fix: remove an unused feat

backend/auth.go

@@ -232,43 +232,6 @@ func getMe(c echo.Context) error {
 	})
 }
 
-func updateUsername(c echo.Context) error {
-	uid := c.Get("user_id").(uint)
-	type Req struct {
-		Username string `json:"username"`
-	}
-	r := new(Req)
-	if err := c.Bind(r); err != nil {
-		return echo.NewHTTPError(http.StatusBadRequest, "Invalid request")
-	}
-
-	r.Username = strings.TrimSpace(r.Username)
-	if len(r.Username) < 3 || len(r.Username) > 32 {
-		return echo.NewHTTPError(http.StatusBadRequest, "Username must be 3–32 characters")
-	}
-
-	// Check if username is already taken by another user
-	var existing User
-	if db.Where("username = ? AND id != ?", r.Username, uid).First(&existing).Error == nil {
-		return echo.NewHTTPError(http.StatusConflict, "Username already taken")
-	}
-
-	var user User
-	if err := db.First(&user, uid).Error; err != nil {
-		return echo.NewHTTPError(http.StatusNotFound, "User not found")
-	}
-
-	user.Username = r.Username
-	if err := db.Save(&user).Error; err != nil {
-		return echo.NewHTTPError(http.StatusInternalServerError, "Failed to update username")
-	}
-
-	return c.JSON(http.StatusOK, map[string]interface{}{
-		"id":       user.ID,
-		"username": user.Username,
-	})
-}
-
 func updatePassword(c echo.Context) error {
 	uid := c.Get("user_id").(uint)
 	type Req struct {

backend/main.go

@@ -45,7 +45,6 @@ func main() {
 	// User account management
 	user := e.Group("/user", JWTMiddleware)
 	user.GET("/stats", getUserStats)
-	user.PUT("/username", updateUsername)
 	user.PUT("/password", updatePassword)
 	user.DELETE("/account", deleteAccount)
 

frontend/src/pages/User.tsx

@@ -2,7 +2,7 @@ import { useState, useEffect } from 'react';
 import { useNavigate } from 'react-router-dom';
 import { useAuth } from '../context/AuthContext';
 import api from '../lib/api';
-import { MdPerson, MdLock, MdDelete, MdSave, MdBarChart } from 'react-icons/md';
+import { MdLock, MdDelete, MdSave, MdBarChart } from 'react-icons/md';
 
 interface UserStats {
   link_count: number;
@@ -18,10 +18,6 @@ export default function User() {
   const [error, setError] = useState('');
   const [success, setSuccess] = useState('');
 
-  // Username update
-  const [newUsername, setNewUsername] = useState('');
-  const [updatingUsername, setUpdatingUsername] = useState(false);
-
   // Password update
   const [currentPassword, setCurrentPassword] = useState('');
   const [newPassword, setNewPassword] = useState('');
@@ -39,7 +35,6 @@ export default function User() {
 
   useEffect(() => {
     if (user) {
-      setNewUsername(user.username);
       fetchStats();
     }
   }, [user]);
@@ -55,23 +50,6 @@ export default function User() {
     }
   };
 
-  const handleUpdateUsername = async (e: React.FormEvent) => {
-    e.preventDefault();
-    setError('');
-    setSuccess('');
-    setUpdatingUsername(true);
-
-    try {
-      setSuccess('Username updated successfully');
-      // Update the user in context would require refetching /auth/me
-      window.location.reload(); // Simple way to update context
-    } catch (err: any) {
-      setError(err.response?.data?.message || 'Failed to update username');
-    } finally {
-      setUpdatingUsername(false);
-    }
-  };
-
   const handleUpdatePassword = async (e: React.FormEvent) => {
     e.preventDefault();
     setError('');
@@ -121,7 +99,7 @@ export default function User() {
 
   return (
     <div className="min-h-screen pt-20 pb-12 px-4">
-      <div className="max-w-2xl mx-auto">
+      <div className="max-w-md mx-auto">
         {/* Header */}
         <h1 className="text-2xl font-bold tracking-widest text-zinc-100 uppercase mb-8">
           Account Settings
@@ -157,37 +135,6 @@ export default function User() {
           </div>
         </div>
 
-        {/* Update Username */}
-        <div className="bg-zinc-900 border border-zinc-800 p-6 mb-6">
-          <div className="flex items-center gap-2 mb-4">
-            <MdPerson size={20} className="text-zinc-400" />
-            <h2 className="text-sm font-bold tracking-widest text-zinc-100 uppercase">Username</h2>
-          </div>
-          <form onSubmit={handleUpdateUsername} className="space-y-4">
-            <div>
-              <label className="block text-xs font-mono uppercase tracking-wide text-zinc-400 mb-2">
-                New Username
-              </label>
-              <input
-                type="text"
-                value={newUsername}
-                onChange={(e) => setNewUsername(e.target.value)}
-                className="w-full bg-zinc-950 border border-zinc-800 px-4 py-2 text-zinc-100 text-sm focus:outline-none focus:border-zinc-600"
-                required
-                minLength={3}
-                maxLength={32}
-              />
-            </div>
-            <button
-              type="submit"
-              disabled={updatingUsername || newUsername === user?.username}
-              className="flex items-center gap-2 bg-zinc-200 text-zinc-900 px-4 py-2 text-xs font-bold uppercase tracking-widest hover:bg-white transition-colors disabled:opacity-50 disabled:cursor-not-allowed"
-            >
-              <MdSave size={16} /> Update Username
-            </button>
-          </form>
-        </div>
-
         {/* Update Password */}
         <div className="bg-zinc-900 border border-zinc-800 p-6 mb-6">
           <div className="flex items-center gap-2 mb-4">