refactor: extract interfaces to Interfaces folders and consolidate filters

Move interface declarations into per-area Interfaces/ subfolders, merge the
small task-list filter classes into StatusFilter/SmartFlagFilter, and simplify
related services, converters and hub DTO handling.

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

src/ClaudeDo.Ui/Services/InstallArtifactLocator.cs

@@ -0,0 +1,49 @@
+namespace ClaudeDo.Ui.Services;
+
+/// <summary>
+/// Locates an executable inside a ClaudeDo install: walk up from the running
+/// directory to the folder containing install.json, otherwise read the
+/// uninstall registry key. Subclasses supply the subdirectory and exe name.
+/// </summary>
+public abstract class InstallArtifactLocator
+{
+    private const string InstallJson = "install.json";
+
+    protected abstract string Subdir { get; }
+    protected abstract string ExeName { get; }
+
+    public string? Find()
+        => FindByWalkingUp(AppContext.BaseDirectory)
+           ?? (OperatingSystem.IsWindows() ? FindByRegistry() : null);
+
+    public string? FindByWalkingUp(string startDir)
+    {
+        var dir = new DirectoryInfo(startDir);
+        while (dir is not null)
+        {
+            if (File.Exists(Path.Combine(dir.FullName, InstallJson)))
+            {
+                var candidate = Path.Combine(dir.FullName, Subdir, ExeName);
+                return File.Exists(candidate) ? candidate : null;
+            }
+            dir = dir.Parent;
+        }
+        return null;
+    }
+
+    [System.Runtime.Versioning.SupportedOSPlatform("windows")]
+    public string? FindByRegistry()
+    {
+        if (!OperatingSystem.IsWindows()) return null;
+        try
+        {
+            using var key = Microsoft.Win32.Registry.LocalMachine
+                .OpenSubKey(@"Software\Microsoft\Windows\CurrentVersion\Uninstall\ClaudeDo");
+            var location = key?.GetValue("InstallLocation") as string;
+            if (string.IsNullOrEmpty(location)) return null;
+            var candidate = Path.Combine(location, Subdir, ExeName);
+            return File.Exists(candidate) ? candidate : null;
+        }
+        catch { return null; }
+    }
+}