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

frontend/src/modules/plex/PlexInfo.tsx

@@ -3,7 +3,7 @@ import { qk } from "../../lib/queryKeys";
 import { useTranslation } from "react-i18next";
 import { useQueryClient } from "@tanstack/react-query";
 import { Check, ExternalLink, FolderPlus, ListPlus, Play, RotateCcw, Star, X } from "lucide-react";
-import { api, type PlexCard, type PlexFilters, type PlexItemDetail } from "../../lib/api";
+import { api, oneYear, type PlexCard, type PlexFilters, type PlexItemDetail } from "../../lib/api";
 import { formatBytes, formatCompact, formatDecimal, formatRuntime } from "../../lib/format";
 import { notifyActionError } from "../../lib/actionErrors";
 import { DetailCustomizeMenu, Filterable, PrefToggle } from "./plexDetailUi";
@@ -427,11 +427,7 @@ export default function PlexInfo({
                       title={
                         onFilter ? t("plex.info.filterYear", { year: detail.year }) : undefined
                       }
-                      onClick={
-                        onFilter
-                          ? () => onFilter({ yearMin: detail.year, yearMax: detail.year })
-                          : undefined
-                      }
+                      onClick={onFilter ? () => onFilter(oneYear(detail.year)) : undefined}
                     >
                       {detail.year}
                     </Filterable>