Live TV had no search: finding a channel or a program meant scrolling
the guide row by row, which is close to unusable on TV with a few
hundred IPTV channels, and the global search tab covers neither
channels nor EPG data.
A search action on the Live TV tab bar (shown on every tab, since the
D-pad route through the chips selects each tab it crosses) opens a
sheet that filters channels by name, call sign, and number, and the
next 24 hours of programs by title and series name, from one
fetchSchedule fan-out per open. Selecting a result jumps the guide to
it: the favorites filter is dropped when it would hide the target row,
the time window is re-anchored when the airing is outside the visible
six hours, and D-pad focus lands on the channel cell or program block.
While the sheet is open, companion-remote search queries land in it
instead of the global Search tab (same save/restore idiom as the video
player overrides). Jumps requested while a guide load is in flight are
stashed and replayed when the load commits.
Based on #1526 by @l3gitpanda, rebased over the guide virtualization
and source-group work, with the schedule fan-out moved onto
forEachLiveTvServer and the jump focus routed through the guide's
focus-snapshot publisher so the landed cell actually renders focused.
close#2168
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