Frequency navigation WIP

src/AppCommon/FileTime.App.FrequencyNavigation.Abstractions/FileTime.App.FrequencyNavigation.Abstractions.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <TargetFramework>net7.0</TargetFramework>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+    <RootNamespace>FileTime.App.FrequencyNavigation</RootNamespace>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <ProjectReference Include="..\FileTime.App.Core.Abstraction\FileTime.App.Core.Abstraction.csproj" />
+  </ItemGroup>
+
+</Project>

src/AppCommon/FileTime.App.FrequencyNavigation.Abstractions/Services/IFrequencyNavigationService.cs

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+using FileTime.App.FrequencyNavigation.ViewModels;
+
+namespace FileTime.App.FrequencyNavigation.Services;
+
+public interface IFrequencyNavigationService
+{
+    IObservable<bool> ShowWindow { get; }
+    IFrequencyNavigationViewModel? CurrentModal { get; }
+    void OpenNavigationWindow();
+    void CloseNavigationWindow();
+    IList<string> GetMatchingContainers(string searchText);
+}

src/AppCommon/FileTime.App.FrequencyNavigation.Abstractions/ViewModels/IFrequencyNavigationViewModel.cs

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+using FileTime.App.Core.ViewModels;
+
+namespace FileTime.App.FrequencyNavigation.ViewModels;
+
+public interface IFrequencyNavigationViewModel : IModalViewModel
+{
+    IObservable<bool> ShowWindow { get; }
+    List<string> FilteredMatches { get; }
+    string SearchText { get; set; }
+    string SelectedItem { get; set; }
+    void Close();
+}