fix(frontend): proper fix for invalid characters

src/Mangarr.Frontend/Pages/Manga/Link/AddModal.razor

@@ -1,4 +1,5 @@
-<div class="modal fade" id="[email protected]("=", string.Empty).Replace("/", string.Empty)" tabindex="-1">
+@using System.Web
+<div class="modal fade" id="[email protected](MangaId)" tabindex="-1">
     <div class="modal-dialog modal-dialog-centered">
         <div class="modal-content">
             <div class="modal-header">

src/Mangarr.Frontend/Pages/Manga/Link/ContentSourceItem.razor

@@ -1,9 +1,8 @@
-<div class="d-flex flex-column card p-2 me-2 content-source-item">
+@using System.Web
+<div class="d-flex flex-column card p-2 me-2 content-source-item">
     <img class="content-source-item-cover" src="@CoverImage" alt="cover" referrerpolicy="no-referrer">
     <p class="text-truncate">@Title</p>
-    <button class="btn btn-primary" type="button" data-bs-toggle="modal" data-bs-target="#add-manga-modal-@MangaId.Replace("=", string.Empty).Replace("/", string.Empty)">Select</button>
+    <button class="btn btn-primary" type="button" data-bs-toggle="modal" data-bs-target="#add-manga-modal-@HttpUtility.UrlEncode(MangaId)">Select</button>
 </div>
 
 <AddModal Id="@Id" Identifier="@Identifier" MangaId="@MangaId"/>
-
-@* href="/manga/@Id/add/@Identifier/@MangaId"  *@