Lists: made on /lists, read as a tab of the feed

A persona's lists (PrivaPub's /api/v1/lists): made, renamed, given a
replies policy and made exclusive on /lists, filled from the accounts it
follows (accounts/search?following=true), and read as the feed's Lists tab.
A followed account's profile has a Lists menu to put it in or take it out.
ListService does the calls; the e2e tests check each step against
PrivaPub's own answer.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01LsXgEaXee4GCU1hwYgPJXw

Pages/Profile.razor

@@ -56,6 +56,30 @@
 									@FollowLabel
 								</DButton>
 							}
+							@if (relationship?.Following == true)
+							{
+								<DDropdown @bind-IsOpen="isListMenuOpen" Align="DDropdownAlign.End" TriggerClass="btn btn-sm"
+										   ContentClass="mt-2 flex flex-col gap-2 p-3 rounded-box w-64 bg-base-100 neo-raised neo-xs z-20" title="@Localizer["Lists"]">
+									<Trigger>
+										<i class="ion-md-list"></i><span>@Localizer["Lists"]</span>
+									</Trigger>
+									<ChildContent>
+										@if (allLists.Count == 0)
+										{
+											<p class="text-xs opacity-70">@Localizer["This persona has no list yet."]</p>
+										}
+										@foreach (var list in allLists)
+										{
+											<label class="label text-sm" data-list-id="@list.Id">
+												<input type="checkbox" class="checkbox checkbox-sm" checked="@inLists.Contains(list.Id)" disabled="@(IsDefaultDisabled || isActing)"
+													   @onchange="@((ChangeEventArgs e) => SetListMember(list, e.Value is true))" />
+												<span class="truncate">@list.Title</span>
+											</label>
+										}
+										<a class="btn btn-xs" href="lists"><i class="ion-md-create"></i><span>@Localizer["Manage lists"]</span></a>
+									</ChildContent>
+								</DDropdown>
+							}
 							<DButton Size="DSize.Sm" Disabled="@(IsDefaultDisabled || isActing || relationship is null)"
 									 OnClick="@(() => Do(relationship?.Muting == true ? AccountAction.Unmute : AccountAction.Mute))">
 								<i class="@(relationship?.Muting == true ? "ion-md-eye" : "ion-md-eye-off")"></i>
@@ -140,6 +164,7 @@
 
 @code {
 	[Inject] AccountService AccountService { get; set; }
+	[Inject] ListService ListService { get; set; }
 	[Inject] InstanceService InstanceService { get; set; }
 	[Inject] ILocalStorageService LocalStorage { get; set; }
 	[Inject] IJSRuntime JS { get; set; }
@@ -155,6 +180,9 @@
 	string loadedPersonaId;
 	bool isActing;
 	bool isLoadingMore;
+	bool isListMenuOpen;
+	List<MastodonList> allLists = [];
+	HashSet<string> inLists = [];
 
 	bool IsOwn => account is not null && account.Id == CascadingState.PersonaId;
 
@@ -197,12 +225,44 @@
 			return;
 		}
 		relationship = account.Id == CascadingState.PersonaId ? null : await AccountService.Relationship(account.Id);
+		await LoadLists();
 		posts = [];
 		maxId = null;
 		IsLoading = false;
 		await LoadPage();
 	}
 
+	/// <summary>The persona's lists and which of them hold the account, for an account the persona follows.</summary>
+	async Task LoadLists()
+	{
+		if (relationship?.Following != true)
+		{
+			allLists = [];
+			inLists = [];
+			return;
+		}
+		allLists = await ListService.All();
+		inLists = [.. (await ListService.Of(account.Id)).Select(l => l.Id)];
+	}
+
+	async Task SetListMember(MastodonList list, bool member)
+	{
+		isActing = true;
+		var result = await ListService.SetMember(list.Id, account.Id, member);
+		isActing = false;
+		if (result.IsInvalid)
+		{
+			Toast.AddResponseError(result);
+			return;
+		}
+
+		if (member)
+			inLists.Add(list.Id);
+		else
+			inLists.Remove(list.Id);
+		Toast.AddResponseSuccess(member ? Localizer["{0} added to {1}.", account.Name, list.Title] : Localizer["{0} removed from {1}.", account.Name, list.Title]);
+	}
+
 	async Task LoadPage()
 	{
 		isLoadingMore = true;
@@ -247,6 +307,8 @@
 		}
 
 		relationship = (Relationship)result.Data ?? relationship;
+		if (action is AccountAction.Follow or AccountAction.Unfollow)
+			await LoadLists();
 		Toast.AddResponseSuccess(action switch
 		{
 			AccountAction.Follow when relationship?.Requested == true => Localizer["Asked {0} to accept you.", account.Name],