feat(tables): name a filter whose column is off screen, and let its chip clear it

A tabletHidden/narrowHidden column below its width, or any column in a card
layout, took its header funnel with it: the rows were narrowed by a filter
nobody could see. The cue is shown by the inverse of the column's own
container query, so it agrees with the table at every width and text size.
Wired into DataTable, the playlist table and the channel cards (E28 F2).

frontend/src/i18n/locales/en/datatable.json

@@ -5,6 +5,11 @@
   "rowsPerPage": "Rows per page",
   "noOptions": "No options",
   "empty": "Nothing to show.",
+  "hiddenFilter": {
+    "label_one": "Filtered by a hidden column:",
+    "label_other": "Filtered by hidden columns:",
+    "remove": "Remove filter: {{name}}"
+  },
   "pager": {
     "first": "First page",
     "prev": "Previous page",

frontend/src/i18n/locales/hu/datatable.json

@@ -5,6 +5,11 @@
   "rowsPerPage": "Sor/oldal",
   "noOptions": "Nincs lehetőség",
   "empty": "Nincs megjeleníthető elem.",
+  "hiddenFilter": {
+    "label_one": "Rejtett oszlop szűr:",
+    "label_other": "Rejtett oszlopok szűrnek:",
+    "remove": "Szűrő eltávolítása: {{name}}"
+  },
   "pager": {
     "first": "Első oldal",
     "prev": "Előző oldal",