fix: remove opacity from auto badge for full readability

55% opacity was still too subdued. Use full primary foreground color
so the outlined badge is crisp and clearly readable in all themes.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Author: rajbos

vscode-extension/src/webview/usage/styles.css

@@ -364,7 +364,6 @@ background: var(--bg-tertiary);
 	border-radius: 3px;
 	border: 1px solid var(--text-primary);
 	color: var(--text-primary);
-	opacity: 0.55;
 	background: transparent;
 	vertical-align: middle;
 	line-height: 1.4;