feat: Complete Milestone 4 - Views/UI Layer

Implemented complete MVVM UI layer with data binding:

**Dependency Injection (MauiProgram.cs):**
- Registered all services as Singleton (shared state)
- Registered all ViewModels and Pages as Transient
- Configured SQLite database path

**Pages:**
- MainPage: Mode selector, estimate display, shake status
- HistoryPage: CollectionView with auto-load on appearing
- SettingsPage: Mode picker, MaxHistorySize stepper

**Value Converters:**
- IsNullConverter / IsNotNullConverter (visibility)
- BoolToShakingConverter (status text)
- BoolToColorConverter (status colors)
- InvertedBoolConverter (boolean inversion)

**Navigation:**
- AppShell with TabBar (Estimate, History, Settings)
- ContentTemplate for lazy loading

**Technical details:**
- All XAML uses x:DataType for compile-time checking
- All code-behind uses constructor injection
- Zero warnings, zero errors
- 165 tests passing (no UI tests yet)

Build verified across all platforms (net8.0, iOS, macOS Catalyst)

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

CLAUDE.md

@@ -228,19 +228,62 @@ HihaArvio.sln
 - **Coverage:** 51.28% line (low due to MAUI template), 87.5% branch
 - **Build:** 0 warnings, 0 errors across all platforms
 
+**Milestone 3: ViewModels Layer (✅ Complete)**
+- MainViewModel (18 tests)
+  - Coordinates shake detection and estimate generation
+  - Subscribes to ShakeDetectionService.ShakeDataChanged event
+  - Detects shake stop (transition from shaking → not shaking)
+  - Mode selection and current estimate display
+  - Implements IDisposable for cleanup
+- HistoryViewModel (15 tests)
+  - Manages estimate history display with ObservableCollection
+  - LoadHistoryCommand for async history retrieval
+  - ClearHistoryCommand for pruning
+  - IsEmpty property for empty state handling
+- SettingsViewModel (13 tests)
+  - Settings management (SelectedMode, MaxHistorySize)
+  - SaveSettingsCommand for persistence
+  - Auto-loads settings on initialization
+- All ViewModels use CommunityToolkit.Mvvm source generators
+  - [ObservableProperty] for property change notifications
+  - [RelayCommand] for commands
+- **Total: 165 tests, all passing (119 services + 46 ViewModels)**
+- **Build:** 0 warnings, 0 errors across all platforms
+
+**Milestone 4: Views/UI Layer (✅ Complete)**
+- Dependency Injection configuration in MauiProgram.cs
+  - All services registered as Singleton
+  - All ViewModels and Pages registered as Transient
+  - SQLite database path configured with FileSystem.AppDataDirectory
+- MainPage.xaml with data binding
+  - Mode selector (Work/Generic)
+  - Current estimate display with conditional visibility
+  - Shake status indicator
+  - Uses x:DataType for compile-time binding verification
+- HistoryPage.xaml with data binding
+  - CollectionView with ItemTemplate
+  - Empty state when no history
+  - Refresh and Clear All buttons
+  - Auto-loads history on OnAppearing()
+- SettingsPage.xaml with data binding
+  - Picker for mode selection (Work/Generic only - Humorous is easter egg)
+  - Stepper for MaxHistorySize (5-100, increment by 5)
+  - Save Settings button
+  - About section with easter egg hint
+- Value Converters for UI logic
+  - IsNullConverter / IsNotNullConverter (conditional visibility)
+  - BoolToShakingConverter (status text)
+  - BoolToColorConverter (status colors)
+  - InvertedBoolConverter (boolean inversion)
+  - All registered in App.xaml resources
+- AppShell.xaml navigation
+  - TabBar with 3 tabs: Estimate, History, Settings
+  - Each tab uses ContentTemplate for lazy loading
+- **Total: 165 tests still passing (no UI tests yet)**
+- **Build:** 0 warnings, 0 errors across all platforms (net8.0, iOS, macOS Catalyst)
+
 ### Remaining Work
 
