[frontend] Suppress build warnings where appropriate

Iceshrimp.Frontend/Components/Compose.razor

@@ -103,6 +103,7 @@
                    .Select(vis =>
                                new DropdownElement<NoteVisibility>
                                {
+                                   #pragma warning disable BL0005 // Setting this outside the component is fine until this is reworked
                                    Icon      = DropdownIcon(vis),
                                    Content   = DropdownContent(vis),
                                    Selection = vis

Iceshrimp.Frontend/Components/Dropdown.razor

@@ -20,6 +20,7 @@
 
     [Parameter]
     [EditorRequired]
+    #pragma warning disable BL0007 // While this implementation is suboptimal, this is technically fine. Should be reworked.
     public required TBind Value
     {
         get => _value;

Iceshrimp.Frontend/Components/FollowButton.razor

@@ -34,10 +34,9 @@
     [Parameter] [EditorRequired] public required UserProfileResponse UserProfile { get; set; }
     private                                      ButtonType          _buttonType;
 
-    protected override async Task OnInitializedAsync()
+    protected override void OnInitialized()
     {
         ChooseButton();
-        Console.WriteLine(UserProfile.Relations);
     }
 
     private enum ButtonType

Iceshrimp.Frontend/Core/Services/MessageService.cs

@@ -23,8 +23,16 @@ internal class MessageService
 
 	public void Unregister(string id, EventHandler<NoteResponse> func)
 	{
+		if (NoteChangedHandlers.ContainsKey(id))
+		{
+			#pragma warning disable CS8601 
 			NoteChangedHandlers[id] -= func;
 		}
+		else
+		{
+			throw new ArgumentException("Tried to unregister from callback that doesn't exist");
+		}
+	}
 
 	public Task UpdateNote(NoteResponse note)
 	{