fix(stores): merge defaults on PersistedState deserialize so new fields get defaults

runed PersistedState hydrates raw stored JSON without merging defaults, so any
field added after a user's first session is undefined rather than its default value.
Apply a shallow spread (defaults → stored) in the custom serializer for badges,
leads, and pres_mgmt stores so new fields always fall back to defaults for
existing sessions — without disrupting any previously saved preferences.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/lib/stores/ae_events_stores__leads.svelte.ts

@@ -18,4 +18,9 @@
 import { PersistedState } from 'runed';
 import { leads_loc_defaults } from './ae_events_stores__leads_defaults';
 
-export const leads_loc = new PersistedState('ae_leads_loc', leads_loc_defaults);
+export const leads_loc = new PersistedState('ae_leads_loc', leads_loc_defaults, {
+    serializer: {
+        serialize: JSON.stringify,
+        deserialize: (raw: string) => ({ ...leads_loc_defaults, ...JSON.parse(raw) })
+    }
+});