feat: Add solo mode functionality to repository toolbar

- Add a new localization string for solo mode functionality on HEAD.
- Add a solo mode button to the repository toolbar for toggling the current head view.
- Add solo commit filter mode for the current HEAD branch.
- Add "HEAD" & `HEAD_SHA` both is useful/comparable while `HEAD` is Changed

Author: heartacker

src/ViewModels/Repository.cs

@@ -1,6 +1,7 @@
 using System;
 using System.Collections.Generic;
 using System.IO;
+using System.Linq;
 using System.Text;
 using System.Text.Json;
 using System.Threading;
@@ -1062,10 +1063,13 @@ public void SetTagFilterMode(Models.Tag tag, Models.FilterMode mode)
             if (changed)
                 RefreshHistoriesFilters(true);
         }
+
         public void SetSoloCommitFilterMode(Models.Commit commit, Models.FilterMode mode)
-        {
-            SetSoloCommitFilterMode(commit.SHA[..10], mode);
-        }
+                    => SetSoloCommitFilterMode(commit.SHA[..10], mode);
+
+
+        public void SetSoloCommitFilterMode(IEnumerable<Models.Commit> commits, Models.FilterMode mode)
+                    => SetSoloCommitFilterMode(commits.Select(x => x.SHA[..10]).ToList(), mode);
 
         public void SetSoloCommitFilterMode(string sha, Models.FilterMode mode)
         {
@@ -1074,6 +1078,16 @@ public void SetSoloCommitFilterMode(string sha, Models.FilterMode mode)
                 RefreshHistoriesFilters(true);
         }
 
+        public void SetSoloCommitFilterMode(IEnumerable<string> shas, Models.FilterMode mode)
+        {
+            bool changed = false;
+            foreach (var sha in shas)
+                changed |= _settings.UpdateHistoriesFilter(sha, Models.FilterType.SoloCommits, mode);
+
+            if (changed)
+                RefreshHistoriesFilters(true);
+        }
+
         public void SetBranchFilterMode(Models.Branch branch, Models.FilterMode mode, bool clearExists, bool refresh)
         {
             var node = FindBranchNode(branch.IsLocal ? _localBranchTrees : _remoteBranchTrees, branch.FullName);

src/Views/RepositoryToolbar.axaml.cs

@@ -467,7 +467,7 @@ private void SoloModeOnCurrentHead(object sender, RoutedEventArgs e)
         {
             if (DataContext is ViewModels.Repository { CurrentBranch: not null } repo)
             {
-                repo.SetSoloCommitFilterMode(repo.CurrentBranch.Head[..10], Models.FilterMode.Included);
+                repo.SetSoloCommitFilterMode(["HEAD", repo.CurrentBranch.Head[..10]], Models.FilterMode.Included);
                 e.Handled = true;
             }
         }