-**Milestone 3: ViewModels Layer** (Not Started)
-- MainViewModel (estimate display, settings)
-- HistoryViewModel (estimate history)
-- SettingsViewModel (mode selection, history management)
-
-**Milestone 4: Views/UI Layer** (Not Started)
-- MainPage (shake screen, estimate display)
-- HistoryPage (estimate list)
-- SettingsPage (mode toggle, history clear)
-- Navigation infrastructure
-
 **Milestone 5: Platform-Specific Implementations** (Not Started)
 - IAccelerometerService interface
 - iOS implementation (real accelerometer)

src/HihaArvio/App.xaml

@@ -2,6 +2,7 @@
 <Application xmlns="http://schemas.microsoft.com/dotnet/2021/maui"
              xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
              xmlns:local="clr-namespace:HihaArvio"
+             xmlns:converters="clr-namespace:HihaArvio.Converters"
              x:Class="HihaArvio.App">
     <Application.Resources>
         <ResourceDictionary>
@@ -9,6 +10,13 @@
                 <ResourceDictionary Source="Resources/Styles/Colors.xaml" />
                 <ResourceDictionary Source="Resources/Styles/Styles.xaml" />
             </ResourceDictionary.MergedDictionaries>
+
+            <!-- Value Converters -->
+            <converters:IsNullConverter x:Key="IsNullConverter"/>
+            <converters:IsNotNullConverter x:Key="IsNotNullConverter"/>
+            <converters:BoolToShakingConverter x:Key="BoolToShakingConverter"/>
+            <converters:BoolToColorConverter x:Key="BoolToColorConverter"/>
+            <converters:InvertedBoolConverter x:Key="InvertedBoolConverter"/>
         </ResourceDictionary>
     </Application.Resources>
 </Application>

src/HihaArvio/AppShell.xaml

@@ -4,12 +4,26 @@
     xmlns="http://schemas.microsoft.com/dotnet/2021/maui"
     xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
     xmlns:local="clr-namespace:HihaArvio"
-    Shell.FlyoutBehavior="Disabled"
-    Title="HihaArvio">
+    Title="Hiha-Arvio">
 
-    <ShellContent
-        Title="Home"
-        ContentTemplate="{DataTemplate local:MainPage}"
-        Route="MainPage" />
+    <TabBar>
+        <ShellContent
+            Title="Estimate"
+            Icon="home.png"
+            ContentTemplate="{DataTemplate local:MainPage}"
+            Route="MainPage" />
+
+        <ShellContent
+            Title="History"
+            Icon="history.png"
+            ContentTemplate="{DataTemplate local:HistoryPage}"
+            Route="HistoryPage" />
+
+        <ShellContent
+            Title="Settings"
+            Icon="settings.png"
+            ContentTemplate="{DataTemplate local:SettingsPage}"
+            Route="SettingsPage" />
+    </TabBar>
 
 </Shell>

src/HihaArvio/Converters/BoolToColorConverter.cs

@@ -0,0 +1,20 @@
+using System.Globalization;
+
+namespace HihaArvio.Converters;
+
+public class BoolToColorConverter : IValueConverter
+{
+    public object? Convert(object? value, Type targetType, object? parameter, CultureInfo culture)
+    {
+        if (value is bool isShaking)
+        {
+            return isShaking ? Colors.Green : Colors.Gray;
+        }
+        return Colors.Gray;
+    }
+
+    public object? ConvertBack(object? value, Type targetType, object? parameter, CultureInfo culture)
+    {
+        throw new NotImplementedException();
+    }
+}

src/HihaArvio/Converters/BoolToShakingConverter.cs

@@ -0,0 +1,20 @@
+using System.Globalization;
+
+namespace HihaArvio.Converters;
+
+public class BoolToShakingConverter : IValueConverter
+{
+    public object? Convert(object? value, Type targetType, object? parameter, CultureInfo culture)
+    {
+        if (value is bool isShaking)
+        {
+            return isShaking ? "Shaking" : "Idle";
+        }
+        return "Unknown";
+    }
+
+    public object? ConvertBack(object? value, Type targetType, object? parameter, CultureInfo culture)
+    {
+        throw new NotImplementedException();
+    }
+}

