feat: extract event descriptions from Game8 detail tables

Column tables already carried a description column, but label/value detail
tables did not — Genshin events had no blurb at all. The page follows each
detail table with a sentence of prose, so take that, skipping the
call-to-action paragraphs, which are navigation rather than description.

Summary coverage goes from 13/22 events to 22/22.

Co-Authored-By: Claude Opus 5 (1M context) <[email protected]>

fixtures/genshin/game8-events-2026-08-14.expected.json

@@ -4,7 +4,7 @@
     "game": "genshin",
     "title": "To Temper Thyself and Journey Far",
     "type": "other",
-    "summary": null,
+    "summary": "In the To Temper Thyself and Journey Far event, players can complete the Daily and Weekly Training Goals to claim various rewards, including a 5-Star constellation from a character of their choice in the selection pool!",
     "startsAt": "2026-08-10T00:00:00.000Z",
     "startPrecision": "day",
     "endsAt": "2026-11-02T00:00:00.000Z",
@@ -25,7 +25,7 @@
     "game": "genshin",
     "title": "Battle Pass - Frostfarer",
     "type": "other",
-    "summary": null,
+    "summary": "Participate in the free Sojourner's Battle Pass and the for-purchase Gnostic Hymn to receive prizes as you increase your BP Level.",
     "startsAt": "2026-08-12T00:00:00.000Z",
     "startPrecision": "day",
     "endsAt": "2026-09-21T00:00:00.000Z",
@@ -46,7 +46,7 @@
     "game": "genshin",
     "title": "Character Test Runs",
     "type": "challenge",
-    "summary": null,
+    "summary": "The Character Test Run is available at the same time as the Character Banners in Phase 1 of Version 7.0 from August 12, 2026 to September 1, 2026!",
     "startsAt": "2026-08-12T00:00:00.000Z",
     "startPrecision": "day",
     "endsAt": "2026-09-01T00:00:00.000Z",
@@ -67,7 +67,7 @@
     "game": "genshin",
     "title": "Mutual Aid in Bloom: Into the Frostlands",
     "type": "other",
-    "summary": null,
+    "summary": "Take photos and complete objectives in this Snezhnaya exploration event!",
     "startsAt": "2026-08-12T00:00:00.000Z",
     "startPrecision": "day",
     "endsAt": "2026-08-24T00:00:00.000Z",
@@ -88,7 +88,7 @@
     "game": "genshin",
     "title": "Snezhnaya Travel Guide Web Event",
     "type": "other",
-    "summary": null,
+    "summary": "Earn rewards from progressing the 7.0 quests, initiating new combat and exploration mechanics, and connecting with other players via invitation codes!",
     "startsAt": "2026-08-12T00:00:00.000Z",
     "startPrecision": "day",
     "endsAt": "2026-08-25T00:00:00.000Z",
@@ -109,7 +109,7 @@
     "game": "genshin",
     "title": "Stygian Onslaught",
     "type": "challenge",
-    "summary": null,
+    "summary": "The Stygian Onslaught event is a recurring boss rush event where you must defeat three field bosses in different difficulties, solo or in Co-Op.",
     "startsAt": "2026-08-19T00:00:00.000Z",
     "startPrecision": "day",
     "endsAt": "2026-09-22T00:00:00.000Z",
@@ -130,7 +130,7 @@
     "game": "genshin",
     "title": "Great Expeditionist Challenge",
     "type": "challenge",
-    "summary": null,
+    "summary": "Join the Adventurer's Guild Tournament to play minigames and win prizes in the 7.0 flagship event, Great Expeditionist Challenge!",
     "startsAt": "2026-08-28T00:00:00.000Z",
     "startPrecision": "day",
     "endsAt": "2026-09-14T00:00:00.000Z",
@@ -151,7 +151,7 @@
     "game": "genshin",
     "title": "Trial of the Bastion",
     "type": "challenge",
-    "summary": null,
+    "summary": "Construct mechanisms and use firearms to defend your stronghold in the base defense event, Trial of the Bastion!",
     "startsAt": "2026-09-07T00:00:00.000Z",
     "startPrecision": "day",
     "endsAt": "2026-09-17T00:00:00.000Z",
@@ -172,7 +172,7 @@
     "game": "genshin",
     "title": "Overflowing Abundance Rerun",
     "type": "rerun",
-    "summary": null,
+    "summary": "Get double the Talent Level-Up and Weapon Ascension rewards from domains in the return of the Overflowing Abundance event!",
     "startsAt": "2026-09-14T00:00:00.000Z",
     "startPrecision": "day",
     "endsAt": "2026-09-21T00:00:00.000Z",