Fix docs locale switcher serving Korean content on English selection

[scarf005]

Bug

On https://opencode.ai/docs/rules/, the page renders Korean content even when English is selected from the footer language selector.

Steps to reproduce

1. Open https://opencode.ai/docs/rules/
2. Confirm the page content is Korean
3. In the footer language selector, choose English
4. Observe redirect to https://opencode.ai/docs/rules/

Actual

The URL remains /docs/rules/ and content is still Korean.

Expected

Selecting English should render the English docs page/content for rules.

Notes

Likely locale resolution/path handling issue when switching from a localized route back to the canonical docs path.

[github-actions]

This issue might be a duplicate of existing issues. Please check:

• Docs Language is not changing from the default #13744: Docs Language is not changing from the default (French to English on /docs/providers/)
• fix(console): follow-up to #13108 — /docs/en still 404 and English locale does not persist #13606: More comprehensive report mentioning this affects all non-English locales, not just Korean

#13606 appears to be the main tracking issue for this locale switching bug and notes it's a follow-up to the broader #13108.

[scarf005]

Closing as duplicate of #13606 (primary tracking issue) and #13744 (same docs language-switch persistence behavior).