Jump Bar Testing (#1302)

* Implemented a basic jump bar for the library view. This currently just interacts with existing pagination controls and is not inlined with infinite scroll yet. This is a first pass implementation.

* Refactored time estimates into the reading service.

* Cleaned up when the jump bar is shown to mimic pagination controls

* Cleanup up code in reader service.

* Scroll to card when selecting a jump key that is shown on the current page.

* Ensure estimated times always has the smaller number on left hand side.

* Fixed a bug with a missing vertical rule

* Fixed an off by 1 pixel for search overlay

API/DTOs/JumpBar/JumpKeyDto.cs

@@ -0,0 +1,20 @@
+namespace API.DTOs.JumpBar;
+
+/// <summary>
+/// Represents an individual button in a Jump Bar
+/// </summary>
+public class JumpKeyDto
+{
+    /// <summary>
+    /// Number of items in this Key
+    /// </summary>
+    public int Size { get; set; }
+    /// <summary>
+    /// Code to use in URL (url encoded)
+    /// </summary>
+    public string Key { get; set; }
+    /// <summary>
+    /// What is visible to user
+    /// </summary>
+    public string Title { get; set; }
+}