style: apply Prettier formatting across codebase

Isolated reformat commit so subsequent logic changes have clean diffs.
No behavior change.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

src/app.css

@@ -1,14 +1,17 @@
-*, *::before, *::after {
+*,
+*::before,
+*::after {
 	box-sizing: border-box;
 	margin: 0;
 	padding: 0;
 }
 
-html, body {
+html,
+body {
 	width: 100%;
 	height: 100%;
 	margin: 0;
 	padding: 0;
 	overflow: hidden;
 	background: #05050a;
-}
+}