src/HihaArvio/Converters/InvertedBoolConverter.cs

@@ -0,0 +1,16 @@
+using System.Globalization;
+
+namespace HihaArvio.Converters;
+
+public class InvertedBoolConverter : IValueConverter
+{
+    public object? Convert(object? value, Type targetType, object? parameter, CultureInfo culture)
+    {
+        return value is bool boolValue && !boolValue;
+    }
+
+    public object? ConvertBack(object? value, Type targetType, object? parameter, CultureInfo culture)
+    {
+        return value is bool boolValue && !boolValue;
+    }
+}

src/HihaArvio/Converters/IsNullConverter.cs

@@ -0,0 +1,29 @@
+using System.Globalization;
+
+namespace HihaArvio.Converters;
+
+public class IsNullConverter : IValueConverter
+{
+    public object? Convert(object? value, Type targetType, object? parameter, CultureInfo culture)
+    {
+        return value is null;
+    }
+
+    public object? ConvertBack(object? value, Type targetType, object? parameter, CultureInfo culture)
+    {
+        throw new NotImplementedException();
+    }
+}
+
+public class IsNotNullConverter : IValueConverter
+{
+    public object? Convert(object? value, Type targetType, object? parameter, CultureInfo culture)
+    {
+        return value is not null;
+    }
+
+    public object? ConvertBack(object? value, Type targetType, object? parameter, CultureInfo culture)
+    {
+        throw new NotImplementedException();
+    }
+}

src/HihaArvio/HistoryPage.xaml

@@ -0,0 +1,96 @@
+<?xml version="1.0" encoding="utf-8" ?>
+<ContentPage xmlns="http://schemas.microsoft.com/dotnet/2021/maui"
+             xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
+             xmlns:viewmodels="clr-namespace:HihaArvio.ViewModels"
+             xmlns:models="clr-namespace:HihaArvio.Models"
+             x:Class="HihaArvio.HistoryPage"
+             x:DataType="viewmodels:HistoryViewModel"
+             Title="History">
+
+    <Grid RowDefinitions="Auto,*">
+
+        <!-- Toolbar -->
+        <HorizontalStackLayout Grid.Row="0" Padding="15" Spacing="10">
+            <Button Text="Refresh"
+                    Command="{Binding LoadHistoryCommand}"
+                    HorizontalOptions="FillAndExpand"/>
+            <Button Text="Clear All"
+                    Command="{Binding ClearHistoryCommand}"
+                    BackgroundColor="{StaticResource Danger}"
+                    HorizontalOptions="FillAndExpand"/>
+        </HorizontalStackLayout>
+
+        <!-- Empty State -->
+        <VerticalStackLayout Grid.Row="1"
+                             IsVisible="{Binding IsEmpty}"
+                             VerticalOptions="Center"
+                             HorizontalOptions="Center"
+                             Padding="20">
+            <Label Text="No history yet"
+                   FontSize="24"
+                   FontAttributes="Bold"
+                   HorizontalTextAlignment="Center"
+                   TextColor="{StaticResource Gray600}"/>
+            <Label Text="Shake your device to generate estimates"
+                   FontSize="16"
+                   HorizontalTextAlignment="Center"
+                   TextColor="{StaticResource Gray500}"
+                   Margin="0,10,0,0"/>
+        </VerticalStackLayout>
+
+        <!-- History List -->
+        <CollectionView Grid.Row="1"
+                        ItemsSource="{Binding History}"
+                        IsVisible="{Binding IsEmpty, Converter={StaticResource InvertedBoolConverter}}"
+                        Margin="10">
+            <CollectionView.ItemTemplate>
+                <DataTemplate x:DataType="models:EstimateResult">
+                    <Frame Padding="15" Margin="5" HasShadow="True">
+                        <Grid RowDefinitions="Auto,Auto,Auto" ColumnDefinitions="*,Auto" RowSpacing="8">
+
+                            <!-- Estimate Text -->
+                            <Label Grid.Row="0" Grid.Column="0"
+                                   Text="{Binding EstimateText}"
+                                   FontSize="24"
+                                   FontAttributes="Bold"
+                                   TextColor="{StaticResource Primary}"/>
+
+                            <!-- Mode Badge -->
+                            <Frame Grid.Row="0" Grid.Column="1"
+                                   Padding="8,4"
+                                   BackgroundColor="{StaticResource Secondary}"
+                                   CornerRadius="12"
+                                   HasShadow="False">
+                                <Label Text="{Binding Mode}"
+                                       FontSize="12"
+                                       TextColor="White"/>
+                            </Frame>
+
+                            <!-- Timestamp -->
+                            <Label Grid.Row="1" Grid.Column="0" Grid.ColumnSpan="2"
+                                   Text="{Binding Timestamp, StringFormat='{0:MMM d, yyyy h:mm tt}'}"
+                                   FontSize="14"
+                                   TextColor="{StaticResource Gray600}"/>
+
+                            <!-- Shake Details -->
+                            <Label Grid.Row="2" Grid.Column="0" Grid.ColumnSpan="2"
+                                   FontSize="12"
+                                   TextColor="{StaticResource Gray500}">
+                                <Label.FormattedText>
+                                    <FormattedString>
+                                        <Span Text="Intensity: "/>
+                                        <Span Text="{Binding ShakeIntensity, StringFormat='{0:P0}'}" FontAttributes="Bold"/>
+                                        <Span Text=" | Duration: "/>
+                                        <Span Text="{Binding ShakeDuration, StringFormat='{0:0.0}s'}" FontAttributes="Bold"/>
+                                    </FormattedString>
+                                </Label.FormattedText>
+                            </Label>
+                        </Grid>
+                    </Frame>
+                </DataTemplate>
+            </CollectionView.ItemTemplate>
+        </CollectionView>
+
+    </Grid>
+
+</ContentPage>

