GET /api/library/browse without mediaType now spans all 10 media kinds (was 4: Movie/TelevisionShow/TelevisionSeason/Artist), which flooded two pickers with episodes/songs/etc. mixed in with the intended top-level items. Fan both consumers out per-kind and merge, restoring pre-#168 scoping without touching the API: - ChannelBuilder's library browse tab now fans out Movie/TelevisionShow/ TelevisionSeason/Artist per page (mirrors the existing loadCollections pattern) and sums per-kind totalCount so paging/load-more still works. - CollectionsScreen's add-items search now fans out over the same 4 addable kinds instead of filtering one unscoped page client-side. Extended App.test.tsx and CollectionsScreen.test.tsx to assert the per-kind requests and updated a few fixtures that relied on the old unscoped browse call returning collection-kind items under the library tab.