fix(filters): the year dialog fits a tablet, walks by arrow keys, names one year once

- a decade cell is a 36-high box with its count under the year (owner A)
- arrow keys walk the cells: along a decade, then to the nearest year below
- clearing the kept older year hands the focus on instead of dropping it
- More... shows while a year with titles is hidden, as a plain chip
- the decade caption is not read twice; the Plex range fields have names
- one Plex year is labelled 1999, not 1999-1999, via oneYear/singleYear
- tests for the Plex wiring and the feed year clearing the upload date

docs/DESIGN.md

@@ -232,6 +232,8 @@ Also in force:
   `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).
+  One exception, the `cell` size: a cell of a grid of choices (the year dialog's decades) is a 36-high
+  rounded box with its count under the label, so ten fit across a dialog at a tablet's width.
   `filter` is a selectable option, solid accent when `pressed`; the "+N" and "More…" triggers are filter
   chips too, and while their popover is open they show it as an open trigger does, the accent edge and
   text (not the solid fill, which would say "selected"); `token` is an applied narrowing, the accent tint, the whole chip removing
@@ -894,3 +896,5 @@ of a full-width panel and nothing on the right.
 | 2026-11-11 | A GIF from the clip panel (owner D1 A)                                  | A Format · Video / GIF toggle above the name row; GIF shows the size (long side 320 / 480 / 640), the expected size, a note over 15 MB or 30 MB, and over 30 s the reason with Make GIF unavailable; a GIF is never made from the download dialog                                                                                                                                                   | A GIF format in the download dialog with its own range picker; the size as a free number                                                                                                               | The range is already marked in the panel; a size people can judge beats pixels to type, and a chat's link preview stops moving over 15 MB                                                                                    |
 | 2026-11-11 | A GIF from the Downloads editor (owner D2 A)                            | Its own Format row (a video only); with GIF each kept segment is its own GIF, Join unavailable with its reason, one line in place of precise / fast, a note per segment over a limit                                                                                                                                                                                                                | One GIF of the joined segments; GIF as an output mode beside Separate / Join                                                                                                                           | A GIF longer than 30 s is refused anyway, and a joined GIF hides which segment is over the limit                                                                                                                             |
 | 2026-11-11 | A shared GIF shows itself (owner D3)                                    | The share page shows the picture itself, no player; Download beside it, and a tip that the downloaded file moves in any chat; its failure is said only once its retry failed too                                                                                                                                                                                                                    | The watch player; a file row that only downloads                                                                                                                                                       | A GIF plays and repeats on its own and nobody pauses one; a chat's link preview is the chat's to draw, the dragged-in file moves everywhere                                                                                  |
+| 2026-11-14 | One year filter for the feed and Plex (owner ★)                         | `ui/YearPicker`: the six newest years as chips (the selected one kept beside them), "More…" opens every year laid out by decade, no paging, sortable by count; Plex keeps its range fields under it, a year is a range of one                                                                                                                                                                       | The feed's scrolling popover; Plex's range fields alone                                                                                                                                                | A library spanning ninety years fits on one screen by decade, and both rails pick a year the same way                                                                                                                        |
+| 2026-11-14 | The year dialog's cell (owner ★A)                                       | The count under the year in a 36-high rounded box, compact ("17.2K"), one row per decade at every width                                                                                                                                                                                                                                                                                             | The year-and-count pill, five columns and two rows per decade on a narrow screen                                                                                                                       | The pill spilled out of its cell at a tablet's width (measured 74 px in 62); a decade on one row still reads at a glance                                                                                                     |