feat(search): align the map view with the mockup and open it on desktop

The map view now follows option B of the results-controls mockups:

- The list sits in a pane on the left, under the result count and sort,
  and the map fills the rest of the screen below the pinned toolbar. The
  toolbar's height is measured, so the split ends 1rem above the bottom
  of the screen however the controls wrap.
- Pins are brand-teal dots and the selected one is coral. The search
  location is an ink dot, the search radius a dashed circle with its
  distance, and the view fits that circle. Tiles are muted and the zoom
  sits under the fullscreen button.
- A school picked on the map or in the list opens a card on the map
  (View, + Compare, following the basket), and its list card is ringed
  and scrolled into view. Phones keep the bottom sheet.
- The list cards show the full name, Ofsted and school type, the
  headline figure and pupils.

The map cards now follow the list rows: no England benchmark for
special schools, PRUs and AP, and no placeholder all-zero RWM (Greenmead
showed "0% RWM -62 pts vs national"). That rule moves to a shared
listRwmValue helper.

A postcode search opens on the map for desktop browsers, chosen on the
server from the user agent so the list never paints first. The client
falls back to the list below 1024px, and follows the default through
client-side navigation from the hero until the reader picks a view.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

nextjs-app/components/SchoolMap.module.css

@@ -74,3 +74,173 @@
   font-size: 0.9375rem;
   margin: 0;
 }
+
+/* ── Results map skin ──────────────────────────────────────────────────────
+   Leaflet renders these outside React, so they are global class names, scoped
+   under .mapWrapper to keep this module pure. Pins are brand teal, the chosen
+   one coral; the search location is ink, ringed. */
+
+/* Muted tiles so the pins, not the streets, carry the colour. */
+.mapWrapper :global(.leaflet-tile-pane) {
+  filter: saturate(0.45);
+}
+
+/* The fullscreen button owns the top-right corner; zoom stacks under it. */
+.mapWrapper :global(.leaflet-top.leaflet-right) {
+  top: 2.75rem;
+}
+
+.mapWrapper :global(.sc-pin) {
+  box-sizing: border-box;
+  border-radius: 50%;
+  background: var(--brand);
+  border: 2.5px solid var(--bg-card);
+  box-shadow: 0 2px 5px rgba(var(--shadow-rgb), 0.35);
+  transition: transform 0.12s ease;
+}
+
+.mapWrapper :global(.sc-pin:hover) {
+  transform: scale(1.15);
+}
+
+.mapWrapper :global(.sc-pin--selected) {
+  background: var(--action);
+  border-width: 3px;
+}
+
+.mapWrapper :global(.sc-pin:focus-visible) {
+  outline: 3px solid var(--text-primary);
+  outline-offset: 2px;
+}
+
+.mapWrapper :global(.sc-home) {
+  border-radius: 50%;
+  background: var(--text-primary);
+  box-shadow: 0 0 0 6px rgba(var(--shadow-rgb), 0.18);
+}
+
+.mapWrapper :global(.sc-radius) {
+  stroke: var(--brand);
+  stroke-width: 2px;
+  stroke-dasharray: 6 6;
+  fill: var(--brand);
+  fill-opacity: 0.05;
+}
+
+.mapWrapper :global(.sc-radius-label) {
+  width: auto !important;
+  height: auto !important;
+  transform-origin: center;
+  translate: -50% -50%;
+  padding: 0.125rem 0.625rem;
+  background: var(--bg-card);
+  border: 1px solid var(--brand);
+  border-radius: 999px;
+  font-family: var(--font-ui);
+  font-size: 0.75rem;
+  font-weight: 700;
+  color: var(--brand-strong);
+  white-space: nowrap;
+}
+
+/* The selected school's card, drawn as a card rather than a speech bubble. */
+.mapWrapper :global(.sc-popup .leaflet-popup-content-wrapper) {
+  border-radius: 14px;
+  box-shadow: 0 10px 28px rgba(var(--shadow-rgb), 0.22);
+}
+
+.mapWrapper :global(.sc-popup .leaflet-popup-content) {
+  margin: 0.875rem 1rem;
+  font-family: var(--font-ui);
+}
+
+.mapWrapper :global(.sc-card) {
+  display: flex;
+  flex-direction: column;
+  gap: 0.5rem;
+}
+
+.mapWrapper :global(.sc-card-head) {
+  display: flex;
+  justify-content: space-between;
+  align-items: flex-start;
+  gap: 0.5rem;
+  padding-right: 1rem; /* clear of the popup's × */
+}
+
+.mapWrapper :global(.sc-card-name) {
+  font-family: var(--font-display);
+  font-size: 0.9375rem;
+  font-weight: 700;
+  line-height: 1.3;
+  color: var(--text-primary);
+  text-decoration: none;
+}
+
+.mapWrapper :global(.sc-card-name:hover) {
+  text-decoration: underline;
+}
+
+.mapWrapper :global(.sc-dist) {
+  flex-shrink: 0;
+  padding: 0.125rem 0.375rem;
+  border-radius: 4px;
+  background: var(--brand);
+  color: var(--brand-on);
+  font-size: 0.75rem;
+  font-weight: 700;
+  white-space: nowrap;
+}
+
+.mapWrapper :global(.sc-card-tags) {
+  display: flex;
+  flex-wrap: wrap;
+  gap: 0.375rem;
+}
+
+.mapWrapper :global(.sc-ofsted),
+.mapWrapper :global(.sc-tag) {
+  padding: 0.125rem 0.4375rem;
+  border-radius: 4px;
+  font-size: 0.6875rem;
+  font-weight: 600;
+  white-space: nowrap;
+}
+
+.mapWrapper :global(.sc-tag) {
+  background: var(--bg-secondary);
+  color: var(--text-secondary);
+  font-weight: 500;
+}
+
+.mapWrapper :global(.sc-ofsted1),
+.mapWrapper :global(.sc-ofsted2) { background: var(--status-above-bg); color: var(--status-above); }
+.mapWrapper :global(.sc-ofsted3) { background: var(--status-below-bg); color: var(--status-below); }
+.mapWrapper :global(.sc-ofsted4) { background: var(--status-below); color: var(--text-inverse); }
+.mapWrapper :global(.sc-ofstedRc) { background: var(--phase-secondary-text); color: var(--text-inverse); }
+.mapWrapper :global(.sc-ofstedInspected) { background: var(--phase-primary-bg); color: var(--phase-primary-text); }
+.mapWrapper :global(.sc-ofstedPending) { background: var(--border); color: var(--text-muted); }
+
+.mapWrapper :global(.sc-card-metric) {
+  font-size: 0.8125rem;
+  color: var(--text-secondary);
+}
+
+.mapWrapper :global(.sc-card-metric strong) {
+  font-size: 0.9375rem;
+  color: var(--text-primary);
+}
+
+.mapWrapper :global(.sc-up) { color: var(--status-above); font-weight: 600; }
+.mapWrapper :global(.sc-down) { color: var(--status-below); font-weight: 600; }
+
+.mapWrapper :global(.sc-card-actions) {
+  display: flex;
+  gap: 0.5rem;
+}
+
+.mapWrapper :global(.sc-card-actions > *) {
+  flex: 1;
+  justify-content: center;
+  text-align: center;
+}