Implement Google authentication (for Web) and user management system

Bimix.UI.Shared/Components/AuthGuard.razor

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+@using Bimix.UI.Shared.Services
+@inject AuthService AuthService
+@inject NavigationManager Navigation
+
+@if (_isLoading)
+{
+    <div class="d-flex justify-center align-center" style="height: 100vh;">
+        <MudProgressCircular Indeterminate="true" Size="Size.Large" />
+    </div>
+}
+else if (_isAuthenticated)
+{
+    @ChildContent
+}
+
+@code {
+    [Parameter] public RenderFragment? ChildContent { get; set; }
+    
+    private bool _isLoading = true;
+    private bool _isAuthenticated = false;
+    
+    protected override async Task OnAfterRenderAsync(bool firstRender)
+    {
+        if (firstRender)
+        {
+            Console.WriteLine("AuthGuard: Checking authentication...");
+            
+            // ZAWSZE sprawdź localStorage przy inicjalizacji
+            _isAuthenticated = await AuthService.CheckAuthenticationAsync();
+            _isLoading = false;
+            
+            Console.WriteLine($"AuthGuard: isAuthenticated={_isAuthenticated}");
+            
+            if (!_isAuthenticated)
+            {
+                Console.WriteLine("AuthGuard: Redirecting to /login");
+                Navigation.NavigateTo("/login", replace: true);
+            }
+            
+            StateHasChanged();
+        }
+    }
+}

Bimix.UI.Shared/Components/LoginCard.razor

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+@using Microsoft.Extensions.Configuration
+@using Bimix.UI.Shared.Services
+@inject IJSRuntime JS
+@inject IConfiguration Configuration
+@inject AuthService AuthService
+@inject NavigationManager NavigationManager
+
+<MudCard Class="login-card" Elevation="8">
+    <MudCardContent Class="pa-8 d-flex flex-column align-center">
+        <MudText Typo="Typo.h4" Class="mb-4">Witaj w Bimix</MudText>
+        <MudText Typo="Typo.body1" Class="mb-6 text-center">
+            Zaloguj się używając konta Google
+        </MudText>
+        
+        <MudButton
+            Variant="Variant.Filled"
+            StartIcon="@Icons.Custom.Brands.Google"
+            Size="Size.Large"
+            OnClick="HandleGoogleSignIn"
+            Disabled="@_isLoading">
+            @if (_isLoading)
+            {
+                <MudProgressCircular Class="mr-3" Size="Size.Small" Indeterminate="true"></MudProgressCircular>
+            }
+            else
+            {
+                <span>Zaloguj z Google</span>
+            }
+        </MudButton>
+        
+        @if (!string.IsNullOrEmpty(_errorMessage))
+        {
+            <MudAlert Severity="Severity.Error" Class="mt-4">
+                @_errorMessage
+            </MudAlert>
+        }
+    </MudCardContent>
+</MudCard>
+
+@code {
+    private bool _isLoading = false;
+    private string _errorMessage = string.Empty;
+    private static LoginCard? _instance;
+
+    protected override void OnInitialized()
+    {
+        _instance = this;
+    }
+
+    private async Task HandleGoogleSignIn()
+    {
+        try
+        {
+            _isLoading = true;
+            _errorMessage = string.Empty;
+            StateHasChanged();
+            
+            var clientId = Configuration["GoogleAuth:ClientId"];
+            
+            if (string.IsNullOrEmpty(clientId))
+            {
+                throw new Exception("Google ClientId is not configured.");
+            }
+
+
+            await JS.InvokeVoidAsync("initGoogleSignIn", clientId);
+        }
+        catch (Exception ex)
+        {
+            _errorMessage = "Błąd podczas logownia. Spróbuj ponownie";
+            _isLoading = false;
+            StateHasChanged();
+        }
+    }
+
+    [JSInvokable]
+    public static async Task OnGoogleSignInSuccess(string idToken)
+    {
+        Console.WriteLine($"Google ID Token: {idToken}");
+        
+        if (_instance != null)
+        {
+            await _instance.AuthService.SetAuthenticationAsync(idToken);
+            
+            _instance._isLoading = false;
+            _instance._errorMessage = string.Empty;
+            
+            _instance.NavigationManager.NavigateTo("/dashboard", replace:true);
+            
+            await _instance.InvokeAsync(() => _instance.StateHasChanged());
+        }
+    }
+
+    [JSInvokable]
+    public static async Task OnGoggleSignInError(string error)
+    {
+        Console.WriteLine($"Google SignIn Error: {error}");
+
+        if (_instance != null)
+        {
+            _instance._isLoading = false;
+            _instance._errorMessage = "Błąd logowanie Google. Spróbuj ponownie";
+            await _instance.InvokeAsync(() => _instance.StateHasChanged());
+        }
+    }
+    
+}
+
+<style>
+    .login-card {
+        max-width: 400px;
+        width: 100%;
+        background: rgba(255, 255, 255, 0.95);
+        backdrop-filter: blur(10px);
+    }
+    
+    .google-signin-button {
+        width: 100%;
+        padding: 12px 24px;
+    }
+</style>