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/build.gradle.kts

@@ -11,8 +11,8 @@ android {
         applicationId = "me.khodak.claudeusage"
         minSdk = 26
         targetSdk = 34
-        versionCode = 7
-        versionName = "1.6"
+        versionCode = 8
+        versionName = "1.7"
     }
 
     signingConfigs {