Add menu item customization/detail pages and configurable currency formatting

Lets customers pick options on a menu item detail page before adding to the
basket, and makes displayed prices respect a configurable currency/locale
via VITE_CURRENCY/VITE_LOCALE. Also crossfades the basket's empty/filled
states with AnimatePresence in wait mode instead of animating both at once.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

drizzle/meta/_journal.json

@@ -29,6 +29,13 @@
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       "tag": "0003_soft_psynapse",
       "breakpoints": true
+    },
+    {
+      "idx": 4,
+      "version": "7",
+      "when": 1789036823859,
+      "tag": "0004_misty_hedge_knight",
+      "breakpoints": true
     }
   ]
 }