lib/useDismiss.ts replaces the identical mousedown-outside + Escape effect that
DataTable (filter popover), Channels (tag picker) and AddToPlaylist each hand-rolled.
Positioning stays with each caller (it genuinely varies); AddToPlaylist keeps its
own resize/scroll reposition effect.
A focus-channel deep-link sets (and persists) the channel-name column filter
via the DataTable's externalFilter. That persisted value then survived into
unrelated visits: clicking the header's "N without full history" link landed
on the right tab with the right status chip, but a leftover name filter (e.g.
a channel focused in a past session) hid every row — "No channels".
Add a resetFiltersToken to DataTable that clears its column filters when it
advances, and bump it from the header intent. The token's ref starts at 0 so
the clear fires even when the table remounts on navigation, while a plain
reload (token still 0) keeps the user's persisted filters.
- Channel-row tags show only what's attached; a '+' opens a per-channel picker. Clicking a tag
filters the feed by it; a 'Your tags' sidebar widget makes that filter visible/clearable.
- Tag manager dialog (add/rename/delete; delete only confirms when the tag is in use), reachable
from the Channel manager and the feed sidebar; hovering a tag's count lists its channels, each a
link that focuses it in the Channel manager (DataTable gains an external filter input).
- Video cards get a reset action that clears all watch state (incl. an in-progress position).
- api.req() now raises the error dialog on 5xx and 400/409/422 with the server's reason.
Columns auto-size to their content (table-layout: auto) via a per-column 'nowrap' flag;
headers never wrap. Replaces hand-tuned fixed widths so values like 'N / S / L' no longer
wrap, and callers give a min-width only where a column must not collapse.
Generic client-side table: per-column sort, in-header filters (text/select/multi),
built-in pagination with a user-set page size (incl. All) and an editable jump-to-page
box. Sort/filter/page/size persist to localStorage (survive F5). Falls back to a compact
card list below md. Intended for reuse across modules (channels now, playlists next).