Mini App V4 phase 0. The (tg) shell gains the groundwork every later
phase builds on:
- Dev mock bridge: outside Telegram, a development build falls back to a
no-op WebApp object and skips the webapp-auth POST (the regular panel
session cookie authorizes API calls), so the cockpit is workable in a
plain browser. Production keeps the "Open from Telegram" wall.
- Telegram theme adoption: themeParams map onto the shadcn CSS variables
scoped to #tg-shell (desktop dashboard untouched), colorScheme drives
the dark class, themeChanged re-applies live. Non-hex values are
dropped at the trust boundary.
- Viewport/swipe correctness: shell height rides Telegram's own
--tg-viewport-stable-height (100dvh fallback), vertical swipe-to-close
disabled so list scrolling can't dismiss the app.
- Native chrome bindings: TgWebAppProvider context plus useMainButton /
useBackButton declarative hooks and a null-safe haptics helper —
consumers never touch window.Telegram directly.
