fix: standardize relative timestamping (#3612)

* fix(frontend): relative timestamps are incorrectly rounded.

Closes: #1371

* fix(all): remove legacy fromNow for proper relative timestamp creation

Closes: #1395

apps/frontend/src/pages/frog.vue

@@ -1,4 +1,6 @@
 <script setup lang="ts">
+import { useRelativeTime } from "@modrinth/ui";
+
 const vintl = useVIntl();
 const { formatMessage } = vintl;