Improve GIF playback (#927)

DiscordChatExporter.Core/Exporting/Writers/Html/MessageGroupTemplate.cshtml

@@ -214,7 +214,7 @@
                         @if (embed.Video is not null && !string.IsNullOrWhiteSpace(embed.Video.Url) && embed.Thumbnail is not null)
                         {
                             <div class="chatlog__attachment">
-                                <video class="chatlog__attachment-media" poster="@await ResolveUrlAsync(embed.Thumbnail.ProxyUrl ?? embed.Thumbnail.Url)" loop="" controls="" aria-label="GIF" width="@(embed.Video.Width)" height="@(embed.Video.Height)">
+                                <video class="chatlog__attachment-media" poster="@await ResolveUrlAsync(embed.Thumbnail.ProxyUrl ?? embed.Thumbnail.Url)" loop onmouseover="this.play()" onmouseout="this.pause()" width="@embed.Video.Width" height="@embed.Video.Height">
                                     <source src="@await ResolveUrlAsync(embed.Video.ProxyUrl ?? embed.Video.Url)" alt="@(embed.Description ?? "Tenor GIF")" title="@embed.Title">
                                 </video>                            
                             </div>