More refactoring and integration of standards dataset database

apps/portal/src/routes/(app)/calculator/+page.svelte

@@ -1,6 +1,6 @@
 <script lang="ts">
     import {
-        DEFAULT_STANDARDS_DATA,
+        DEFAULT_STANDARDS_DATASET,
         Standards,
         type StandardsParameters,
     } from "@blade-and-brawn/calculator";
@@ -15,7 +15,7 @@
 
     let activeTab = $state("standards");
 
-    const defaultStandards = new Standards(DEFAULT_STANDARDS_DATA);
+    const defaultStandards = new Standards(DEFAULT_STANDARDS_DATASET);
 
     let input = $state({
         activity: Activity.BenchPress,
@@ -38,12 +38,15 @@
     });
 
     const allStandards = $derived(
-        new Standards(DEFAULT_STANDARDS_DATA, selected.params),
+        new Standards(DEFAULT_STANDARDS_DATASET, selected.params),
     );
 
     $effect(() => {
         const savedParameters = localStorage.getItem("parameters");
-        if (savedParameters) input = JSON.parse(savedParameters);
+        if (!savedParameters) return;
+
+        const parsed = JSON.parse(savedParameters);
+        if (parsed?.params) input = parsed;
     });
 
     $effect(() => {