- New OnboardingView module (public/js/views/onboarding.js):
• Reads /onboarding/slides.json (designer schema with inline SVG icons,
per-slide cta_primary/cta_skip labels) — falls back to 3 emoji slides
if the JSON is unavailable.
• Renders a Telegram-style dark overlay inside #mobile-frame with a
220px floating SVG icon, title, body, dot indicator (expandable
active dot), primary CTA, and a ghost Skip button.
• Prev/Next via primary CTA; dot click jumps to slide; arrow keys and
horizontal swipe also navigate.
• Haptic feedback via TG_APP on slide change + finish.
• markDone() writes buhapp.onboarded='1' to localStorage so the flow
never repeats. isDone()/reset() exposed for QA.
- App integration (public/js/app.js):
• New App.maybeOnboard() helper — awaited after every successful auth
path: Telegram login, restored session, email login, email register,
and consent accept. Skips silently if already onboarded.
- UI assets (public/onboarding/):
• slides.json with 3 designer slides (Map / Chat / Review).
• Inline-SVG icons for map, chat, and review (icon-*.svg kept for
designer reference, preview.html too).
- Styles (public/css/app.css): new .onboarding-* dark-theme rules.
- Index (public/index.html): loads onboarding.js before app.js.
