feat(tickets): Play e Chat atribuem responsavel automaticamente

- Botao Play habilitado mesmo sem responsavel
- Ao clicar Play sem responsavel, atribui usuario logado automaticamente
- Ao iniciar chat ao vivo sem responsavel, atribui usuario logado
- Adiciona mutation fixLegacySessions para corrigir sessoes antigas

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

convex/liveChat.ts

@@ -896,6 +896,47 @@ export const autoEndInactiveSessions = mutation({
   },
 })
 
+// Mutation para corrigir sessoes antigas sem campos obrigatorios
+export const fixLegacySessions = mutation({
+  args: {},
+  handler: async (ctx) => {
+    const now = Date.now()
+
+    // Buscar sessoes ativas que podem ter campos faltando
+    const activeSessions = await ctx.db
+      .query("liveChatSessions")
+      .withIndex("by_status_lastActivity", (q) => q.eq("status", "ACTIVE"))
+      .take(100)
+
+    let fixed = 0
+    let ended = 0
+
+    for (const session of activeSessions) {
+      // Se sessao nao tem lastAgentMessageAt, adiciona o valor de startedAt
+      if (session.lastAgentMessageAt === undefined) {
+        // Sessao muito antiga (mais de 24h) - encerrar
+        if (now - session.startedAt > 24 * 60 * 60 * 1000) {
+          await ctx.db.patch(session._id, {
+            status: "ENDED",
+            endedAt: now,
+            lastAgentMessageAt: session.lastActivityAt ?? session.startedAt,
+          })
+          ended++
+        } else {
+          // Sessao recente - apenas corrigir o campo
+          await ctx.db.patch(session._id, {
+            lastAgentMessageAt: session.lastActivityAt ?? session.startedAt,
+          })
+          fixed++
+        }
+      }
+    }
+
+    console.log(`fixLegacySessions: fixed=${fixed}, ended=${ended}`)
+    return { fixed, ended, total: activeSessions.length }
+  },
+})
+
 // ============================================
 // UPLOAD DE ARQUIVOS (Maquina/Cliente)
 // ============================================