Landing redesign + Telegram bot UX

What's new

Landing

• Full redesign of /ru and /en. 10 sections: Hero, HowItWorks (3 steps), SocialProof, Features, UseCases, WhyUs, PricingTeaser, FAQ, FinalCTA, Footer.
• New positioning: "Voice-first AI assistant for your whole life" (instead of generic "productivity tool").
• Tone unified to informal across all landing strings.

Telegram bot

• "My Data" now covers all 9 orbits: tasks, notes, journal, habits, events, goals, finance, health, bookmarks.
• Rich "My Day": time-aware greeting + events + top tasks + habits + recent health + today's spending.
• Quick-log shortcuts under "My Day": 💧 +Glass of water (instant), 🔄 Refresh.
• /help rewritten with workflow examples (voice/photo/forward/url/commands).
• New /language command — switch interface between RU/EN.

Language sync

• users.language is now the single source of truth: web, JWT, Telegram bot.
• Login redirect uses stored locale (was Accept-Language header).
• Profile change → DB + session update + URL navigation in one call.

Fixed

• HowItWorks grid overlap (grid-template-areas missing for desktop).
• Header transparent overlay — text from sections was bleeding through. Replaced with solid color.
• Features bento layout (5 cards on a 4×2 grid → empty cells, uneven heights). Replaced with equal auto-fit grid.
• Pricing page for anonymous visitors now uses marketing shell (Header+Footer), not app sidebar.