Fix(pwa): keep the status-bar strip hit-testable for iOS's edge blur check

iOS 26+ draws its scroll-edge blur over the top of a Home Screen web app
unless a hit test at the top edge finds a fixed, viewport-wide box with
a plain background colour (WebKit's LocalFrameView::fixedContainerEdges,
which honours pointer-events on its first pass). The safe-area strip is
exactly that box; it no longer opts out of hit testing.

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_013GbLTGMZ45MV78qd2tHoco

frontend/components/Nav.vue

@@ -3,8 +3,13 @@
        in index.html — the only way to get a live status-bar tint on iOS PWA, since WebKit
        ignores JS theme-color writes and media-variant theme-color tags in standalone mode.
        Color tracks --page-bg (style.css), which follows .dark class.
-       It and the header below stay put through page transitions (jn-site-* in style.css). -->
-  <div class="jn-site-status-bar fixed top-0 left-0 right-0 z-50 pointer-events-none transition-colors duration-300"
+       It and the header below stay put through page transitions (jn-site-* in style.css).
+       It stays hit-testable on purpose: iOS 26+ decides whether to draw its Liquid Glass
+       scroll-edge blur over the top of a Home Screen web app by hit-testing the top edge
+       for a fixed, viewport-wide box with a plain background colour (WebKit
+       LocalFrameView::fixedContainerEdges); pointer-events: none would hide this strip
+       from that first pass. -->
+  <div class="jn-site-status-bar fixed top-0 left-0 right-0 z-50 transition-colors duration-300"
     style="height: env(safe-area-inset-top); background: var(--page-bg);" aria-hidden="true"></div>
   <header
     class="jn-site-nav fixed top-[env(safe-area-inset-top)] left-0 right-0 z-40 w-full border-b transition-transform duration-300 ease-out will-change-transform"