refactor: remove username from User model, login by email only

tests/unit/actions/user.actions.test.ts

@@ -50,7 +50,6 @@ describe("user actions localization", () => {
   describe("createUserAction", () => {
     it("returns localized schema validation errors for invalid create input", async () => {
       const result = await createUserAction({
-        username: "",
         name: "",
         email: "bad",
         password: "short",
@@ -63,7 +62,6 @@ describe("user actions localization", () => {
       expect(result).toEqual({
         success: false,
         errors: {
-          username: [es.admin.users.schema.usernameRequired],
           name: [es.admin.users.schema.nameRequired],
           email: [es.admin.users.schema.emailInvalid],
           password: [es.admin.users.schema.passwordMinLength],
@@ -75,13 +73,11 @@ describe("user actions localization", () => {
       mocks.createUserUseCase.mockResolvedValue({
         success: false,
         errors: {
-          username: ["Username already exists"],
           email: ["Email already exists"],
         },
       })
 
       const result = await createUserAction({
-        username: "ada",
         name: "Ada",
         email: "ada@example.test",
         password: "password1",
@@ -92,7 +88,6 @@ describe("user actions localization", () => {
       expect(result).toEqual({
         success: false,
         errors: {
-          username: [es.admin.users.actions.duplicateUsername],
           email: [es.admin.users.actions.duplicateEmail],
         },
         message: es.admin.users.actions.createFailure,
@@ -103,7 +98,6 @@ describe("user actions localization", () => {
       mocks.createUserUseCase.mockResolvedValue({ success: true })
 
       const result = await createUserAction({
-        username: "ada",
         name: "Ada",
         email: "ada@example.test",
         password: "password1",
@@ -123,7 +117,6 @@ describe("user actions localization", () => {
     it("returns localized schema validation errors for invalid update input", async () => {
       const result = await updateUserAction({
         id: "",
-        username: "",
         name: "",
         email: "bad",
         role: "ADMIN",
@@ -136,7 +129,6 @@ describe("user actions localization", () => {
         success: false,
         errors: {
           id: [es.admin.users.schema.userIdRequired],
-          username: [es.admin.users.schema.usernameRequired],
           name: [es.admin.users.schema.nameRequired],
           email: [es.admin.users.schema.emailInvalid],
         },
@@ -156,7 +148,6 @@ describe("user actions localization", () => {
 
       const result = await updateUserAction({
         id: "user-1",
-        username: "admin",
         name: "Admin",
         email: "admin@example.test",
         role: "MANAGER",
@@ -180,7 +171,6 @@ describe("user actions localization", () => {
 
       const result = await updateUserAction({
         id: "user-1",
-        username: "admin",
         name: "Admin",
         email: "admin@example.test",
         role: "ADMIN",

tests/unit/actions/user.messages.test.ts

@@ -6,11 +6,10 @@ import { es } from "@/i18n/dictionaries/es"
 const actionCopy = es.admin.users.actions
 
 describe("user action message localization", () => {
-  it("localizes all 6 known use-case error strings to dictionary keys", () => {
+  it("localizes all 5 known use-case error strings to dictionary keys", () => {
     expect(
       localizeUserFieldErrors(
         {
-          username: ["Username already exists"],
           email: ["Email already exists"],
           id: [
             "User not found",
@@ -22,7 +21,6 @@ describe("user action message localization", () => {
         actionCopy,
       ),
     ).toEqual({
-      username: [actionCopy.duplicateUsername],
       email: [actionCopy.duplicateEmail],
       id: [
         actionCopy.notFound,