Persist learn progress per user

server/api/learn/state.get.ts

@@ -0,0 +1,24 @@
+import { requireUserSession } from '../../utils/auth'
+import { LearnProfile } from '../../models/LearnProfile'
+import { createDefaultLearnConfig, createDefaultLearnState } from '~~/shared/learn/config'
+
+export default defineEventHandler(async (event) => {
+  const user = await requireUserSession(event)
+  const profile = await LearnProfile.findOne({ user: user._id })
+
+  if (!profile) {
+    return createDefaultLearnState()
+  }
+
+  const config = { ...createDefaultLearnConfig(), ...(profile.config || {}) }
+  const progress =
+    profile.progress && typeof profile.progress === 'object'
+      ? JSON.parse(JSON.stringify(profile.progress))
+      : {}
+
+  return {
+    xp: typeof profile.xp === 'number' ? profile.xp : 0,
+    progress,
+    config,
+  }
+})