Return a string description in market API

docs/docs/api.md

@@ -113,7 +113,8 @@ Requires no authorization.
     // Market attributes. All times are in milliseconds since epoch
     closeTime?: number // Min of creator's chosen date, and resolutionTime
     question: string
-    description: string
+    description: JSONContent // Rich text content. See https://tiptap.dev/guide/output#option-1-json
+    textDescription: string // string description without formatting, images, or embeds
 
     // A list of tags on each market. Any user can add tags to any market.
     // This list also includes the predefined categories shown as filters on the home page.

web/pages/api/v0/_types.ts

@@ -7,6 +7,7 @@ import { User } from 'common/user'
 import { removeUndefinedProps } from 'common/util/object'
 import { ENV_CONFIG } from 'common/envs/constants'
 import { JSONContent } from '@tiptap/core'
+import { richTextToString } from 'common/lib/util/parse'
 
 export type LiteMarket = {
   // Unique identifer for this market
@@ -22,6 +23,7 @@ export type LiteMarket = {
   closeTime?: number
   question: string
   description: string | JSONContent
+  textDescription: string // string version of description
   tags: string[]
   url: string
   outcomeType: string
@@ -117,6 +119,10 @@ export function toLiteMarket(contract: Contract): LiteMarket {
         : closeTime,
     question,
     description,
+    textDescription:
+      typeof description === 'string'
+        ? description
+        : richTextToString(description),
     tags,
     url: `https://manifold.markets/${creatorUsername}/${slug}`,
     pool,