feat: persist draft messages and UI refinements

- Add dedicated draft-store with AsyncStorage persistence for drafts
  that survive app refresh/crash
- Reduce markdown bold weight from bold to medium (500)
- Various theme and component style updates
- Server bootstrap and config improvements

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

packages/app/src/components/headers/menu-header.tsx

@@ -19,7 +19,7 @@ export function MenuHeader({ title, rightContent }: MenuHeaderProps) {
   const MenuIcon = isMobile ? Menu : PanelLeft;
   const menuIconColor = !isMobile && isOpen
     ? theme.colors.foreground
-    : theme.colors.mutedForeground;
+    : theme.colors.foregroundMuted;
 
   return (
     <ScreenHeader