feat(completion): right-align custom category annotations

marginalia-align has been right for months, but annotations from the custom completion categories (radio stations, music files, and everything built through the system-lib table helpers) never went through marginalia. They rendered unaligned. A registration helper adds a builtin registry entry per category at table construction, which routes the table's own annotation function through marginalia's aligned field. The radio table converts from an affixation function with hand-rolled padding to a plain annotation, since marginalia now owns the alignment. Self-maintaining: any future custom category built through the helpers registers itself.

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