Fix ahead-of-origin count for branches with no remote tracking branch

Fall back to counting all local commits when the origin comparison
fails, instead of returning null.

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

@@ -1004,9 +1004,18 @@ async function getAheadOfOrigin(cwd: string, currentBranch: string): Promise<num
     );
     const count = Number.parseInt(stdout.trim(), 10);
     return Number.isNaN(count) ? null : count;
+  } catch {
+    try {
+      const { stdout } = await execAsync(
+        `git rev-list --count ${currentBranch}`,
+        { cwd, env: READ_ONLY_GIT_ENV },
+      );
+      const count = Number.parseInt(stdout.trim(), 10);
+      return Number.isNaN(count) ? null : count;
     } catch {
       return null;
     }
+  }
 }
 
 async function getBehindOfOrigin(cwd: string, currentBranch: string): Promise<number | null> {