jarvisfriends / tui-base / 29138297300

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Home page: snap-widget showcase with the full mouse contract

The landing page grows from a static welcome box into a working demo
of the snap catalogue, and fixes its input-contract violation on the
way (the wheel used to reach the viewport through Update; Update now
drops tea.MouseMsg entirely and View().OnMouse is the only pointer
door, dispatched by uifx.MouseHandlers):

- Live charts: a sparkline + load bar consume ID-routed chart
  messages from a demo random-walk stream. The stream is gated by the
  I-1 lifecycle hooks — OnEnter arms it, OnLeave stops it — so an
  inactive page costs nothing; clicking the charts block pauses and
  resumes it.
- Pill strip: a segmented status pill rendered in the currently
  selected PillShape; clicking it cycles through all six shapes.
- Scrollbar: on terminals too small for the content, a snap scrollbar
  overlays the right edge with click-the-track / drag-the-thumb
  jumping (inline offsetAt copy of snap's pending scrollbar.OffsetAt —
  swap when the next snap tag ships it).

Interactive blocks register uifx.Zones from the same lipgloss layers
the View composes, so hit zones can't drift from the rendered layout;
zone hits translate through the viewport's YOffset when scrolled.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

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