fix: typo in zh header

update: synchronize zh version with latest index layout and content

UX: route generic download buttons to edition selector

Extreme cleanup v2.1: renamed modal elements and bumped version to bypass cache

fix: completely remove email input from pre-order modals and cleanup JS

UX improvement: informative modal before Tally redirect (no redundant input)

optimize: direct Tally link to reduce friction

chore: update pricing to 100 RMB (~.9) and emphasize one-time buy

refactor: unify bilingual thank-you page for Tally redirect

feat: deploy pricing experiment with Elegant/省心 versions and Tally integration

ux: add Sequoia installation warnings to landing pages

ux: substantianted install guide with system settings path and updated fallback count to 9

fix: bypass cache for tally counter to ensure real-time updates

ux: add gatekeeper bypass guide to landing pages

feat: add 15-star milestone for AI Coach to landing pages