feat(ui): constrain decimal input and add stacked timed toasts with uniform actions

src/Duempelkas.App/Pages/Dashboard.razor

@@ -1,3 +1,4 @@
+@inject ToastService Toasts
 @inject ReportingPeriod Period
 @page "/"
 @inject IAccountService AccountService
@@ -10,7 +11,6 @@
 
 <div class="container-fluid">
     <OperationNotice Result="fileResult" />
-    @if (fileBusy) { <p role="status" aria-live="polite">Dateiaktion läuft … Bitte warten.</p> }
 
 
     <div class="d-flex justify-content-between align-items-center">
@@ -24,25 +24,25 @@
         </div>
     </div>
 
-    <div class="d-flex align-items-center gap-2 py-3 flex-wrap">
+    <div class="action-toolbar">
         <button class="btn-nav btn-primary" @onclick="() => showAddAccount = true">
-            <i class="bi bi-plus-lg"></i> Neues Konto
+            <i class="bi bi-plus-lg"></i><span>Neues Konto</span>
         </button>
         <button class="btn-nav btn-success" @onclick="HandleBackupAsync" disabled="@fileBusy">
-            <i class="bi bi-save"></i> Sicherung erstellen
+            <i class="bi bi-save"></i> <span>Sicherung<br /> erstellen</span>
         </button>
 
         <button class="btn-nav btn-dark" @onclick="HandleDashboardExportAsync" disabled="@fileBusy">
-            <i class="bi bi-file-earmark-pdf"></i> Als PDF speichern
+            <i class="bi bi-file-earmark-pdf"></i> <span>Als PDF<br /> speichern</span>
         </button>
         <button class="btn btn-nav btn-primary" @onclick="OpenYearFilterDialog">
-            <i class="bi bi-funnel"></i> @GetFilterLabel()
+            <i class="bi bi-funnel"></i><span>@GetFilterLabel()</span>
         </button>
         <button class="btn btn-nav btn-secondary" @onclick="ToggleThemeAsync" title="Farbmodus wechseln">
-            <i class="@ThemeButtonIconClass"></i> Modus<br>@ThemeButtonLabel
+            <i class="@ThemeButtonIconClass"></i><span>Modus<br />@ThemeButtonLabel</span>
         </button>
         <details class="more-actions">
-            <summary class="btn btn-outline-secondary">Weitere Aktionen</summary>
+            <summary class="btn btn-nav btn-outline-secondary"><i class="bi bi-three-dots"></i><span>Weitere<br /> Aktionen</span></summary>
             <button class="btn btn-warning mt-2" @onclick="HandleRestoreAsync" disabled="@fileBusy">
                 <i class="bi bi-arrow-counterclockwise"></i> Sicherung zurückspielen
             </button>