feat(theme): bundle Pretendard Korean fallback

[aeei]

Summary

• bundle official Pretendard v1.3.9 WOFF2 and use it as the Korean fallback after Geist
• copy package legal notices into every consumer build
• include Pretendard OFL/provenance and release the package source as 0.1.8

Validation

• Jest: 221/221
• Playwright: 16/16
• theme build and docs-starter build
• isolated npm pack consumer build
• App, LinkPie, DeskPie typecheck/build
• GitHub Pages combined build
• desktop/mobile × light/dark manual visual review

Visual evidence

• /tmp/manual-font-preview/contact-sheet.jpg
• 12 source screenshots under /tmp/manual-font-preview/

Notes

• no npm publish; Deck consumes the reviewed npm pack archive from its repository
• Pretendard SHA-256: 9599f12fd42fc0bce1cd50b47a0c022e108d7aa64dd0d1bb0ed44f3282d900b4