src/HihaArvio/HistoryPage.xaml.cs

@@ -0,0 +1,23 @@
+using HihaArvio.ViewModels;
+
+namespace HihaArvio;
+
+public partial class HistoryPage : ContentPage
+{
+    public HistoryPage(HistoryViewModel viewModel)
+    {
+        InitializeComponent();
+        BindingContext = viewModel;
+    }
+
+    protected override async void OnAppearing()
+    {
+        base.OnAppearing();
+
+        // Load history when page appears
+        if (BindingContext is HistoryViewModel viewModel)
+        {
+            await viewModel.LoadHistoryCommand.ExecuteAsync(null);
+        }
+    }
+}

src/HihaArvio/MainPage.xaml

@@ -1,35 +1,107 @@
-<?xml version="1.0" encoding="utf-8" ?>
+<?xml version="1.0" encoding="utf-8" ?>
 <ContentPage xmlns="http://schemas.microsoft.com/dotnet/2021/maui"
              xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
-             x:Class="HihaArvio.MainPage">
+             xmlns:viewmodels="clr-namespace:HihaArvio.ViewModels"
+             xmlns:models="clr-namespace:HihaArvio.Models"
+             x:Class="HihaArvio.MainPage"
+             x:DataType="viewmodels:MainViewModel"
+             Title="Hiha-Arvio">
 
     <ScrollView>
-        <VerticalStackLayout
-            Padding="30,0"
-            Spacing="25">
-            <Image
-                Source="dotnet_bot.png"
-                HeightRequest="185"
-                Aspect="AspectFit"
-                SemanticProperties.Description="dot net bot in a race car number eight" />
+        <VerticalStackLayout Padding="20" Spacing="20">
 
-            <Label
-                Text="Hello, World!"
-                Style="{StaticResource Headline}"
-                SemanticProperties.HeadingLevel="Level1" />
+            <!-- Mode Selector -->
+            <Frame BorderColor="{StaticResource Primary}" Padding="10">
+                <VerticalStackLayout Spacing="10">
+                    <Label Text="Estimation Mode"
+                           FontSize="18"
+                           FontAttributes="Bold"/>
+                    <Picker SelectedItem="{Binding SelectedMode}">
+                        <Picker.ItemsSource>
+                            <x:Array Type="{x:Type models:EstimateMode}">
+                                <models:EstimateMode>Work</models:EstimateMode>
+                                <models:EstimateMode>Generic</models:EstimateMode>
+                            </x:Array>
+                        </Picker.ItemsSource>
+                    </Picker>
+                </VerticalStackLayout>
+            </Frame>
 
