Disable autocapture and debug analytics per PostHog SwiftUI best practices

- Disable captureElementInteractions (UIKit-only, duplicates manual events)
- Disable captureScreenViews (meaningless SwiftUI names, duplicates trackScreen())
- Opt out entirely in DEBUG builds to prevent test data polluting production

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

Shared/Analytics.swift

@@ -67,10 +67,12 @@ final class AnalyticsManager {
         // enabling accurate unique user counts without requiring identify() calls
         config.personProfiles = .always
 
-        // Auto-capture
-        config.captureElementInteractions = true
+        // Auto-capture — disabled for SwiftUI (PostHog docs recommend manual tracking)
+        // captureElementInteractions: UIKit-only, generates noisy $autocapture events
+        // captureScreenViews: produces meaningless SwiftUI internal names, duplicates manual trackScreen()
+        config.captureElementInteractions = false
         config.captureApplicationLifecycleEvents = true
-        config.captureScreenViews = true
+        config.captureScreenViews = false
 
         // Session replay
         config.sessionReplay = sessionReplayEnabled
@@ -85,8 +87,7 @@ final class AnalyticsManager {
         }
 
         #if DEBUG
-        config.debug = true
-        config.flushAt = 1
+        config.optOut = true // Prevent debug/test data from polluting production analytics
         #endif
 
         PostHogSDK.shared.setup(config)