More Bugfixes (EPUB Mainly) (#2004)

* Fixed an issue with downloading where spaces turned into plus signs.

* If the refresh token is invalid, but the auth token still has life in it, don't invalidate.

* Fixed docker users unable to save settings

* Show a default error icon until favicon loads

* Fixed a bug in mappings (keys/files) to pages that caused some links not to map appropriately. Updated epub-reader to v3.3.2.

* Expanded Table of Content generation by also checking for any files that are named Navigation.xhtml to have Kavita generate a simple ToC from (instead of just TOC.xhtml)

* Added another hack to massage key to page lookups when rewriting anchors.

* Cleaned up debugging notes

API/Services/Tasks/Scanner/Parser/Parser.cs

@@ -1058,4 +1058,19 @@ public static class Parser
     {
         return string.IsNullOrEmpty(name) ? string.Empty : name.Replace('_', ' ');
     }
+
+    public static string? ExtractFilename(string fileUrl)
+    {
+        var matches = Parser.CssImageUrlRegex.Matches(fileUrl);
+        foreach (Match match in matches)
+        {
+            if (!match.Success) continue;
+
+            // NOTE: This is failing for //localhost:5000/api/book/29919/book-resources?file=OPS/images/tick1.jpg
+            var importFile = match.Groups["Filename"].Value;
+            if (!importFile.Contains("?")) return importFile;
+        }
+
+        return null;
+    }
 }