feat(apple): add dismissable widget promo banner on home and topic pages
feat(a11y): add support for Larger Text, Color Independence, and High Contrast
feat(apple): comprehensive accessibility improvements
test(apple): modernize and speed up test suite
chore: normalize trailing whitespace in tracked files
chore(backend): consolidate dedup model to gemini-2.5-flash-lite
refactor(apple): remove unused code and Reset button
refactor(apple): simplify UI, add widget promo to macOS sidebar