web/api: send parameters to server only if they differ from defaults

web/src/lib/settings/lazy-get.ts

@@ -0,0 +1,14 @@
+import type { CobaltSettings } from "$lib/types/settings";
+import defaults from "./defaults";
+
+export default function lazySettingGetter(settings: CobaltSettings) {
+    // Returns the setting value only if it differs from the default.
+    return <
+        Context extends Exclude<keyof CobaltSettings, 'schemaVersion'>,
+        Id extends keyof CobaltSettings[Context]
+    >(context: Context, key: Id) => {
+        if (defaults[context][key] !== settings[context][key]) {
+            return settings[context][key];
+        }
+    }
+}