fix: clear reflog debounce timer on GitBaselineWatcher dispose (#71 item 6)

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

src/gitBaseline.ts

@@ -119,7 +119,12 @@ export class GitBaselineAdapter implements vscode.Disposable {
         if (pending) clearTimeout(pending);
         pending = setTimeout(() => void repo.status().catch(() => {}), 150);
       });
-      this.disposables.push({ dispose: () => watcher.close() });
+      this.disposables.push({
+        dispose: () => {
+          watcher.close();
+          if (pending) clearTimeout(pending);
+        },
+      });
     } catch {
       // best-effort only — the passive repo.state.onDidChange listener still applies.
     }