refactor: clean up bunker implementation for better maintainability

- Extract reconnectBunkerSigner into reusable helper function
- Reduce excessive debug logging in App.tsx (90+ lines → 30 lines)
- Simplify account restoration logic with cleaner conditionals
- Remove verbose signing logs from highlightCreationService
- Keep only essential error logs for debugging
- Follows DRY principles and applesauce patterns

src/services/highlightCreationService.ts

@@ -116,9 +116,7 @@ export async function createHighlight(
   }
 
   // Sign the event
-  console.log('[bunker] Signing highlight event...', { kind: highlightEvent.kind, tags: highlightEvent.tags.length })
   const signedEvent = await factory.sign(highlightEvent)
-  console.log('[bunker] ✅ Highlight signed successfully!', { id: signedEvent.id.slice(0, 8) })
 
   // Use unified write service to store and publish
   await publishEvent(relayPool, eventStore, signedEvent)