fix(tests): ensure storage persistence test properly flushes and releases sled lock

The test was flaky due to potential race condition in nextest parallel execution.
Added explicit flush() call and drop() to ensure sled database is properly
flushed and the lock is released before reopening.

Author: echobt

tests/storage_tests.rs

@@ -110,18 +110,23 @@ mod main_storage {
     #[test]
     fn test_storage_persistence() {
         let dir = tempdir().unwrap();
+        let path = dir.path().to_path_buf();
 
         // Create and save
         {
-            let storage = Storage::open(dir.path()).unwrap();
+            let storage = Storage::open(&path).unwrap();
             let sudo = Keypair::generate();
             let state = ChainState::new(sudo.hotkey(), NetworkConfig::default());
             storage.save_state(&state).unwrap();
+            // Explicit flush before dropping to ensure persistence
+            storage.flush().unwrap();
+            // Explicitly drop storage to release sled lock before reopening
+            drop(storage);
         }
 
         // Reopen and verify
         {
-            let storage = Storage::open(dir.path()).unwrap();
+            let storage = Storage::open(&path).unwrap();
             let loaded = storage.load_state().unwrap();
             assert!(loaded.is_some());
         }