Secure storage overwrite fix (#1161)

* secure storage overwrite fix

* add comment

* bump encrypt package, use more explicit iv source

---------

Co-authored-by: fossephate <fosse@book.local>

lib/core/auth_service.dart

@@ -38,6 +38,9 @@ class AuthService with Store {
   Future<void> setPassword(String password) async {
     final key = generateStoreKeyFor(key: SecretStoreKey.pinCodePassword);
     final encodedPassword = encodedPinCode(pin: password);
+    // secure storage has a weird bug on macOS, where overwriting a key doesn't work, unless
+    // we delete what's there first:
+    await secureStorage.delete(key: key);
     await secureStorage.write(key: key, value: encodedPassword);
   }
 
@@ -104,9 +107,8 @@ class AuthService with Store {
         }
         return;
       }
-}
+    }
 
-    
     Navigator.of(context).pushNamed(Routes.auth,
         arguments: (bool isAuthenticatedSuccessfully, AuthPageState auth) async {
       if (!isAuthenticatedSuccessfully) {
@@ -140,8 +142,6 @@ class AuthService with Store {
           }
         }
       }
-      
-      });
-  
+    });
   }
 }