fix(playlists): the selection band keeps to one row on a tablet, and a tick moves no row

Below xl the band's buttons are glyphs named in their tooltips, and the row it
replaces stays in the same grid cell, invisible, so the first tick leaves the
list where the second tap expects it. The test's row menu asked for the pins
unmocked, and the offline toast could land before the check: mocked.

docs/DESIGN.md

@@ -544,6 +544,8 @@ of a full-width panel and nothing on the right.
   the count (and how many a filter hides), the last move's target as one click, Move to, Remove, Clear
   selection. An action clears the selection, undoes by its toast and, when it fails, ticks its rows again.
   Delete takes the selection when there is one, else the row under the keyboard, with no confirm.
+  Below `xl` the band's buttons are glyphs named in their tooltips, and a filter's hidden count is "+N" with
+  its sentence in the tooltip. The row the band replaces keeps its height, invisible, so a tick moves no row.
 - **Motion:** 150–300ms micro-interactions, transform/opacity only; `prefers-reduced-motion` is respected.
   [WCAG 2.3.3]
 
@@ -845,3 +847,4 @@ of a full-width panel and nothing on the right.
 | 2026-11-01 | Selecting a list's rows (owner D2 a)             | An always visible box first in the row and one over the column for the rows shown; Shift+click a range, `x` the row under the keyboard, Esc clears; the selected row wears `accent/12` with its tick. Rows a filter hides stay selected, an action covers those shown; Watch later offers no selecting.                                                                                             |
 | 2026-11-01 | Selection band (owner D1 a, D3 a, D4 a)          | The toolbar's second row while rows are selected, no floating bar: move (the last target as one click) and remove, no copy; both undo back to the places, a video the target held before stays there; a single row's move undoes too.                                                                                                                                                               |
 | 2026-11-01 | Grip on a phone (owner A)                        | Below a 24rem table a playlist row has no grip: the title keeps its width, and the row menu keeps the moves.                                                                                                                                                                                                                                                                                        |
+| 2026-11-01 | Selection band on a tablet (owner A)             | Below `xl` the band is glyphs on one row, the names in tooltip and aria-label, as on the channel header; the replaced row stays in the same grid cell, invisible, so the first tick moves no row under the second tap.                                                                                                                                                                              |