v0.12.0-beta.1

Second R18 checkpoint. The phone gets the same chrome the desktop got in
alpha.1, onboarding stops asking questions, and the data lanes land. Still a
prerelease: a few lanes (RRFS, the remaining store submissions) come at 0.12.0.

The phone

• The persistent bottom sheet and the five-slot toolbar are gone. The phone
  draws the same floating chrome the desktop does — search pill, control
  column, scrubber — with content in Material modal sheets instead of a
  drawer. Predictive back still works.
• Long-press the map to inspect what is under your finger, double-tap and drag
  to zoom with one hand, swipe sideways between panes.
• Haptics: ticks as the scrubber crosses a frame, a buzz when a warning lands
  on you, a bump when a sheet snaps.
• Tablets and landscape phones get a side rail and a docked drawer instead of
  sheets.
• Widgets show how far the nearest storm is. A battery-saver mode stretches
  the poll cadence and throttles repaints. On a chase, the next radar down the
  road is prefetched before you need it, and a chase can be replayed against
  the archive afterwards.

Getting started

• The setup wizard is gone. First run finds you, picks the nearest radar and
  draws it — about ten seconds, no questions.
• Notification permission is asked for when you turn on something that
  notifies, or when a warning lands near you. Never at install.
• One help hub behind ?: glossary, hotkeys, the tour and what's new, all
  searchable in one place. Labels across the app read in plain language, with
  the abbreviation kept in parentheses for anyone who wants it.
• Text products — area forecast discussions, tropical advisories — render in a
  real webview with real typography, on both desktop and Android.

Weather

• GOES loops run over archive dates alongside the radar timeline, and the
  mid-level water vapor bands are selectable.
• MRMS rotation tracks (30/60/120 minutes) are field layers now, and hail
  swaths accumulate locally over a window you choose.
• Snow squalls and banding get their own emphasis in winter.
• An alert rule can trigger on a lightning jump — the rate of change of flash
  density inside a cell.
• NAM nest and NBM join the model list. Synoptic mesonets join the surface
  obs, with your own API key.
• Cells are ranked by a composite severity score, and tapping one opens the 3D
  volume already centered on it.
• Panes remember their own thresholds and field layers. Events can be saved as
  replay bundles — time range, site, camera — and replayed with archived
  radar, warnings, reports and outlooks in sync.

The web build

• Installable as a PWA, with the app shell cached offline.
• Tiles, volumes and palettes persist between visits.
• File dialogs, GPS and notifications all work in the browser now.
• A share button writes a permalink that carries the site, camera and time.

Elsewhere

• MQTT publishing, a Home Assistant camera loop endpoint and a live dashboard
  at the --serve index.
• An update chip appears when a newer release exists. No self-updating.
• Motion throughout, with reduce_motion and an automatic degrade on slow
  frames. Labels, roles and focus order on all of the new chrome.
• The application id is io.hookecho.HookEcho, and every screenshot in the
  README, the store listings and this repo was reshot on the new chrome.