fix(code): stop scaling italics 1.18× in markdown

Radix Themes ships --em-font-size-adjust: 1.18 (and the same for Quote)
to make Times New Roman italic visually match the surrounding sans body.
Since we override --em-font-family / --quote-font-family to Open Runde,
the compensation no longer applies and just makes italics render ~18%
larger than neighbouring text — the "hilariously large" italics seen in
agent chat. Set both adjustments to 1.

Generated-By: PostHog Code
Task-Id: ad6f03b1-a226-42a3-99df-47cb2ed0a51f

Author: PostHog Code

apps/code/src/renderer/styles/globals.css

@@ -321,6 +321,15 @@
   --quote-font-family: var(--font-sans);
   --code-font-family: var(--font-mono);
 
+  /*
+   * Radix's defaults assume Times New Roman italic (smaller x-height) and
+   * scale Em / Quote up by 1.18× to compensate. Since we render them in
+   * Open Runde — same metrics as body text — that compensation makes
+   * italics conspicuously oversized. Disable the adjustment.
+   */
+  --em-font-size-adjust: 1;
+  --quote-font-size-adjust: 1;
+
   /* Font weights — Berkeley Mono provides 400/700, JetBrains Mono fills 300/500/600 */
   --font-weight-light: 300;
   --font-weight-regular: 400;