fix: address verified review findings (branches-checkout-status-1)

Signed-off-by: bircni <bircni@icloud.com>

internal/app/api_test.go

@@ -85,7 +85,7 @@ func TestAPIBranchPlaceholderUsesEscapedCurrentBranch(t *testing.T) {
 	}))
 	defer server.Close()
 	deps, _, _ := serverDeps(t, server.URL)
-	deps.Git = &fakeGit{results: map[string]string{"symbolic-ref --short HEAD": "feature/x"}}
+	deps.Git = &fakeGit{results: map[string]string{"symbolic-ref --quiet HEAD": "feature/x"}}
 	require.NoError(t, Execute(context.Background(), deps, []string{"api", "repos/{owner}/{repo}/branches/{branch}", "-R", "alice/project"}))
 	require.Equal(t, 1, calls)
 	deps.Git = &fakeGit{}