feat(plex): the person page in two columns; a bio on its way holds its place (E30 S6)

The biography sat at reading width in the left half of a full-width panel with nothing on the right.
Now the person (headshot, facts, the bio clamped to eight lines with More / Less when it is cut) is on the
left and "Known for" on the right; with fewer than four titles the rail takes only its posters' width.
One column where the panel is narrow (200% zoom, the largest text size).

While the server fetches a bio (`enriching`), the page shows a paragraph skeleton (a new "text" shape of
LoadingState) and asks again every 1.5 s for up to 20 s. The view is keyed by the person's name, so
another person starts fresh.

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

@@ -352,7 +352,10 @@
     "born": "Born",
     "died": "Died",
     "aka": "Also known as",
-    "knownFor": "Known for"
+    "knownFor": "Known for",
+    "bioLoading": "Loading the biography",
+    "more": "More",
+    "less": "Less"
   },
   "view": {
     "label": "View",

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

@@ -352,7 +352,10 @@
     "born": "Született",
     "died": "Elhunyt",
     "aka": "Más néven",
-    "knownFor": "Ismert szerepei"
+    "knownFor": "Ismert szerepei",
+    "bioLoading": "Az életrajz betöltése",
+    "more": "Több",
+    "less": "Kevesebb"
   },
   "view": {
     "label": "Nézet",