The shell component now owns rows, focus and the viewport only: the day,
zoom, density, filters, clock and day geometry move to EpgGuideViewState,
and every programme-dialog entry point to EpgGuideDialogController.
Keyboard navigation is reachable by assistive technology: exactly one grid
cell carries tabindex="0" (the focused cell, else the playing row's channel
cell, else the first row's), the guide moves DOM focus with it after each
handled key, a click hands the roving index to the clicked cell, and the
viewport, rows and cells expose grid/row/gridcell roles.
Search results were formatting raw provider instants, so they ignored the
EPG display offset; they go through getProgramTimeMs like every other time
the guide renders.
Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
