Add a Help page with FAQ and contact form

Adds a /help route with an animated FAQ accordion and a contact form
(persisted via a new contact_messages table). The per-order-item "Get
help" link now points here and passes the order/item/status as search
params, which the page uses to show a short, state-specific note and
prefill the message field.

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

drizzle/meta/_journal.json

@@ -36,6 +36,13 @@
       "when": 1789036823859,
       "tag": "0004_misty_hedge_knight",
       "breakpoints": true
+    },
+    {
+      "idx": 5,
+      "version": "7",
+      "when": 1789636006749,
+      "tag": "0005_tan_power_man",
+      "breakpoints": true
     }
   ]
 }