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

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

internal/app/repo_mutations_test.go

@@ -17,7 +17,7 @@ import (
 // upstreamCheckout discovers the repository from the upstream remote, as in a clone of a fork.
 func upstreamCheckout(server *httptest.Server) *fakeGit {
 	return &fakeGit{results: map[string]string{
-		"symbolic-ref --short HEAD":       "main",
+		"symbolic-ref --quiet HEAD":       "main",
 		"config --get branch.main.remote": "upstream",
 		"remote get-url upstream":         server.URL + "/alice/project.git",
 	}}
@@ -135,7 +135,7 @@ func TestRepoRenameHintsAtTheRemote(t *testing.T) {
 	defer server.Close()
 	deps, out, diagnostics := repoTTYDeps(t, server.URL)
 	deps.Git = &fakeGit{results: map[string]string{
-		"symbolic-ref --short HEAD":       "main",
+		"symbolic-ref --quiet HEAD":       "main",
 		"config --get branch.main.remote": "origin",
 		"remote get-url origin":           server.URL + "/alice/project.git",
 	}}