fix: grid minmax 260→220 避免 1200 viewport 下卡片溢出

1200 宽度下 main padding 缩到 2.5rem（media query），可用宽度 840px。
3 × minmax(260, 1fr) + 2 gap = 872 超出 32px。
改成 minmax(220, 1fr)，3 × 220 + 32 = 692 < 840，留足余量。

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

.memory/worklog.json

@@ -62,6 +62,132 @@
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 }

index.html

@@ -133,7 +133,7 @@
   .card.warn{border-left:3px solid var(--yellow)}
   .card h4{margin-top:0}
 
-  .grid{display:grid;gap:1rem;grid-template-columns:repeat(auto-fit,minmax(260px,1fr));margin:1rem 0}
+  .grid{display:grid;gap:1rem;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));margin:1rem 0}
 
   .tldr{
     background:linear-gradient(135deg,#2a1f1a,#1a2a26);