feat(i18n): extract Chinese translations into dedicated JSON file

[cy2311]

Summary

Extract Simplified Chinese translations from the hard-coded localization.rs (5385 lines) into a dedicated locales/zh-Hans.json file. This is Step 1 of the i18n refactoring proposed in issue #3537.

Changes

• locales/zh-Hans.json (new) — 408 Chinese translation entries in standard JSON format
• localization.rs — Reduced by 541 lines. The chinese_simplified() function now reads from zh-Hans.json at runtime

Next steps

• Step 2: Extract remaining languages (ja, pt-BR, es-419, vi, zh-Hant)
• Step 3: Consider adopting a formal i18n library (fluent-rs, rust-i18n)
• Step 4: Add CI checks for missing translations

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[github-actions]

Thanks @cy2311 for taking the time to contribute.

This repository is observing a maintainer-managed PR intake gate in dry-run mode, so this pull request is staying open. This note helps maintainers prepare the allowlist before any enforcement is considered.

Please read CONTRIBUTING.md for the expected contribution shape. A maintainer can grant recurring PR access by commenting /lgtm on a pull request.

[Hmbown]

Thanks again @cy2311. I harvested this into a current-main replacement PR so we can keep your dedicated zh-Hans.json direction without losing the newer localization coverage that landed after your branch diverged.

Replacement: #3559

What changed in the harvest:

• preserves the crates/tui/locales/zh-Hans.json extraction, regenerated to cover all current shipped MessageIds
• keeps your details-shortcut cleanup direction and finishes it so visible help/footer/context copy points to bare v rather than the old modified shortcut
• keeps credit in the merge commit with Harvested from PR #3549 by @cy2311 and a co-author trailer

Verification on the harvest branch:

• cargo fmt --all
• cargo test -p codewhale-tui --bin codewhale-tui --locked localization::tests
• cargo test -p codewhale-tui --bin codewhale-tui --locked tool_details_help_documents_bare_v_without_alt_v
• cargo test -p codewhale-tui --bin codewhale-tui --locked activity_footer_hint
• cargo test -p codewhale-tui --bin codewhale-tui --locked activity_detail
• cargo test -p codewhale-tui --bin codewhale-tui --locked open_tool_details_pager

I will resolve this original conflicted PR after #3559 lands so the public queue points at the clean, credited path.