Fix PDF export filename: Add .pdf extension to downloaded files (#13)

* Initial plan

* Fix PDF export filename: use JavaScript download with proper .pdf extension

Co-authored-by: clayschaad <11883505+clayschaad@users.noreply.github.com>

* Remove test PDF file from repository

Co-authored-by: clayschaad <11883505+clayschaad@users.noreply.github.com>

* Add year and month

---------

Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: clayschaad <11883505+clayschaad@users.noreply.github.com>
Co-authored-by: Claudio Schaad <c.schaad@pog.ch>

Client/Pages/Index.razor.cs

@@ -104,8 +104,7 @@ namespace ShiftScheduler.Client.Pages
             var response = await HttpClient.PostAsJsonAsync("api/shift/export_pdf", shiftsWithTransportList);
             var bytes = await response.Content.ReadAsByteArrayAsync();
             var base64 = Convert.ToBase64String(bytes);
-            var fileUrl = $"data:application/octet-stream;base64,{base64}";
+            await JSRuntime.InvokeVoidAsync("downloadFile", $"Schedule {EditYear}-{EditMonth:00}.pdf", "application/pdf", base64);
-            NavigationManager.NavigateTo(fileUrl, true);
         }
 
         private async Task SaveScheduleToStorage()

Client/wwwroot/index.html

@@ -26,6 +26,7 @@
         <a href="" class="reload">Reload</a>
         <a class="dismiss">🗙</a>
     </div>
+    <script src="js/fileDownload.js"></script>
     <script src="_framework/blazor.webassembly.js"></script>
 </body>
 

Client/wwwroot/js/fileDownload.js

@@ -0,0 +1,18 @@
+window.downloadFile = (filename, contentType, base64Data) => {
+    const byteCharacters = atob(base64Data);
+    const byteNumbers = new Array(byteCharacters.length);
+    for (let i = 0; i < byteCharacters.length; i++) {
+        byteNumbers[i] = byteCharacters.charCodeAt(i);
+    }
+    const byteArray = new Uint8Array(byteNumbers);
+    const blob = new Blob([byteArray], { type: contentType });
+    
+    const url = window.URL.createObjectURL(blob);
+    const a = document.createElement('a');
+    a.href = url;
+    a.download = filename;
+    document.body.appendChild(a);
+    a.click();
+    document.body.removeChild(a);
+    window.URL.revokeObjectURL(url);
+};