QR-Scanner: Kamera-Fallbacks und Foto-Upload; weitere Aenderungen

Lagerbestand/Components/Shared/QrScannerModal.razor

@@ -32,6 +32,11 @@
                     <div class="qr-status">QR-Code des Reports vor die Kamera halten</div>
                 }
 
+                <div class="qr-manual">
+                    <label for="@_fileInputId" class="btn btn-secondary w-100">📷 Foto aufnehmen / Bild wählen</label>
+                    <input id="@_fileInputId" type="file" accept="image/*" capture="environment" style="display:none" @onchange="OnFileSelected" />
+                </div>
+
                 <div class="qr-manual">
                     <label for="qr-manual-input">Oder Link / Nummer einfügen</label>
                     <div class="qr-manual-row">
@@ -53,6 +58,7 @@
     [Parameter] public EventCallback<string> OnScanned { get; set; }
 
     private readonly string _elementId = $"qr-reader-{Guid.NewGuid():N}";
+    private readonly string _fileInputId = $"qr-file-{Guid.NewGuid():N}";
     private DotNetObjectReference<QrScannerModal>? _selfRef;
     private bool _scannerActive;
     private bool _wasOpen;
@@ -127,6 +133,26 @@
         await OnScanned.InvokeAsync(text.Trim());
     }
 
+    private async Task OnFileSelected(ChangeEventArgs e)
+    {
+        cameraError = null;
+        _scannerActive = false;
+        try
+        {
+            var text = await JS.InvokeAsync<string?>("qrScanner.scanFile", _elementId, _fileInputId);
+            if (!string.IsNullOrWhiteSpace(text))
+            {
+                await OnQrScanned(text);
+                return;
+            }
+        }
+        catch (JSException ex)
+        {
+            cameraError = ExtractMessage(ex.Message);
+        }
+        StateHasChanged();
+    }
+
     private async Task SubmitManual()
     {
         if (string.IsNullOrWhiteSpace(manualText)) return;