fix: 修复配置页面返回时悬空 Qt 对象访问

[LevelDownRefine]

fix #65

Summary by CodeRabbit

• Bug 修复
  • 改善设置卡片组对已失效或已销毁控件的处理，避免更新分隔线时发生异常。
  • 优化分隔线显示状态更新，提升设置界面的稳定性。

[coderabbitai]

Walkthrough

ExpandSettingCardGroup 在更新分隔线时新增 Qt 对象有效性检查，避免访问已销毁的自身或设置卡片，并保留原有的分隔线显示与视图尺寸刷新逻辑。

Changes

Qt 对象有效性保护

Layer / File(s)	Summary
分隔线更新有效性防护 src/one_dragon_qt/widgets/setting_card/expand_setting_card_group.py	引入 shiboken6.isValid，在 _update_separators 中跳过无效对象，避免访问已销毁卡片的可见性状态。

Estimated code review effort: 2 (Simple) | ~5 minutes

Suggested reviewers: shadowlemoon

Poem

我是小兔蹦蹦跳，
失效卡片不再瞧。
分隔线儿稳稳亮，
销毁对象绕开跑。
Qt 安全真美妙！

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Linked Issues check	✅ Passed	修改通过检查 QObject 有效性并跳过失效卡片，符合 #65 关于悬空 Qt 对象访问的修复目标。
Out of Scope Changes check	✅ Passed	变更仅集中在目标方法的防御性修复，没有明显引入与 #65 无关的改动。
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	标题准确概括了本次修改的核心：修复配置页面返回时的悬空 Qt 对象访问问题。

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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[coderabbitai]

Actionable comments posted: 1

🤖 Prompt for all review comments with AI agents

Verify each finding against current code. Fix only still-valid issues, skip the
rest with a brief reason, keep changes minimal, and validate.

Inline comments:
In `@src/one_dragon_qt/widgets/setting_card/expand_setting_card_group.py`:
- Around line 79-81: 在遍历 _card_sep_pairs 的逻辑中，更新无效卡片的处理：在 continue 前检查关联的 sep
是否仍有效，并将其隐藏；保持有效卡片的现有处理流程不变。

🪄 Autofix (Beta)

Fix all unresolved CodeRabbit comments on this PR:

• Push a commit to this branch (recommended)
• Create a new PR with the fixes

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: 42fe79c4-39d2-4255-acc1-3d5a9d0f030d

📥 Commits

Reviewing files that changed from the base of the PR and between 7d2bebe and 892bd88.

📒 Files selected for processing (1)

• src/one_dragon_qt/widgets/setting_card/expand_setting_card_group.py