fix: default analytics date range to 1y instead of 30d

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

Author: wesm

frontend/src/lib/stores/analytics.svelte.ts

@@ -56,7 +56,7 @@ type Panel =
   | "topSessions";
 
 class AnalyticsStore {
-  from: string = $state(daysAgo(30));
+  from: string = $state(daysAgo(365));
   to: string = $state(today());
   granularity: Granularity = $state("day");
   metric: HeatmapMetric = $state("messages");