feat(picker): add the speedrun mood and the speedrun.com link

"What to play next" gets a Speedrun mood. The game detail links the
game's speedrun.com page when Core found one with verified runs; only
https://www.speedrun.com/ links are shown.

src/pages/GameDetail.jsx

@@ -1,7 +1,7 @@
 import {useEffect, useMemo, useState} from 'react';
 import {Link, useNavigate, useParams} from 'react-router-dom';
 import {useTranslation} from 'react-i18next';
-import {ArrowLeft, Clock, ExternalLink, Gamepad2, Image as ImageIcon, ImageOff, PanelTop, RotateCcw, ShieldOff, Trophy} from 'lucide-react';
+import {ArrowLeft, Clock, ExternalLink, Gamepad2, Image as ImageIcon, ImageOff, PanelTop, RotateCcw, ShieldOff, Timer, Trophy} from 'lucide-react';
 
 import {Badge} from '@/components/ui/badge';
 import {Button} from '@/components/ui/button';
@@ -24,6 +24,8 @@ import {apiFetch} from '../utils/api.js';
 import {hasSession} from '../utils/auth.js';
 import {isSteamKey} from '../utils/manualGames.js';
 
+const SPEEDRUN_PREFIX = 'https://www.speedrun.com/';
+
 const formatUnlockedAt = (instant, locale) => {
     if (!instant) return '';
     try {
@@ -103,6 +105,9 @@ export default function GameDetail() {
 
     const manual = data?.source === 'MANUAL';
     const onSteam = !!data && isSteamKey(data.appid);
+    // Core checks the link too; a link from the API must never run script.
+    const speedrunUrl = typeof data?.speedrunUrl === 'string' && data.speedrunUrl.startsWith(SPEEDRUN_PREFIX)
+        ? data.speedrunUrl : null;
     const isBackground = !!data && appearance.backgroundAppid === data.appid;
     const isBanner = !!data && appearance.showBanner && appearance.bannerAppid === data.appid;
 
@@ -154,6 +159,13 @@ export default function GameDetail() {
                                 <div className="mt-3">
                                     <TimeToBeat time={data.timeToBeat}/>
                                 </div>
+                                {speedrunUrl && (
+                                    <Button asChild variant="outline" size="sm" className="mt-3">
+                                        <a href={speedrunUrl} target="_blank" rel="noopener noreferrer">
+                                            <Timer/>{t('GAME_DETAIL.OPEN_IN_SPEEDRUN')}<ExternalLink/>
+                                        </a>
+                                    </Button>
+                                )}
                             </div>
                             {/* Store page, background and banner need Steam art, so a game off Steam has none of them. */}
                             {onSteam && <div className="flex flex-wrap gap-2">