feat(mobile): iOS polish — theme-color, safe-area, dvh, tap-highlight

MOB-19: Add a viewport Viewport export with viewportFit: 'cover' and
themeColor entries for light (#faf7f2) / dark (#1a1612), plus the
appleWebApp metadata for the home-screen status bar style and title.
Manifest's stale #3b82f6 theme_color updated to match brand cream.

MOB-20: Apply env(safe-area-inset-*) to the sticky chrome — the top
header gets max(padding, inset-left/right) so the logo and tab links
clear the notch in landscape; the bottom tab bar already had
inset-bottom and now also gets inset-left/right.

MOB-21: Replace 100vh with 100dvh in body min-height, modal max-heights,
the map view container, and the fullscreen map. Older engines fall
back via the duplicated vh declaration.

MOB-22: Set -webkit-tap-highlight-color: transparent on body to
suppress the iOS Safari grey flash; add a generic touch-pointer
:active rule (opacity 0.7) so taps still register visually on plain
anchors and bare buttons. Components with their own :active styling
are unaffected.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

nextjs-app/app/layout.tsx

@@ -1,4 +1,4 @@
-import type { Metadata } from 'next';
+import type { Metadata, Viewport } from 'next';
 import { DM_Sans, Playfair_Display } from 'next/font/google';
 import Script from 'next/script';
 import { Navigation } from '@/components/Navigation';
@@ -21,7 +21,24 @@ const playfairDisplay = Playfair_Display({
   display: 'swap',
 });
 
+export const viewport: Viewport = {
+  width: 'device-width',
+  initialScale: 1,
+  // viewport-fit=cover lets us paint behind the notch / Dynamic Island so
+  // env(safe-area-inset-*) values resolve to real numbers on iPhone.
+  viewportFit: 'cover',
+  themeColor: [
+    { media: '(prefers-color-scheme: light)', color: '#faf7f2' },
+    { media: '(prefers-color-scheme: dark)', color: '#1a1612' },
+  ],
+};
+
 export const metadata: Metadata = {
+  appleWebApp: {
+    capable: true,
+    title: 'SchoolCompare',
+    statusBarStyle: 'default',
+  },
   title: {
     default: 'SchoolCompare | Compare School Performance',
     template: '%s | SchoolCompare',