add new customer button and route

customers could only be created indirectly via new order. add a
standalone /customers/new (GET+POST), reusing edit.njk for both create
and edit by keying off customer.id.

src/routes/customers.ts

@@ -20,6 +20,38 @@ router.get('/', (req, res) => {
   res.render('customers/list.njk', { customers, q });
 });
 
+router.get('/new', (req, res) => {
+  res.render('customers/edit.njk', { customer: {} });
+});
+
+router.post('/new', (req, res) => {
+  const b = req.body as Record<string, string>;
+
+  const name = (b.name || '').trim();
+  if (!name) return res.status(400).send('Name is required');
+
+  const info = db
+    .prepare(
+      `INSERT INTO customers
+         (name, phone, alt_phone, email, address_line1, address_line2, city, state, zip, internal_note)
+       VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?)`
+    )
+    .run(
+      name,
+      formatPhone(b.phone),
+      formatPhone(b.alt_phone),
+      b.email || null,
+      b.address_line1 || null,
+      b.address_line2 || null,
+      b.city || null,
+      b.state || null,
+      b.zip || null,
+      b.internal_note || null
+    );
+
+  res.redirect(303, `/customers/${info.lastInsertRowid}/edit`);
+});
+
 router.get('/:id/edit', (req, res) => {
   const customer = db.prepare('SELECT * FROM customers WHERE id = ?').get(req.params.id);
   if (!customer) return res.status(404).send('Customer not found');