Fix visual artifacting on macOS 26 in New Tab Page (#1972)

Add backdrop-filter: blur(0px) to body element to resolve visual
rendering artifacts that occur on macOS 26.

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-authored-by: Claude <noreply@anthropic.com>

Author: noisysocks

special-pages/pages/new-tab/app/styles/base.css

@@ -25,6 +25,9 @@ body {
     user-select: none;
     -webkit-user-select: none;
     cursor: default;
+
+    /* Fix visual artifacting on macOS 26 */
+    backdrop-filter: blur(0px);
 }
 /** Allow debugging error messages to be selected for debugging **/
 :root[data-fatal-error] body {