Place the view options control on the leading (`.navigation`) edge on
macOS so it is consistently the first/leftmost toolbar button across all
views, instead of sitting on the right next to the search field in
search views and on the left in non-search views.
Each affected view gains a computed `viewOptionsPlacement` (`.navigation`
on macOS, `.primaryAction` elsewhere) so iOS/iPadOS/tvOS keep the
button trailing. Search-style views (Search, InstanceBrowse) declare the
view options item first so it renders left of the search-filters button;
their flexible spacer is kept to right-pin the search field. Channel's
fixed spacer between view options and the channel menu is now iOS-only.
Plain-Form sheets rendered as columns-style content floating inside
oversized fixed frames on macOS. Anchor these panels to their toolbar
buttons as popovers instead, sized to content; iOS/tvOS keep sheets.
- Search and PeerTube explore filters apply live (Cancel never
reverted anything anyway) and dismiss on outside click
- Subscriptions/Manage Channels "Subscriptions Data" opens as a sheet
from the popover's onDisappear via a pending flag, since presenting
while the popover dismisses gets swallowed
- Media browser view options drop navigation chrome on macOS
Drop the iOS-grouped rounded card in MediaBrowserView's section
container for top/bottom dividers on macOS, force .buttonStyle(.plain)
on directory NavigationLinks to avoid default link tinting, and
shrink MediaFileRow's icon frame on macOS. iOS and tvOS unchanged.
Playable files in the media source browser now honor tvOSVideoTapAction
on tvOS and thumbnailTapAction/textAreaTapAction on iOS/macOS, matching
other video lists. When openInfo navigates to VideoInfoView, playback
routes through QueueManager.playFromMediaBrowser so stream and caption
resolution keep working for Samba/WebDAV files.
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.
