Audit 1.10 (t4 lines 82-88): the prototype shows a 2x2+ grid of 8
favorite stations; the build was a 260px-wide horizontal strip capped
at 6.
Raises the cap to 8 and replaces the horizontal ListView with a
GridView.builder (2 columns, gap 10). Adds a dedicated _CeldaTusEmisoras
cell (44px square art radius 11, name + genre) rather than reusing
TarjetaEmisora(esCompacta: true), since that widget always renders a
favorite button and a live badge that this prototype cell never draws.
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