feat: use server-actions for authoring flow

This change actually makes the authoring flow work for
the most part by tying in emailing and more.

We have also done a number of quality of life updates to
simplify the codebase overall making it easier to continue
work on the refresh.

packages/email/mailer.ts

@@ -0,0 +1,50 @@
+import { createTransport } from 'nodemailer';
+
+import { MailChannelsTransport } from './transports/mailchannels';
+
+const getTransport = () => {
+  const transport = process.env.NEXT_PRIVATE_SMTP_TRANSPORT ?? 'smtp-auth';
+
+  if (transport === 'mailchannels') {
+    return createTransport(
+      MailChannelsTransport.makeTransport({
+        apiKey: process.env.NEXT_PRIVATE_MAILCHANNELS_API_KEY,
+        endpoint: process.env.NEXT_PRIVATE_MAILCHANNELS_ENDPOINT,
+      }),
+    );
+  }
+
+  if (transport === 'smtp-api') {
+    if (!process.env.NEXT_PRIVATE_SMTP_HOST || !process.env.NEXT_PRIVATE_SMTP_APIKEY) {
+      throw new Error(
+        'SMTP API transport requires NEXT_PRIVATE_SMTP_HOST and NEXT_PRIVATE_SMTP_APIKEY',
+      );
+    }
+
+    return createTransport({
+      host: process.env.NEXT_PRIVATE_SMTP_HOST,
+      port: Number(process.env.NEXT_PRIVATE_SMTP_PORT) || 587,
+      secure: process.env.NEXT_PRIVATE_SMTP_SECURE === 'true',
+      auth: {
+        user: process.env.NEXT_PRIVATE_SMTP_APIKEY_USER ?? 'apikey',
+        pass: process.env.NEXT_PRIVATE_SMTP_APIKEY ?? '',
+      },
+    });
+  }
+
+  if (!process.env.NEXT_PRIVATE_SMTP_HOST) {
+    throw new Error('SMTP transport requires NEXT_PRIVATE_SMTP_HOST');
+  }
+
+  return createTransport({
+    host: process.env.NEXT_PRIVATE_SMTP_HOST,
+    port: Number(process.env.NEXT_PRIVATE_SMTP_PORT) || 587,
+    secure: process.env.NEXT_PRIVATE_SMTP_SECURE === 'true',
+    auth: {
+      user: process.env.NEXT_PRIVATE_SMTP_USERNAME ?? '',
+      pass: process.env.NEXT_PRIVATE_SMTP_PASSWORD ?? '',
+    },
+  });
+};
+
+export const mailer = getTransport();