Initial commit: NexusArchitect Professional Workstation Overhaul

src/NexusReader.UI.Shared/Services/FocusModeService.cs

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+using Microsoft.JSInterop;
+
+namespace NexusReader.UI.Shared.Services;
+
+public sealed class FocusModeService : IFocusModeService
+{
+    private readonly IJSRuntime _jsRuntime;
+    public bool IsFocusModeActive { get; private set; }
+    public event Action? OnFocusModeChanged;
+
+    public FocusModeService(IJSRuntime jsRuntime)
+    {
+        _jsRuntime = jsRuntime;
+    }
+
+    public async Task InitializeAsync()
+    {
+        try
+        {
+            var value = await _jsRuntime.InvokeAsync<string>("localStorage.getItem", "nexus_focus_mode");
+            if (value == "true" && !IsFocusModeActive)
+            {
+                IsFocusModeActive = true;
+                OnFocusModeChanged?.Invoke();
+            }
+        }
+        catch
+        {
+            // Ignored during pre-rendering or unsupported environments
+        }
+    }
+
+    public async Task ToggleAsync()
+    {
+        IsFocusModeActive = !IsFocusModeActive;
+        OnFocusModeChanged?.Invoke();
+
+        try
+        {
+            await _jsRuntime.InvokeVoidAsync("localStorage.setItem", "nexus_focus_mode", IsFocusModeActive ? "true" : "false");
+        }
+        catch { }
+    }
+}

src/NexusReader.UI.Shared/Services/IFocusModeService.cs

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+namespace NexusReader.UI.Shared.Services;
+
+public interface IFocusModeService
+{
+    bool IsFocusModeActive { get; }
+    event Action? OnFocusModeChanged;
+    Task InitializeAsync();
+    Task ToggleAsync();
+}

src/NexusReader.UI.Shared/Services/IQuizStateService.cs

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+namespace NexusReader.UI.Shared.Services;
+
+public interface IQuizStateService
+{
+    string? CurrentQuizBlockId { get; }
+    event Action<string>? OnQuizRequested;
+    void RequestQuiz(string blockId);
+}

src/NexusReader.UI.Shared/Services/IThemeService.cs

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+namespace NexusReader.UI.Shared.Services;
+
+public interface IThemeService
+{
+    bool IsLightMode { get; }
+    event Action? OnThemeChanged;
+    void ToggleTheme();
+}

src/NexusReader.UI.Shared/Services/QuizStateService.cs

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+namespace NexusReader.UI.Shared.Services;
+
+public sealed class QuizStateService : IQuizStateService
+{
+    public string? CurrentQuizBlockId { get; private set; }
+    public event Action<string>? OnQuizRequested;
+
+    public void RequestQuiz(string blockId)
+    {
+        CurrentQuizBlockId = blockId;
+        OnQuizRequested?.Invoke(blockId);
+    }
+}

src/NexusReader.UI.Shared/Services/ThemeService.cs

@@ -0,0 +1,13 @@
+namespace NexusReader.UI.Shared.Services;
+
+public sealed class ThemeService : IThemeService
+{
+    public bool IsLightMode { get; private set; } = false;
+    public event Action? OnThemeChanged;
+
+    public void ToggleTheme()
+    {
+        IsLightMode = !IsLightMode;
+        OnThemeChanged?.Invoke();
+    }
+}