fix(player): marks give way to newer lists, Watch later items mark, and auto-advance has its own glyphs

A session's marks are weighed per field against when each page of a never-refetched list was read:
a page read before the mark (a Show more / Load more on its way) takes it, one read after keeps the
server's word. The live search lays them over its rows too, not only the related list.

Items of the built-in Watch later list ARE the bookmark, so adding, removing and moving them go
through features/video/videoWrites and mark the video; the contract test covers those writes and
catches a write that is named without being called on the spot.

The player's watched toggle follows a mark confirmed elsewhere since it opened (the related row's
menu, a notice's Undo); Restart on the related row after a description link goes back to it.
The file viewer tells the help sheet its keys wait under a layer; refusalReason replaces the last
two open-coded reads.

Auto-advance wears list glyphs of its own (the skip arrows are Previous / Next beside it), and the
auto-advance and loop cycles are `lit`, not toggles: no aria-pressed, the name says the mode. Both
places render from one list of controls, so the docked tooltips name the mode too. The English cap
message and admin hint quote "Show more"; the hint says refunds are limited.

docs/DESIGN.md

@@ -225,7 +225,9 @@ Also in force:
   tag chip is `Chip`; a sortable row's grip is `DragHandle`. On the always-dark player chrome both
   `Button` and `IconButton` use the `overlay` variant (white, a white layer), whatever the theme; the Plex
   control row is IconButton's `player` rung (36, a 20px glyph, round, 44 on touch). A pressed toggle is
-  `pressed`: the solid accent on a `Button`, the accent glyph on an `IconButton`. A raw `<button>` (or a bare
+  `pressed`: the solid accent on a `Button`, the accent glyph on an `IconButton`. A mode cycle (the player's
+  auto-advance and loop) is no two-state switch: `lit` gives it the same look when it is not off, without
+  `aria-pressed`, and its name says the mode. A raw `<button>` (or a bare
   `FocusSafeButton`) outside the control primitives (eslint `BUTTON_PRIMITIVES`) is a lint error. A text-less button must have an accessible name, and the type enforces
   it. [WCAG 4.1.2]
 - **The chip family** (`Chip`, E28 S3b): rounded-full, never under 24 (A3 grows it to 44 on touch).
@@ -252,7 +254,10 @@ Also in force:
   [Nielsen #1]
 - **A glyph means one thing.** Play (▷) starts playback, or resumes a paused transfer; a retry is the
   refresh arrow (`RefreshCw`); a reset or revert is the counter-clockwise arrow (`RotateCcw`). A failed
-  download's Retry had worn the Play glyph, which promised a video. [Nielsen #4]
+  download's Retry had worn the Play glyph, which promised a video. The skip arrows (⏮ ⏭) are Previous /
+  Next; the auto-advance mode beside them wears list glyphs (`ListEnd` next, `ListStart` previous,
+  `Shuffle` random; off is `ListEnd`, not lit) — a mode in the skip arrows put two identical ⏭ on the
+  panel's glyph-only row. [Nielsen #4]
 
 ## Surfaces and page chrome — _Decided_ (batch B)
 
@@ -560,7 +565,7 @@ of a full-width panel and nothing on the right.
   "Play from the beginning", and its picture carries the cards' progress bar.
 - **The YouTube modal:** its chrome uses the `Button` rungs (44 on touch); Previous / Next live in the panel
   (its transport row: glyphs only — Previous, the count, Next, auto-advance, loop on one line, each named in
-  its tooltip — or the shut panel's strip) and on Shift+← / →, with no strips beside the card. Close is
+  its tooltip, the modes with their current one — or the shut panel's strip) and on Shift+← / →, with no strips beside the card. Close is
   an icon at the top right of the panel (wide: its head, or its strip) and at the end of the title row
   under the video (stacked). Wide, the panel shows the description outright, clamped to three
   lines with a More (`ClampedText`; a Tab onto a link below the cut opens it), and collapses to a 2.75rem
@@ -814,3 +819,4 @@ of a full-width panel and nothing on the right.
 | 2026-10-24 | Related videos (owner U1–U3 ★, D1 A, D3)         | On demand: a tab beside the description (wide), a drawer (stacked); the narrow thumbnailed row, its menu alone, a followed check; plays in place and the list stays the opened video's; an on-topic / Hungarian-trending switch kept on the account                                                                                                                                                 | Always shown; the end-of-video grid alone; a dialog; a big card or a text row; a list that follows the playing video                                                                                   | The modal is full on a small screen; a picture is what a choice among strangers rests on; a list that stays put is tried one by one, and spends no more of the day's cap                                                     |
 | 2026-10-25 | Related: one played; off (owner D1 a, D2 a)      | Played from the list, it is the player's item: its title, controls and progress, marked watched at its end, the queue left where it was; a daily limit of 0 takes the tab and the button away                                                                                                                                                                                                       | A linked video's in-place play (no controls, nothing kept); a tab that only shows a refusal                                                                                                            | What is watched should count as watched, wherever it was started from; a control that can only be refused is not offered                                                                                                     |
 | 2026-10-25 | Player panel glyphs (owner 1A, 2A, 3)            | In the side panel the queue row is glyph-only on one line, and Mark watched is a glyph toggle among the actions (✓ / ✓✓); the docked bar keeps its labels; the related switch at the default size, "Trending"                                                                                                                                                                                       | Labelled buttons wrapping onto three lines; glyphs on the docked bar too; Mark watched on its own line                                                                                                 | The panel is narrow and the list controls are the same few every time; each glyph keeps its full name and shortcut in its tooltip; the docked bar has the width for words                                                    |
+| 2026-10-25 | Auto-advance glyphs (owner E A, H a)             | Auto-advance wears list glyphs (`ListEnd` next and off, `ListStart` previous, `Shuffle` random), in the panel and the docked bar; the auto-advance and loop cycles are `lit`, not `pressed`                                                                                                                                                                                                         | The skip arrows for the mode; an X'd list for off; `aria-pressed` on a cycle                                                                                                                           | Beside Previous / Next the skip arrows read as a second Next; a cycle of three or four modes is no two-state switch, and its name already says which                                                                         |