🎀[Style] Sprint 10.5 Homepage Simplification and Typography Polish

[maruson08]

Summary

• removed the duplicate Ready to use homepage section and its dead locale/style code
• kept the homepage category-first information architecture
• preserved and integrated the reviewed Korean, Japanese, Spanish, German, and French copy corrections
• introduced system-first multilingual typography tokens with scoped Korean and Japanese behavior
• hardened German and French long-copy layouts across headers, cards, controls, tools, Metadata, and Organizer
• normalized multiline controls and headings without external fonts or scaling hacks
• preserved strict CSP, local-only processing, and all existing PDF behavior
• added homepage and i18n layout regression tests

Validation

• node tests/run-all.mjs
• git diff --check main...HEAD
• locale key and placeholder parity
• privacy, CSP, runtime-resource, accessibility, and tool regressions

Browser QA

The bounded browser attempt failed before rendering because the Windows browser helper hit the known sandbox ACL error. No visual QA is claimed; manual multilingual checks remain required before v1.0.0.