style(ui): make footer prompt caret static (remove blink)

Drop the perpetual blink animation on the home footer's 'openboot $' caret
per the restrained, no-gratuitous-motion direction. Keep a static accent
caret. In-terminal-mockup cursors (config cards, explore empty state) keep
their blink since it's contextually meaningful there.

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

Author: fullstackjam

src/routes/+page.svelte

@@ -486,13 +486,6 @@
 		height: 1.02em;
 		background: var(--accent);
 		translate: 0 2px;
-		animation: blink 1.15s steps(1) infinite;
-	}
-
-	@keyframes blink {
-		50% {
-			opacity: 0;
-		}
 	}
 
 	.footer-cols {