trans-history: concepto multiidioma (helper de concepto compartido)

Extrae la lógica de concepto traducible a lib/tx-concept.ts (buildConcept +
purchasedPD + SERVICE_CONCEPT) y la reutilizan points-history y trans-history.
La columna Concepto de trans-history ahora se traduce (reusa History.points.concept.*)
en vez de mostrar el product_name en español. Corrige también la sombra de
variable en PlatformBox (map t -> tx). Verificado con la cuenta 15.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

web-next/lib/trans-history.ts

@@ -1,5 +1,6 @@
 import type { RowDataPacket } from 'mysql2'
 import { db, DB } from './db'
+import { buildConcept } from './tx-concept'
 
 /** Una transacción de pago (Stripe o SumUp) registrada en home_stripelog. */
 export interface PaymentTx {
@@ -8,7 +9,10 @@ export interface PaymentTx {
   status: 'PAID' | 'PENDING'
   createdAt: Date
   amount: number // importe en €
-  concept: string
+  // Concepto traducible (clave + args) con reserva de texto libre.
+  conceptKey: string | null
+  conceptArgs: Record<string, string | number>
+  conceptRaw: string
 }
 
 /**
@@ -20,18 +24,28 @@ export async function getPaymentTransactions(accountId: number, limit = 200): Pr
   if (!accountId) return []
   try {
     const [rows] = await db(DB.default).query<RowDataPacket[]>(
-      "SELECT session_id, product_name, amount, mode, fulfilled, timestamp FROM home_stripelog " +
+      'SELECT session_id, product_name, character_name, amount, mode, service, metadata, fulfilled, timestamp FROM home_stripelog ' +
         "WHERE account_id = ? AND mode IN ('sumup', 'test', 'live') ORDER BY timestamp DESC LIMIT ?",
       [accountId, limit],
     )
-    return rows.map((r) => ({
-      id: String(r.session_id || ''),
-      platform: r.mode === 'sumup' ? 'SumUp' : 'Stripe',
-      status: r.fulfilled ? 'PAID' : 'PENDING',
-      createdAt: new Date(r.timestamp),
-      amount: Number(r.amount),
-      concept: String(r.product_name || '—'),
-    }))
+    return rows.map((r) => {
+      const c = buildConcept(
+        String(r.product_name || '—'),
+        r.service ? String(r.service) : null,
+        String(r.character_name || ''),
+        r.metadata ? String(r.metadata) : null,
+      )
+      return {
+        id: String(r.session_id || ''),
+        platform: r.mode === 'sumup' ? 'SumUp' : 'Stripe',
+        status: r.fulfilled ? 'PAID' : 'PENDING',
+        createdAt: new Date(r.timestamp),
+        amount: Number(r.amount),
+        conceptKey: c.conceptKey,
+        conceptArgs: c.conceptArgs,
+        conceptRaw: c.conceptRaw,
+      }
+    })
   } catch {
     return []
   }