ui: Constants refactor (#26908)

* refactor: Constants

* refactor: Constants/Enums cleanup

* refactor: Constant objects instead of multiple single value constants

* refactor: Cleanup constants

tools/ui/tests/client/ui-settings-sync.svelte.test.ts

@@ -1,4 +1,4 @@
-import { CONFIG_LOCALSTORAGE_KEY } from '$lib/constants/storage';
+import { CONFIG_LOCALSTORAGE_KEY } from '$lib/constants';
 import { serverStore } from '$lib/stores/server.svelte';
 import { config, settingsStore } from '$lib/stores/settings.svelte';
 import { beforeEach, describe, expect, it } from 'vitest';