feat: enable assignee selection when creating tickets

Co-authored-by: factory-droid[bot] <138933559+factory-droid[bot]@users.noreply.github.com>

web/convex/users.ts

@@ -1,5 +1,8 @@
 import { mutation, query } from "./_generated/server";
-import { v } from "convex/values";
+import { ConvexError, v } from "convex/values";
+import { requireAdmin } from "./rbac";
+
+const STAFF_ROLES = new Set(["ADMIN", "MANAGER", "AGENT", "COLLABORATOR"]);
 
 export const ensureUser = mutation({
   args: {
@@ -69,11 +72,41 @@ export const ensureUser = mutation({
 export const listAgents = query({
   args: { tenantId: v.string() },
   handler: async (ctx, { tenantId }) => {
-    const agents = await ctx.db
+    const users = await ctx.db
       .query("users")
-      .withIndex("by_tenant_role", (q) => q.eq("tenantId", tenantId).eq("role", "AGENT"))
+      .withIndex("by_tenant", (q) => q.eq("tenantId", tenantId))
       .collect();
-    return agents;
+
+    return users
+      .filter((user) => {
+        const normalizedRole = (user.role ?? "AGENT").toUpperCase();
+        return STAFF_ROLES.has(normalizedRole);
+      })
+      .sort((a, b) => a.name.localeCompare(b.name, "pt-BR"));
+  },
+});
+
+export const deleteUser = mutation({
+  args: { userId: v.id("users"), actorId: v.id("users") },
+  handler: async (ctx, { userId, actorId }) => {
+    const user = await ctx.db.get(userId);
+    if (!user) {
+      return { status: "not_found" };
+    }
+
+    await requireAdmin(ctx, actorId, user.tenantId);
+
+    const assignedTickets = await ctx.db
+      .query("tickets")
+      .withIndex("by_tenant_assignee", (q) => q.eq("tenantId", user.tenantId).eq("assigneeId", userId))
+      .take(1);
+
+    if (assignedTickets.length > 0) {
+      throw new ConvexError("Usuário ainda está atribuído a tickets");
+    }
+
+    await ctx.db.delete(userId);
+    return { status: "deleted" };
   },
 });