-            <Label
-                Text="Welcome to &#10;.NET Multi-platform App UI"
-                Style="{StaticResource SubHeadline}"
-                SemanticProperties.HeadingLevel="Level2"
-                SemanticProperties.Description="Welcome to dot net Multi platform App U I" />
+            <!-- Shake Instruction / Current Estimate Display -->
+            <Frame BorderColor="{StaticResource Primary}"
+                   Padding="30"
+                   HasShadow="True"
+                   MinimumHeightRequest="200">
+                <VerticalStackLayout Spacing="15"
+                                     VerticalOptions="Center"
+                                     HorizontalOptions="Center">
+
+                    <!-- Show instruction when no estimate -->
+                    <Label Text="Shake your device to generate an estimate"
+                           FontSize="20"
+                           HorizontalTextAlignment="Center"
+                           TextColor="{StaticResource Gray600}"
+                           IsVisible="{Binding CurrentEstimate, Converter={StaticResource IsNullConverter}}"/>
+
+                    <!-- Show estimate when available -->
+                    <VerticalStackLayout Spacing="10"
+                                         IsVisible="{Binding CurrentEstimate, Converter={StaticResource IsNotNullConverter}}">
+                        <Label Text="Estimated Time:"
+                               FontSize="16"
+                               HorizontalTextAlignment="Center"
+                               TextColor="{StaticResource Gray600}"/>
+                        <Label Text="{Binding CurrentEstimate.EstimateText}"
+                               FontSize="32"
+                               FontAttributes="Bold"
+                               HorizontalTextAlignment="Center"
+                               TextColor="{StaticResource Primary}"/>
+                        <Label FontSize="14"
+                               HorizontalTextAlignment="Center"
+                               TextColor="{StaticResource Gray500}">
+                            <Label.FormattedText>
+                                <FormattedString>
+                                    <Span Text="Mode: "/>
+                                    <Span Text="{Binding CurrentEstimate.Mode}" FontAttributes="Bold"/>
+                                    <Span Text=" | Intensity: "/>
+                                    <Span Text="{Binding CurrentEstimate.ShakeIntensity, StringFormat='{0:P0}'}" FontAttributes="Bold"/>
+                                </FormattedString>
+                            </Label.FormattedText>
+                        </Label>
+                    </VerticalStackLayout>
+                </VerticalStackLayout>
+            </Frame>
+
+            <!-- Current Shake Data (Debug Info) -->
+            <Frame BorderColor="{StaticResource Secondary}" Padding="15">
+                <VerticalStackLayout Spacing="10">
+                    <Label Text="Shake Status"
+                           FontSize="18"
+                           FontAttributes="Bold"/>
+
+                    <Grid ColumnDefinitions="Auto,*" RowDefinitions="Auto,Auto,Auto" ColumnSpacing="10" RowSpacing="5">
+                        <Label Grid.Row="0" Grid.Column="0" Text="Status:" FontAttributes="Bold"/>
+                        <Label Grid.Row="0" Grid.Column="1"
+                               Text="{Binding CurrentShakeData.IsShaking, Converter={StaticResource BoolToShakingConverter}}"
+                               TextColor="{Binding CurrentShakeData.IsShaking, Converter={StaticResource BoolToColorConverter}}"/>
+
+                        <Label Grid.Row="1" Grid.Column="0" Text="Intensity:" FontAttributes="Bold"/>
+                        <Label Grid.Row="1" Grid.Column="1"
+                               Text="{Binding CurrentShakeData.Intensity, StringFormat='{0:P0}'}"/>
+
+                        <Label Grid.Row="2" Grid.Column="0" Text="Duration:" FontAttributes="Bold"/>
+                        <Label Grid.Row="2" Grid.Column="1"
+                               Text="{Binding CurrentShakeData.Duration, StringFormat='{0:0.0} seconds'}"/>
+                    </Grid>
+                </VerticalStackLayout>
+            </Frame>
+
+            <!-- Info Text -->
+            <Label Text="Note: Shake detection requires accelerometer support. Desktop users: feature coming soon!"
+                   FontSize="12"
+                   TextColor="{StaticResource Gray500}"
+                   HorizontalTextAlignment="Center"
+                   Margin="0,10,0,0"/>
 
