Make search global: modal opened from sidebar, mobile menu and / key

src/lib/searchModal.svelte.ts

@@ -0,0 +1,15 @@
+let open = $state(false);
+
+export const searchModal = {
+  get open() {
+    return open;
+  },
+};
+
+export function openSearch() {
+  open = true;
+}
+
+export function closeSearch() {
+  open = false;
+}