fix: preserve Chinese locale scripts

[2sem]

Summary

• Fix locale mapping so Chinese script variants are preserved instead of collapsing to plain zh during translation support checks.
• Restore Korean → Chinese and Korean → Traditional Chinese support by routing locale matching through TranslationLocale.from(locale:).

Test Status

• Environment review confirmed the root cause and patch path.
• Full mise x -- tuist ... verification is blocked here by missing tuist auth login.

Flow

flowchart TD
    A[User selects Korean source] --> B[User selects Chinese target]
    B --> C[Locale mapping keeps Hans/Hant script]
    C --> D[Supported pair resolves correctly]
    D --> E[Translation can proceed]

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[tuist]

🛠️ Tuist Run Report 🛠️

Tests 🧪

Scheme	Status	Cache hit rate	Tests	Skipped	Ran	Commit
talktrans-Workspace	✅	0 %	1	0	1	207c0c790

Builds 🔨

Scheme	Status	Duration	Commit
talktrans-Workspace	✅	1m 36s	207c0c790