fix: Profile.razor use ISessionStore directly + forceLoad for Discord link

- Replace HttpClient API calls with direct ISessionStore DI to avoid
  302 redirect from missing auth cookie in Blazor Server interactive mode
- Use NavigationManager.NavigateTo with forceLoad=true for Discord OAuth
  to bypass Blazor circuit navigation and trigger full HTTP request

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

src/GmRelay.Web/Components/Pages/Profile.razor

@@ -1,9 +1,8 @@
 @page "/profile"
 @using Microsoft.AspNetCore.Authorization
 @using Microsoft.AspNetCore.Components.Authorization
-@using System.Net.Http.Json
 @attribute [Authorize]
-@inject IHttpClientFactory HttpClientFactory
+@inject ISessionStore SessionStore
 @inject NavigationManager Navigation
 
 <PageTitle>Профиль — GM-Relay</PageTitle>
@@ -55,9 +54,9 @@
         <h2 class="section-title">Добавить аккаунт</h2>
         @if (!HasLinkedPlatform("Discord"))
         {
-            <a class="btn btn-primary" href="/auth/discord">
+            <button class="btn btn-primary" @onclick="LinkDiscord">
                 Привязать Discord
-            </a>
+            </button>
         }
         else
         {
@@ -107,9 +106,14 @@
     {
         try
         {
-            var http = HttpClientFactory.CreateClient();
-            http.BaseAddress = new Uri(Navigation.BaseUri);
-            identities = await http.GetFromJsonAsync<List<LinkedIdentity>>("api/me/identities");
+            if (currentPlatform is not null && currentExternalUserId is not null)
+            {
+                identities = await SessionStore.GetLinkedIdentitiesAsync(currentPlatform, currentExternalUserId);
+            }
+            else
+            {
+                identities = [];
+            }
         }
         catch (Exception ex)
         {
@@ -130,19 +134,19 @@
 
         try
         {
-            var http = HttpClientFactory.CreateClient();
-            http.BaseAddress = new Uri(Navigation.BaseUri);
-            var response = await http.DeleteAsync($"api/me/identities/{Uri.EscapeDataString(platform)}/{Uri.EscapeDataString(externalUserId)}");
-            if (response.IsSuccessStatusCode)
+            if (currentPlatform is null || currentExternalUserId is null)
             {
-                successMessage = $"{platform} аккаунт отвязан.";
-                await LoadIdentities();
-            }
-            else
-            {
-                var body = await response.Content.ReadAsStringAsync();
-                errorMessage = $"Ошибка отвязки: {body}";
+                errorMessage = "Не удалось определить текущего пользователя.";
+                return;
             }
+
+            await SessionStore.UnlinkIdentityAsync(currentPlatform, currentExternalUserId, platform, externalUserId);
+            successMessage = $"{platform} аккаунт отвязан.";
+            await LoadIdentities();
+        }
+        catch (InvalidOperationException ex)
+        {
+            errorMessage = $"Ошибка отвязки: {ex.Message}";
         }
         catch (Exception ex)
         {
@@ -153,4 +157,9 @@
             isUnlinking = false;
         }
     }
+
+    private void LinkDiscord()
+    {
+        Navigation.NavigateTo("/auth/discord", forceLoad: true);
+    }
 }