v1.7: fix widget losing data after screen lock/reboot

Two root causes:
- Alarms don't survive reboot — BootReceiver now restarts alarm + triggers
  an immediate fetch on BOOT_COMPLETED
- onUpdate() drew from cached prefs but never fetched fresh data — now
  triggers an immediate refresh so the widget is live on every launcher redraw

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

app/src/main/java/me/khodak/claudeusage/ClaudeUsageWidget.kt

@@ -20,6 +20,7 @@ class ClaudeUsageWidget : AppWidgetProvider() {
         ids.forEach { updateWidget(context, manager, it) }
         if (PreferencesManager(context).isLoggedIn()) {
             UsageUpdateWorker.schedulePeriodicRefresh(context)
+            UsageUpdateWorker.triggerImmediateRefresh(context)
         }
     }