Add Simplified Chinese localization

[FyMatt]

Summary

• Add an initial Simplified Chinese localization layer for common Warp UI strings.
• Enable Simplified Chinese only for Chinese locales or explicit environment overrides; English remains the default for other locales.
• Prefer common Simplified Chinese UI fonts on Windows and add a repository-local Inno Setup Simplified Chinese language file.

Details

The localization layer is wired through shared UI text entry points, including Text, spans/paragraphs, formatted text, menus, buttons, tooltips, action buttons, and editor placeholders.

Simplified Chinese is enabled when:

• WARP_FORCE_ZH_CN=1 is set.
• WARP_LOCALE starts with zh.
• LC_ALL, LC_MESSAGES, or LANG starts with zh.
• On Windows, the user's default locale name starts with zh.

Testing

• cargo fmt --all --check
• cargo check -p warp --bin warp-oss --features gui

cargo check was attempted on Windows and reached dependency build scripts, but the clean checkout currently needs protoc for warp_multi_agent_api:

Could not find `protoc`.

The same localization patch was previously checked and release-built in the source workspace after the local build prerequisites were present.

Issue

Closes #11462

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[oz-for-oss]

@FyMatt

This PR is not linked to an issue that is marked with ready-to-implement.

Issue-state enforcement details:

• Associated same-repo issues checked: none

• Required readiness label: ready-to-implement

To continue, link this PR to a same-repo issue such as Closes #123 in the PR description, and make sure that issue has ready-to-implement.

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[oz-for-oss]

@FyMatt

This PR is not linked to an issue that is marked with ready-to-implement.

Issue-state enforcement details:

• Associated same-repo issues checked: none

• Required readiness label: ready-to-implement

To continue, link this PR to a same-repo issue such as Closes #123 in the PR description, and make sure that issue has ready-to-implement.

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