="Save"
                     disabled="@(!CanSave)"><i class="bi bi-arrow-left-right"></i> @(EditEntry != null ? "Speichern" : "Umbuchen")</button>
+            <button class="btn btn-outline-secondary" @onclick="Cancel"><i class="bi bi-x-lg"></i> Abbrechen</button>
         </div>
     </div>
 </div>