Neon / portal template support (#713)

TODOs:
- [x] Do restart when checkout / restore if there is a DB
- [x] List all branches (branch id, name, date)
- [x] Allow checking out versions with no DB
- [x] safeguard to never delete main branches
- [x] create app hook for neon template
- [x] weird UX with connector on configure panel
- [x] tiny neon logo in connector
- [x] deploy to vercel
- [x] build forgot password page
- [x] what about email setup
- [x] lots of imgix errors
- [x] edit file - db snapshot
- [x] DYAD_DISABLE_DB_PUSH
- [ ] update portal doc
- [x] switch preview branch to be read-only endpoint
- [x] disable supabase sys prompt if neon is enabled
- [ ] https://payloadcms.com/docs/upload/storage-adapters
- [x] need to use main branch...

Phase 2?
- [x] generate DB migrations

src/lib/schemas.ts

@@ -90,6 +90,14 @@ export const SupabaseSchema = z.object({
 });
 export type Supabase = z.infer<typeof SupabaseSchema>;
 
+export const NeonSchema = z.object({
+  accessToken: SecretSchema.optional(),
+  refreshToken: SecretSchema.optional(),
+  expiresIn: z.number().optional(),
+  tokenTimestamp: z.number().optional(),
+});
+export type Neon = z.infer<typeof NeonSchema>;
+
 export const ExperimentsSchema = z.object({
   // Deprecated
   enableSupabaseIntegration: z.boolean().describe("DEPRECATED").optional(),
@@ -138,6 +146,7 @@ export const UserSettingsSchema = z.object({
   githubAccessToken: SecretSchema.optional(),
   vercelAccessToken: SecretSchema.optional(),
   supabase: SupabaseSchema.optional(),
+  neon: NeonSchema.optional(),
   autoApproveChanges: z.boolean().optional(),
   telemetryConsent: z.enum(["opted_in", "opted_out", "unset"]).optional(),
   telemetryUserId: z.string().optional(),

src/lib/toast.tsx

@@ -2,6 +2,7 @@ import { toast } from "sonner";
 import { PostHog } from "posthog-js";
 import React from "react";
 import { CustomErrorToast } from "../components/CustomErrorToast";
+import { InputRequestToast } from "../components/InputRequestToast";
 
 /**
  * Toast utility functions for consistent notifications across the app
@@ -87,6 +88,29 @@ export const showInfo = (message: string) => {
   toast.info(message);
 };
 
+/**
+ * Show an input request toast for interactive prompts (y/n)
+ * @param message The prompt message to display
+ * @param onResponse Callback function called when user responds
+ */
+export const showInputRequest = (
+  message: string,
+  onResponse: (response: "y" | "n") => void,
+) => {
+  const toastId = toast.custom(
+    (t) => (
+      <InputRequestToast
+        message={message}
+        toastId={t}
+        onResponse={onResponse}
+      />
+    ),
+    { duration: Infinity }, // Don't auto-close
+  );
+
+  return toastId;
+};
+
 export const showExtraFilesToast = ({
   files,
   error,