On tvOS, ContentUnavailableView inside a Group doesn't expand to fill
available space — it sizes to content and aligns top-leading. Add
.frame(maxWidth: .infinity, maxHeight: .infinity) to all instances
so they center correctly in their parent containers.
Post watchHistoryDidChange notification when a new watch entry is inserted
during local playback progress updates (but not on every progress tick).
Reload Home data when switching back to the Home tab and when the Customize
Home sheet is dismissed.
Remove 32 non-dotted keys (16 unused format specifiers, 16 word keys)
and replace with properly namespaced dotted keys following the existing
convention (common.*, player.*, search.*).
