fix(settings): refresh language row labels on live locale switch

[luoxuanzao]

Summary

• Fixes the stale language row on live locale switch (Obsidian 1.13+ declarative settings): Obsidian's declarative reconciler re-renders every settings row except the one whose control triggered the change, so after switching the display language the language row kept the previous locale's name/description until the settings tab was reopened.
• After setControlValue('locale') persists and calls update(), the tab now also patches the language row's leaf text nodes directly with the new locale's strings. Any later full render produces the same strings, so this cannot conflict with the reconciler.
• Legacy (<1.13) path unchanged; it already re-rendered via renderLegacySettings().
• Adds querySelectorAll to the mocked PluginSettingTab.containerEl and a CHANGELOG entry; ignores the .verify-shots/ scratch dir.

Verification

• npm run typecheck
• npm run lint
• npm run test (3411 tests)
• npm run build
• npm run release:check
• Real-device E2E in test vault: zh-CN → English → zh-CN, the language row's own label/description refresh immediately on both switches (screenshots verified), no layout regression

Safety

• No credentials, private vault content, internal URLs, or personal paths are included
• User-visible change documented in CHANGELOG.md