refactor: modernize code, improve performance, and clean up various components.

Commands/StatsCommand.cs

@@ -1,7 +1,3 @@
-using System;
-using System.Linq;
-using System.Threading.Tasks;
-using System.CommandLine;
 using Spectre.Console;
 using Toak.Core;
 
@@ -9,7 +5,7 @@ namespace Toak.Commands;
 
 public static class StatsCommand
 {
-    public static async Task ExecuteAsync(bool verbose)
+    public static Task ExecuteAsync(bool verbose)
     {
         Logger.Verbose = verbose;
 
@@ -17,7 +13,7 @@ public static class StatsCommand
         if (entries.Count == 0)
         {
             AnsiConsole.MarkupLine("[yellow]No history found. Cannot generate statistics.[/]");
-            return;
+            return Task.CompletedTask;
         }
 
         var totalCount = entries.Count;
@@ -30,7 +26,7 @@ public static class StatsCommand
             .FirstOrDefault();
 
         var topWords = entries
-            .SelectMany(e => e.RefinedText.Split(new[] { ' ', '.', ',', '!', '?' }, StringSplitOptions.RemoveEmptyEntries))
+            .SelectMany(e => e.RefinedText.Split([' ', '.', ',', '!', '?'], StringSplitOptions.RemoveEmptyEntries))
             .Where(w => w.Length > 3) // Exclude short common words
             .GroupBy(w => w.ToLowerInvariant())
             .OrderByDescending(g => g.Count())
@@ -52,5 +48,6 @@ public static class StatsCommand
         {
             AnsiConsole.MarkupLine($"[dim]Top spoken words (>3 chars):[/] {string.Join(", ", topWords)}");
         }
+        return Task.CompletedTask;
     }
 }