feat(history-ui): add resizable commit history aside

The commit history panel is now resizable with a draggable handle and
keyboard support. The chosen width is persisted in local storage so the
layout stays consistent across sessions. Git commit loading was also
adjusted to include all branch tips for a more complete graph.

- Add width persistence and pointer/keyboard resizing for history panel
- Update commit graph query to use topo-order across all refs
- Extend tests to ensure branch tips are included in commit results

src-tauri/src/git.rs

@@ -996,6 +996,8 @@ fn commits_for_repo(repo: &Path, limit: Option<u32>) -> Result<Vec<GitCommit>, S
         repo,
         [
             "log",
+            "--all",
+            "--topo-order",
             "--decorate=short",
             "--name-status",
             "-M",
@@ -3869,6 +3871,33 @@ mod tests {
         assert!(comparison.patch.contains("+original"));
     }
 
+    #[test]
+    fn commits_for_repo_includes_all_branch_tips_for_graph() {
+        let repo = init_temp_repo("commits_all_branches");
+        commit_initial_file(&repo.path);
+        let base_branch = git_output_test(&repo.path, ["rev-parse", "--abbrev-ref", "HEAD"]);
+
+        run_git_test(&repo.path, ["checkout", "-q", "-b", "feature/graph"]);
+        fs::write(repo.path.join("feature.txt"), "feature\n")
+            .expect("feature file should be written");
+        run_git_test(&repo.path, ["add", "feature.txt"]);
+        run_git_test(&repo.path, ["commit", "-q", "-m", "feature graph"]);
+        let feature_commit = git_output_test(&repo.path, ["rev-parse", "HEAD"]);
+
+        run_git_test(&repo.path, ["checkout", "-q", base_branch.as_str()]);
+        fs::write(repo.path.join("main.txt"), "main\n").expect("main file should be written");
+        run_git_test(&repo.path, ["add", "main.txt"]);
+        run_git_test(&repo.path, ["commit", "-q", "-m", "main graph"]);
+        let main_commit = git_output_test(&repo.path, ["rev-parse", "HEAD"]);
+
+        let commits = commits_for_repo(&repo.path, Some(10)).expect("commits should load");
+
+        assert!(commits.iter().any(|commit| commit.hash == main_commit));
+        assert!(commits.iter().any(|commit| {
+            commit.hash == feature_commit && commit.refs.iter().any(|r| r.contains("feature/graph"))
+        }));
+    }
+
     #[test]
     #[cfg_attr(
         windows,