feat(hikes): view-transition exit flow off detail page

Fires the same strip-slide-out + below-strip-fly-down animation whenever
a hike detail page is left for anywhere other than another slug — not
just on the back-to-/hikes path. Layout adds a new `vt-exit-hike-detail`
class on the document root for that case; the css rules tag onto the
existing `vt-enter-hikes` selectors so both exits drive identical
animations.

package.json

@@ -1,6 +1,6 @@
 {
 	"name": "homepage",
-	"version": "1.92.0",
+	"version": "1.93.0",
 	"private": true,
 	"type": "module",
 	"scripts": {