Survivor side (1/4): safety guidance + first-run onboarding

- OnboardingScreen: first-launch explainer (what it does, the offline promise, why it needs each permission), then requests permissions.
- SafetyScreen: 'if a tracker is following you' guidance — get safe, think before removing, document, report — with Call 911, the US DV Hotline (call / text START), and SPARC stalking resources. Every action hands off to the dialer/messages/browser; VIGIL stays offline.
- Entry points: a Safety icon in the top bar, and a red 'What should I do?' button on ALERTING/SUSPICIOUS trackers.
Release 0.1.8.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_0187UiEtasyowhEBYs6s9iF5

app/build.gradle.kts

@@ -13,8 +13,8 @@ android {
         applicationId = "org.soulstone.vigil"
         minSdk = 26
         targetSdk = 35
-        versionCode = 8
-        versionName = "0.1.7"
+        versionCode = 9
+        versionName = "0.1.8"
     }
 
     // Fixed debug keystore committed to the repo (a debug key is non-secret — its