feat(ingestion): implement hybrid metadata verification form #34 (#41)

### Description
This PR implements **Issue #34: [UI/UX] Implement Hybrid Metadata Verification Form in Ingestion Modal**.

### Key Changes
- **Metadata Verification State**: Introduced a new state in `BookIngestionModal.razor` allowing users to edit `Title` and `Author` before final ingestion.
- **Cover Image Preview**: Added a high-fidelity cover preview with a CSS-based glowing placeholder fallback for books without embedded covers.
- **Ingestion Pipeline**:
  - Implemented `IngestEbookCommand` and `IngestEbookCommandHandler`.
  - Added `IBookStorageService` and its implementation for managing EPUB and cover file storage.
  - Exposed `POST /api/library/ingest` Minimal API endpoint with `.DisableAntiforgery()` to handle client-side JSON uploads.
- **Stability Fixes**:
  - Resolved DI validation errors in the WASM client by providing a dummy `IBookStorageService` registration.
  - Adjusted Kestrel request limits to handle large EPUB payloads (up to 100MB).
  - Corrected middleware ordering to ensure Antiforgery works correctly with Authentication.

### Verification
- Solution builds successfully.
- Manual verification of modal state transitions and API ingestion logic.

Closes #34.

---------

Co-authored-by: Marek Jasiński <jasins.marek@gmail.com>
Reviewed-on: #41
Reviewed-by: Marek Jaisński <jasins.marek@gmail.com>
Co-authored-by: Antigravity <antigravity@google.com>
Co-committed-by: Antigravity <antigravity@google.com>

src/NexusReader.UI.Shared/Services/ReaderNavigationService.cs

@@ -1,9 +1,17 @@
 using System.Linq;
+using Microsoft.AspNetCore.Components;
 
 namespace NexusReader.UI.Shared.Services;
 
 public class ReaderNavigationService : IReaderNavigationService
 {
+    private readonly NavigationManager _navigationManager;
+
+    public ReaderNavigationService(NavigationManager navigationManager)
+    {
+        _navigationManager = navigationManager;
+    }
+
     public int CurrentChapterIndex { get; private set; } = 0;
     public int TotalChapters { get; private set; } = 1;
     public string ChapterTitle { get; private set; } = "Loading...";
@@ -47,6 +55,11 @@ public class ReaderNavigationService : IReaderNavigationService
         }
     }
 
+    public void NavigateToBook(Guid bookId)
+    {
+        _navigationManager.NavigateTo($"/reader/{bookId}");
+    }
+
     private async Task NotifyNavigationChangedAsync()
     {
         var handlers = OnNavigationChanged?.GetInvocationList();