fix: support macOS 13 and add English/Korean localization

[122yjs]

Summary

This PR contains the completed local compatibility and localization work:

• Fix the release build so the Mach-O deployment target matches LSMinimumSystemVersion=13.0.
• Make English the development and fallback language.
• Add Korean localization for the SwiftUI window, menu-bar menu, alerts, notifications, help, and permission text.
• Copy localization resources without inherited quarantine/provenance attributes.
• Add regression checks for localization key parity, format placeholders, resource inclusion, code signing, and Mach-O minos.
• Remove the Sequoia-failing iconutil build step and use the standard macOS app icon.

Language behavior

• English is the default and fallback.
• Korean is selected when Korean is preferred in macOS.
• Unsupported languages fall back to English.

Verification

Tested on macOS 15.7.7 Sequoia (24G720), Apple Silicon, Swift 6.1.2, and macOS SDK 15.5.

./check.sh
Localization checks passed: English default, Korean available
Checks passed: macOS deployment target 13.0

Additional verification:

• English lookup: Never Sleep, Settings
• Korean lookup: 잠자기 방지, 설정
• Unsupported language lookup falls back to English
• Swift compilation and type checking pass
• .strings and plist validation pass
• English/Korean localization key sets match
• %@ and %d format placeholders match
• App code-signature verification passes
• Built executable reports minos 13.0

Closes #2

Note: The same commit is also present in the earlier Draft PR #3. This PR is opened from the dedicated feat/english-korean-localization branch so the localization work has its own reviewable branch.