-            <Button
-                x:Name="CounterBtn"
-                Text="Click me" 
-                SemanticProperties.Hint="Counts the number of times you click"
-                Clicked="OnCounterClicked"
-                HorizontalOptions="Fill" />
         </VerticalStackLayout>
     </ScrollView>
 

src/HihaArvio/MainPage.xaml.cs

@@ -1,24 +1,12 @@
-namespace HihaArvio;
+using HihaArvio.ViewModels;
+
+namespace HihaArvio;
 
 public partial class MainPage : ContentPage
 {
-	int count = 0;
-
-	public MainPage()
-	{
-		InitializeComponent();
-	}
-
-	private void OnCounterClicked(object sender, EventArgs e)
-	{
-		count++;
-
-		if (count == 1)
-			CounterBtn.Text = $"Clicked {count} time";
-		else
-			CounterBtn.Text = $"Clicked {count} times";
-
-		SemanticScreenReader.Announce(CounterBtn.Text);
-	}
+    public MainPage(MainViewModel viewModel)
+    {
+        InitializeComponent();
+        BindingContext = viewModel;
+    }
 }
-

src/HihaArvio/MauiProgram.cs

@@ -1,4 +1,7 @@
-using Microsoft.Extensions.Logging;
+using HihaArvio.Services;
+using HihaArvio.Services.Interfaces;
+using HihaArvio.ViewModels;
+using Microsoft.Extensions.Logging;
 
 namespace HihaArvio;
 
@@ -19,6 +22,24 @@ public static class MauiProgram
 		builder.Logging.AddDebug();
 #endif
 
+		// Register Services
+		builder.Services.AddSingleton<IEstimateService, EstimateService>();
+		builder.Services.AddSingleton<IShakeDetectionService, ShakeDetectionService>();
+
+		// Storage service with app data path
+		var dbPath = Path.Combine(FileSystem.AppDataDirectory, "hihaarvio.db");
+		builder.Services.AddSingleton<IStorageService>(sp => new StorageService(dbPath));
+
+		// Register ViewModels
+		builder.Services.AddTransient<MainViewModel>();
+		builder.Services.AddTransient<HistoryViewModel>();
+		builder.Services.AddTransient<SettingsViewModel>();
+
+		// Register Pages
+		builder.Services.AddTransient<MainPage>();
+		builder.Services.AddTransient<HistoryPage>();
+		builder.Services.AddTransient<SettingsPage>();
+
 		return builder.Build();
 	}
 }

