Misc Bugfixes (#1378)

* Fixed an issue where sometimes when loading the next page, the pagination area wouldn't be properly setup due to a missed rendering cycle

* Refactored BookController to thin it out and refactor some of the functions to apply IOC. Added some split query statements on a few queries.

* Added Split Query to many queries

* Added a visual indicator for loading state of PDF. Will spruce up css later.

* Added back in logic

* Fixed flash of white when refreshing browser

* Hooked in a loading progress bar for the pdf reader

* Close the pdf reader when pressing ESC

API/Services/Tasks/StatsService.cs

@@ -165,6 +165,8 @@ public class StatsService : IStatsService
                 LibraryId = s.LibraryId,
                 Count = _context.Library.Where(l => l.Id == s.LibraryId).SelectMany(l => l.Series).Count()
             })
+            .AsNoTracking()
+            .AsSplitQuery()
             .MaxAsync(d => d.Count);
     }
 
@@ -176,12 +178,16 @@ public class StatsService : IStatsService
                 v.SeriesId,
                 Count = _context.Series.Where(s => s.Id == v.SeriesId).SelectMany(s => s.Volumes).Count()
             })
+            .AsNoTracking()
+            .AsSplitQuery()
             .MaxAsync(d => d.Count);
     }
 
     private Task<int> MaxChaptersInASeries()
     {
         return _context.Series
+            .AsNoTracking()
+            .AsSplitQuery()
             .MaxAsync(s => s.Volumes
                 .Where(v => v.Number == 0)
                 .SelectMany(v => v.Chapters)