Add Phase 1 Pocket Pascal UI: home, pantry, week plan, and plate.

Replace the hello-world shell with the elevated design system, bilingual screens, recipe/extras data, and the interactive Mein Teller view.

Co-authored-by: Cursor <cursoragent@cursor.com>

handover/component-library/lib/cx.ts

@@ -0,0 +1,4 @@
+/** Tiny className joiner — avoids pulling in clsx/tailwind-merge as a dependency. */
+export function cx(...parts: Array<string | false | null | undefined>): string {
+  return parts.filter(Boolean).join(" ");
+}