feat(play-next): show picks as category rows with reroll per row

Four rows: up next, because you played, longest on list, mood.
Each row rerolls alone and tracks its own loading state.
Mood change reloads only the mood row. Phones scroll each row
sideways; wider screens show 3 columns.

public/i18n/en.json

@@ -431,12 +431,17 @@
   },
   "PLAY_NEXT": {
     "TITLE": "What to play next",
-    "SUBTITLE": "Four games from your backlog: one like a game you played a lot, the one waiting longest, one at random, and one from the top of your own order. Pick a length and a mood.",
+    "SUBTITLE": "Games from your backlog in four rows: next in your order, like games you played a lot, waiting longest, and by mood. Pick a length for all rows and a mood for the last one.",
     "REASON": {
       "SIMILAR": "Because you played {{name}} ({{playtime}})",
-      "LONGEST": "On your list since {{date}}",
-      "RANDOM": "Random pick",
-      "NEXT_UP": "Next in your backlog"
+      "LONGEST": "On your list since {{date}}"
+    },
+    "CATEGORY": {
+      "NEXT_UP": "Up next",
+      "SIMILAR": "Because you played",
+      "LONGEST": "Longest on your list",
+      "RANDOM": "Random picks",
+      "MOOD": "Mood: {{mood}}"
     },
     "BUDGET_LABEL": "Time to beat",
     "BUDGET": {
@@ -447,10 +452,9 @@
     },
     "BUDGET_HINT": "Only games with a known time to beat (from IGDB).",
     "REROLL": "Other picks",
+    "REROLL_ROW": "Other picks for {{category}}",
     "START_PLAYING": "Start playing",
     "STARTED": "Now playing",
-    "ALL_SHOWN": "You have seen every game that fits.",
-    "START_OVER": "Start over",
     "EMPTY": "Your backlog is empty. Nice!",
     "EMPTY_BUDGET": "No backlog game fits this length. Try a longer one.",
     "ERROR_LOAD": "Could not load the picks.",