[Enhancement] 账户列表优化

[ToobLac]

• 搜索
• 拖拽改变顺序（搜索时禁用）

Closes #5999 Resolves #5615 Resolves #3046

[Glavo]

/gemini review

[gemini-code-assist]

Code Review

This pull request introduces search functionality and drag-and-drop reordering for the account list page. The review feedback highlights several critical improvements: wrapping the reordering list operations in a try-finally block to guarantee that the selection check flag is safely reset, preventing a potential NullPointerException by checking for null search queries before converting to lowercase, and avoiding an IndexOutOfBoundsException by validating the index when toggling an account's portable status.

[Glavo]

本 PR 可以把全局账户拖到便携账户中间，但实际这两类账户被存储在不同的文件里，这种次序不会被持久化，下次启动 HMCL 后次序会丢失。

[ToobLac]

本 PR 可以把全局账户拖到便携账户中间，但实际这两类账户被存储在不同的文件里，这种次序不会被持久化，下次启动 HMCL 后次序会丢失。

Solved

[Glavo]

/gemini review

[gemini-code-assist]

Code Review

This pull request implements account searching and drag-and-drop reordering in the account list page. The review feedback highlights several critical and high-severity issues, including a potential IndexOutOfBoundsException when loading accounts with out-of-bounds indices, loss of selection state when moving accounts, potential NullPointerExceptions during search filtering, list corruption if drag-and-drop is performed while searching, and potential layout calculation inaccuracies during drag-and-drop target indexing.

[gemini-code-assist]

在搜索过滤时，account.getCharacter()、account.getUsername() 和 account.getUUID() 可能会返回 null，直接调用它们的方法会引发 NullPointerException。建议在调用方法前进行非空校验，以提高代码的防御性。

                        String character = account.getCharacter();
                        String username = account.getUsername();
                        java.util.UUID uuid = account.getUUID();
                        return (character != null && character.toLowerCase(Locale.ROOT).contains(text))
                                || (username != null && username.toLowerCase(Locale.ROOT).contains(text))
                                || (uuid != null && uuid.toString().contains(text))
                                || type.contains(text);

[gemini-code-assist]

在搜索状态下，虽然拖拽的起点被禁用了，但 setOnDragOver 和 setOnDragDropped 仍然可能接收到拖拽事件。如果此时发生拖拽释放，计算出的目标索引会基于过滤后的列表，从而导致原始列表的顺序错乱。建议在 setOnDragOver 中增加 !skinnable.isSearching().get() 校验，完全禁用搜索时的拖拽接收。

Suggested change

	list.setOnDragOver((event) -> {
	if (event.getGestureSource() != list && event.getDragboard().hasString()) {
	event.acceptTransferModes(TransferMode.MOVE);
	}
	event.consume();
	list.setOnDragOver((event) -> {
	if (!skinnable.isSearching().get() && event.getGestureSource() != list && event.getDragboard().hasString()) {
	event.acceptTransferModes(TransferMode.MOVE);
	}
	event.consume();
	});

[gemini-code-assist]

在拖拽释放事件中，多次调用 Accounts.getAccounts() 会带来不必要的开销。此外，使用 accountId.equals(...) 相比 getIdentifier().equals(accountId) 更加安全，能有效避免潜在的 NullPointerException。建议将账户列表存入局部变量，并优化比对逻辑。

Suggested change

	for (int i = 0; i < Accounts.getAccounts().size(); i++) {
	if (Accounts.getAccounts().get(i).getIdentifier().equals(accountId)) {
	draggedAccount = Accounts.getAccounts().get(i);
	sourceIndex = i;
	break;
	}
	}
	javafx.collections.ObservableList<Account> allAccounts = Accounts.getAccounts();
	for (int i = 0; i < allAccounts.size(); i++) {
	Account acc = allAccounts.get(i);
	if (acc != null && accountId.equals(acc.getIdentifier())) {
	draggedAccount = acc;
	sourceIndex = i;
	break;
	}
	}

[gemini-code-assist]

在计算目标索引时，混合使用 child.getLayoutY() 和 child.getBoundsInParent().getHeight() 可能会在存在缩放或平移变换时导致计算不准确。建议统一使用 child.getBoundsInParent() 来获取子组件在父容器中的 Y 坐标和高度，以保证计算的准确性和一致性。

        private int getTargetIndex(VBox list, double y) {
            int index = 0;
            for (int i = 0; i < list.getChildren().size(); i++) {
                javafx.scene.Node child = list.getChildren().get(i);
                javafx.geometry.Bounds bounds = child.getBoundsInParent();
                if (bounds.getMinY() + bounds.getHeight() / 2 > y) {
                    return i;
                }
                index = i + 1;
            }
            return index;
        }