On phones the movie/show hero hugged the left edge under a full-bleed
backdrop while the new collection page stacks its poster, title and
actions on the centre line, so the two pages read differently.
At widths under the mobile breakpoint the hero now centres the clear
logo (or title fallback), both chip rows and the action row; the hero
height, chip shedding, focus order and back button are unchanged. Wide
heroes keep the bottom-left column — a 400px logo centred in a
tablet-wide hero floats, and the wide collection header is left-aligned
too. TV is untouched.
_buildDetailLogoOrTitle gains an alignment and _buildDetailTitle a
textAlign, both defaulting to the previous values.
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