feat: smaller imports and exports (#373)

* feat: smaller imports and exports

* test(prefs): extend tests

* style(clippy)

* style: bubble up error

* style: update some wording

static/copy.js

@@ -0,0 +1,9 @@
+async function copy() {
+    await navigator.clipboard.writeText(document.getElementById('bincode_str').value);
+}
+
+async function set_listener() {
+    document.getElementById('copy').addEventListener('click', copy);
+}
+
+window.addEventListener('load', set_listener);