fix: handle repos with no commits in getCurrentBranch

git rev-parse --abbrev-ref HEAD fails with exit code 128 on freshly
initialized repos with no commits. This error bubbled up through
workspace listing and showed a toast error on every app launch for
users with empty git repos.

packages/server/src/utils/checkout-git.test.ts

@@ -18,6 +18,7 @@ import {
   __setGhPathForTests,
   __setPullRequestStatusCacheTtlForTests,
   commitAll,
+  getCurrentBranch,
   getCheckoutDiff,
   getCheckoutShortstat,
   getPullRequestStatus,
@@ -84,6 +85,15 @@ describe("checkout git utilities", () => {
     );
   });
 
+  it("returns null for getCurrentBranch in a repo with no commits", async () => {
+    const emptyRepo = join(tempDir, "empty-repo");
+    execSync(`mkdir -p ${emptyRepo}`);
+    execSync("git init -b main", { cwd: emptyRepo });
+
+    const branch = await getCurrentBranch(emptyRepo);
+    expect(branch).toBeNull();
+  });
+
   it("handles status/diff/commit in a normal repo", async () => {
     writeFileSync(join(repoDir, "file.txt"), "updated\n");
 

packages/server/src/utils/checkout-git.ts

@@ -525,12 +525,16 @@ async function requireGitRepo(cwd: string): Promise<void> {
 }
 
 export async function getCurrentBranch(cwd: string): Promise<string | null> {
-  const { stdout } = await runGitCommand(["rev-parse", "--abbrev-ref", "HEAD"], {
-    cwd,
-    env: READ_ONLY_GIT_ENV,
-  });
-  const branch = stdout.trim();
-  return branch.length > 0 ? branch : null;
+  try {
+    const { stdout } = await runGitCommand(["rev-parse", "--abbrev-ref", "HEAD"], {
+      cwd,
+      env: READ_ONLY_GIT_ENV,
+    });
+    const branch = stdout.trim();
+    return branch.length > 0 ? branch : null;
+  } catch {
+    return null;
+  }
 }
 
 async function getWorktreeRoot(cwd: string): Promise<string | null> {