Fix working indicator padding calculation

Account for list's spacing[2] padding - use spacing[2] for bubble
so total equals spacing[4] to match input area

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

packages/app/src/components/agent-stream-view.tsx

@@ -1073,7 +1073,7 @@ const stylesheet = StyleSheet.create((theme) => ({
     gap: theme.spacing[2],
     paddingHorizontal: 0,
     paddingVertical: theme.spacing[1],
-    paddingLeft: theme.spacing[4],
+    paddingLeft: theme.spacing[2],
     borderRadius: theme.borderRadius.full,
     backgroundColor: "transparent",
     borderWidth: 0,