feat: bulk XML upload, period selector, and session persistence

- Add bulk XML CFDI upload support (up to 300MB)
- Add period selector component for month/year navigation
- Fix session persistence on page refresh (Zustand hydration)
- Fix income/expense classification based on tenant RFC
- Fix IVA calculation from XML (correct Impuestos element)
- Add error handling to reportes page
- Support multiple CORS origins
- Update reportes service with proper Decimal/BigInt handling
- Add RFC to tenant view store for proper CFDI classification
- Update README with changelog and new features

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

apps/web/components/layouts/header.tsx

@@ -15,7 +15,12 @@ const themeIcons: Record<ThemeName, React.ReactNode> = {
 
 const themeOrder: ThemeName[] = ['light', 'vibrant', 'corporate', 'dark'];
 
-export function Header({ title }: { title: string }) {
+interface HeaderProps {
+  title: string;
+  children?: React.ReactNode;
+}
+
+export function Header({ title, children }: HeaderProps) {
   const { theme, setTheme } = useThemeStore();
 
   const cycleTheme = () => {
@@ -26,7 +31,10 @@ export function Header({ title }: { title: string }) {
 
   return (
     <header className="sticky top-0 z-30 flex h-16 items-center justify-between border-b bg-background/95 backdrop-blur px-6">
-      <h1 className="text-xl font-semibold">{title}</h1>
+      <div className="flex items-center gap-4">
+        <h1 className="text-xl font-semibold">{title}</h1>
+        {children}
+      </div>
 
       <div className="flex items-center gap-3">
         <TenantSelector />