fix(ai): actually set tabular-nums on the classic account card (PR #50 review)

The card's comment claimed "tabular-nums metadata" but no rule set font-variant-numeric,
so digits (the email, any future counter) weren't aligned. Set it on the .acctcard.classic
root — the house pattern here (used in ~10 other places) — so the comment is true and
numbers align throughout the card.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

Author: ndemianc

extensions/levelcode-ai/media/chat.html

@@ -847,6 +847,7 @@
     --cc-bg: #282c34; --cc-surface: #21252b; --cc-text: #dcdfe4; --cc-text2: #abb2bf; --cc-text3: #828997;
     --cc-line: #3e4451; --cc-accent: #7d6bff;
     --cc-mono: var(--vscode-editor-font-family, ui-monospace, "SF Mono", Menlo, Consolas, monospace);
+    font-variant-numeric: tabular-nums;   /* align digits across the card (email, any future counters) */
     max-width: 300px; padding: 24px 22px 20px; border-radius: 6px;
     background: var(--cc-surface); color: var(--cc-text); border: 1px solid var(--cc-line);
     box-shadow: 0 1px 2px rgba(0,0,0,.05);