src/HihaArvio/SettingsPage.xaml

@@ -0,0 +1,113 @@
+<?xml version="1.0" encoding="utf-8" ?>
+<ContentPage xmlns="http://schemas.microsoft.com/dotnet/2021/maui"
+             xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
+             xmlns:viewmodels="clr-namespace:HihaArvio.ViewModels"
+             xmlns:models="clr-namespace:HihaArvio.Models"
+             x:Class="HihaArvio.SettingsPage"
+             x:DataType="viewmodels:SettingsViewModel"
+             Title="Settings">
+
+    <ScrollView>
+        <VerticalStackLayout Padding="20" Spacing="20">
+
+            <!-- Estimation Mode Section -->
+            <Frame BorderColor="{StaticResource Primary}" Padding="15">
+                <VerticalStackLayout Spacing="10">
+                    <Label Text="Estimation Mode"
+                           FontSize="20"
+                           FontAttributes="Bold"/>
+                    <Label Text="Choose the type of estimates you want to generate"
+                           FontSize="14"
+                           TextColor="{StaticResource Gray600}"
+                           Margin="0,0,0,10"/>
+
+                    <Picker SelectedItem="{Binding SelectedMode}">
+                        <Picker.ItemsSource>
+                            <x:Array Type="{x:Type models:EstimateMode}">
+                                <models:EstimateMode>Work</models:EstimateMode>
+                                <models:EstimateMode>Generic</models:EstimateMode>
+                            </x:Array>
+                        </Picker.ItemsSource>
+                    </Picker>
+
+                    <Label FontSize="12" TextColor="{StaticResource Gray500}" Margin="0,5,0,0">
+                        <Label.FormattedText>
+                            <FormattedString>
+                                <Span Text="Work" FontAttributes="Bold"/>
+                                <Span Text=": Project and task estimates (hours, days, weeks)"/><Span Text="&#10;"/>
+                                <Span Text="Generic" FontAttributes="Bold"/>
+                                <Span Text=": General time durations (minutes, hours)"/>
+                            </FormattedString>
+                        </Label.FormattedText>
+                    </Label>
+                </VerticalStackLayout>
+            </Frame>
+
+            <!-- History Settings Section -->
+            <Frame BorderColor="{StaticResource Primary}" Padding="15">
+                <VerticalStackLayout Spacing="10">
+                    <Label Text="History Settings"
+                           FontSize="20"
+                           FontAttributes="Bold"/>
+                    <Label Text="Maximum number of estimates to keep in history"
+                           FontSize="14"
+                           TextColor="{StaticResource Gray600}"
+                           Margin="0,0,0,10"/>
+
+                    <HorizontalStackLayout Spacing="15">
+                        <Label Text="Max History Size:"
+                               VerticalOptions="Center"
+                               FontSize="16"/>
+                        <Stepper Value="{Binding MaxHistorySize}"
+                                 Minimum="5"
+                                 Maximum="100"
+                                 Increment="5"
+                                 VerticalOptions="Center"/>
+                        <Label Text="{Binding MaxHistorySize}"
+                               VerticalOptions="Center"
+                               FontSize="18"
+                               FontAttributes="Bold"
+                               TextColor="{StaticResource Primary}"/>
+                    </HorizontalStackLayout>
+
+                    <Label Text="Older estimates will be automatically removed when this limit is reached"
+                           FontSize="12"
+                           TextColor="{StaticResource Gray500}"
+                           Margin="0,10,0,0"/>
+                </VerticalStackLayout>
+            </Frame>
+
+            <!-- Save Button -->
+            <Button Text="Save Settings"
+                    Command="{Binding SaveSettingsCommand}"
+                    FontSize="18"
+                    Padding="15"
+                    Margin="0,10,0,0"/>
+
+            <!-- Info Section -->
+            <Frame BorderColor="{StaticResource Secondary}" Padding="15" Margin="0,20,0,0">
+                <VerticalStackLayout Spacing="10">
+                    <Label Text="About Hiha-Arvio"
+                           FontSize="18"
+                           FontAttributes="Bold"/>
+                    <Label FontSize="14" TextColor="{StaticResource Gray600}">
+                        <Label.FormattedText>
+                            <FormattedString>
+                                <Span Text="Hiha-Arvio ("/>
+                                <Span Text="Sleeve Estimate" FontAttributes="Italic"/>
+                                <Span Text=") generates semi-random time estimates based on shake intensity. Perfect for those moments when you need to pull an estimate from your sleeve!"/>
+                            </FormattedString>
+                        </Label.FormattedText>
+                    </Label>
+                    <Label Text="Easter Egg: Try shaking for more than 15 seconds..."
+                           FontSize="12"
+                           TextColor="{StaticResource Gray500}"
+                           FontAttributes="Italic"
+                           Margin="0,10,0,0"/>
+                </VerticalStackLayout>
+            </Frame>
+
+        </VerticalStackLayout>
+    </ScrollView>
+
+</ContentPage>

src/HihaArvio/SettingsPage.xaml.cs

@@ -0,0 +1,12 @@
+using HihaArvio.ViewModels;
+
+namespace HihaArvio;
+
+public partial class SettingsPage : ContentPage
+{
+    public SettingsPage(SettingsViewModel viewModel)
+    {
+        InitializeComponent();
+        BindingContext = viewModel;
+    }
+}