Swipe gesture on the Discover deck (#107)

Co-authored-by: orchestrator-agent <20+orchestrator-agent@code.cubecraftcreations.com>

web/src/discover/DeckCard.tsx

@@ -1,3 +1,4 @@
+import type { DOMAttributes } from 'react'
 import { DIFFICULTIES, type Difficulty } from '../dinners/api.ts'
 import { Photo } from '../ui/Photo.tsx'
 import type { SideQuest } from './api.ts'
@@ -8,25 +9,35 @@ export const DECK_DEPTH = [0, 1, 2] as const
 
 const DIFFICULTY_LABEL: Record<Difficulty, string> = { easy: 'Easy', medium: 'Medium', hard: 'Hard' }
 
+// SwipeHandlers are the pointer handlers that drag the top card.
+export type SwipeHandlers = Pick<
+  DOMAttributes<HTMLElement>,
+  'onPointerDown' | 'onPointerMove' | 'onPointerUp' | 'onPointerCancel' | 'onLostPointerCapture'
+>
+
 export type DeckCardProps = {
   quest: SideQuest
   // 0 is the top card; 1 and 2 stack behind it.
   depth: number
+  // swipe makes the card draggable; only the top card gets it.
+  swipe?: SwipeHandlers
 }
 
 // DeckCard is one Side quest in the deck. Only the top card is read out and
 // reachable; the cards behind it are the stack's edge, kept rendered so they
 // can be promoted. Its "Try it!" and "Pass" stamps stay hidden until a
-// decision shows them, and its shade until Pass folds it (see motion.ts).
-export function DeckCard({ quest, depth }: DeckCardProps) {
+// decision or a drag shows them, and its shade until Pass folds it (see
+// motion.ts).
+export function DeckCard({ quest, depth, swipe }: DeckCardProps) {
   const top = depth === 0
   const titleId = `side-quest-${quest.id}`
   return (
     <article
-      className={`${styles.card} ${styles[`depth${depth}`]}`}
+      className={`${styles.card} ${styles[`depth${depth}`]}${swipe === undefined ? '' : ` ${styles.draggable}`}`}
       aria-labelledby={top ? titleId : undefined}
       aria-hidden={top ? undefined : true}
       inert={!top}
+      {...swipe}
     >
       <Photo id={quest.photo_id} name={quest.name} radius="24px" inset="10px" sizes="400px" className={styles.photo} />
       <div className={styles.content}>
@@ -41,7 +52,7 @@ export function DeckCard({ quest, depth }: DeckCardProps) {
       <span className={`${styles.stamp} ${styles.tryStamp}`} data-part="try-stamp" aria-hidden="true">
         Try it!
       </span>
-      <span className={`${styles.stamp} ${styles.passStamp}`} aria-hidden="true">
+      <span className={`${styles.stamp} ${styles.passStamp}`} data-part="pass-stamp" aria-hidden="true">
         Pass
       </span>
       <span className={styles.shade} data-part="shade" />