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/components/SchoolMap.module.css

@@ -7,6 +7,7 @@
 .mapWrapper.fullscreen {
   width: 100vw;
   height: 100vh;
+  height: 100dvh;
 }
 
 .fullscreenBtn {