feat(home): move "use my location" beside the hero search box

The geolocation shortcut lived in the discovery strip below the results,
away from the search. Move it directly under the hero search input, paired
with the postcode hint, so the two ways to find nearby schools ("type a
postcode" / "use my location") read as one idea and are visible at first
glance.

- FilterBar gains optional onNearMe/geoState/geoError props and renders the
  teal "Use my location" pill (with spinner + error) in hero mode; the
  geolocation flow itself still lives in HomeView.
- Remove the now-duplicate near-me button and its dead CSS from the
  discovery section.
- Refresh the search hint copy to pair with the button.
- e2e: assert the "use my location" shortcut renders in the hero.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

nextjs-app/components/HomeView.tsx

@@ -284,37 +284,11 @@ export function HomeView({ initialSchools, filters, totalSchools, howItWorks, ed
         filters={filters}
         isHero={!isSearchActive}
         resultFilters={initialSchools.result_filters}
+        onNearMe={handleNearMe}
+        geoState={geoState}
+        geoError={geoError}
       />
 
-      {/* Discovery section shown on landing page before any search */}
-      {!isSearchActive && initialSchools.schools.length === 0 && (
-        <div className={styles.discoverySection}>
-          <div className={styles.nearMeRow}>
-            <button
-              className={styles.nearMeBtn}
-              onClick={handleNearMe}
-              disabled={geoState === 'requesting'}
-            >
-              {geoState === 'requesting' ? (
-                <>
-                  <span className={styles.nearMeBtnSpinner} aria-hidden="true" />
-                  Locating you…
-                </>
-              ) : (
-                <>
-                  <svg width="15" height="15" viewBox="0 0 24 24" fill="none" stroke="currentColor" strokeWidth="2.5" aria-hidden="true">
-                    <path d="M12 2a7 7 0 0 1 7 7c0 5.25-7 13-7 13S5 14.25 5 9a7 7 0 0 1 7-7z"/>
-                    <circle cx="12" cy="9" r="2.5"/>
-                  </svg>
-                  Schools near me
-                </>
-              )}
-            </button>
-            {geoError && <p className={styles.geoError} role="alert">{geoError}</p>}
-          </div>
-        </div>
-      )}
-
       {/* Admissions countdown strip — only on landing page */}
       {!isSearchActive && (
         <section className={styles.admissionsStrip}>