Signup: require a display name (changeable later), remove skip

Per request, a display name is now mandatory when signing up:
- Removed the "Skip for now" button from the profile step — the only forward
  path is Save, which is disabled until a non-empty name is entered.
- Marked the field required (*), added helper copy ("Required — how you'll show
  up across SkateSpots. Change it anytime."), and a hint under the button.
- finishSignup guards against an empty/whitespace name (defense-in-depth for
  keyboard/Enter), trims the name before publishing kind 0.
- Reworded the step copy: name required, bio + avatar still optional.

Only affects the primary nsec signup dialog (also the endpoint the mnemonic
flow feeds into); the mnemonic dialog has no name step.

Co-authored-by: shakespeare.diy <assistant@shakespeare.diy>

src/components/auth/SignupDialog.tsx

@@ -152,14 +152,26 @@ const SignupDialog: React.FC<SignupDialogProps> = ({ isOpen, onClose, onComplete
   };
 
   const finishSignup = async (skipProfile = false) => {
+    // A display name is mandatory (changeable later). Guard here too so the step
+    // can't be completed without one, even via keyboard/Enter.
+    const trimmedName = profileData.name.trim();
+    if (!skipProfile && !trimmedName) {
+      toast({
+        title: 'Display name required',
+        description: 'Pick a display name so other skaters know who you are. You can change it anytime.',
+        variant: 'destructive',
+      });
+      return;
+    }
+
     // Mark signup completion time for fallback welcome modal
     localStorage.setItem('signup_completed', Date.now().toString());
 
     try {
       // Publish profile if user provided information
-      if (!skipProfile && (profileData.name || profileData.about || profileData.picture)) {
+      if (!skipProfile && (trimmedName || profileData.about || profileData.picture)) {
         const metadata: Record<string, string> = {};
-        if (profileData.name) metadata.name = profileData.name;
+        if (trimmedName) metadata.name = trimmedName;
         if (profileData.about) metadata.about = profileData.about;
         if (profileData.picture) metadata.picture = profileData.picture;
 
@@ -365,11 +377,11 @@ const SignupDialog: React.FC<SignupDialogProps> = ({ isOpen, onClose, onComplete
 
                 <div className='relative z-10 space-y-2'>
                   <p className='text-base font-semibold'>
-                    You're in! 🛹 Add a name so skaters know who you are
+                    You're in! 🛹 Pick a display name so skaters know who you are
                   </p>
 
                   <p className='text-sm text-muted-foreground'>
-                    This is optional — you can skip it and fill it in later.
+                    You can change it anytime later. Bio and avatar are optional.
                   </p>
                 </div>
               </div>
@@ -390,16 +402,22 @@ const SignupDialog: React.FC<SignupDialogProps> = ({ isOpen, onClose, onComplete
               <div className={`space-y-4 text-left ${isPublishing ? 'opacity-50 pointer-events-none' : ''}`}>
                 <div className='space-y-2'>
                   <label htmlFor='profile-name' className='text-sm font-medium'>
-                    Display Name
+                    Display Name <span className='text-red-500'>*</span>
                   </label>
                   <Input
                     id='profile-name'
                     value={profileData.name}
                     onChange={(e) => setProfileData(prev => ({ ...prev, name: e.target.value }))}
-                    placeholder='Your name'
+                    placeholder='e.g. Tony, gnarlyGrind, or your crew name'
                     className='rounded-lg'
+                    maxLength={64}
+                    required
+                    aria-required='true'
                     disabled={isPublishing}
                   />
+                  <p className='text-xs text-muted-foreground'>
+                    Required — how you'll show up across SkateSpots. Change it anytime.
+                  </p>
                 </div>
 
                 <div className='space-y-2'>
@@ -456,12 +474,12 @@ const SignupDialog: React.FC<SignupDialogProps> = ({ isOpen, onClose, onComplete
                 </div>
               </div>
 
-              {/* Action buttons */}
+              {/* Action button — a display name is required to continue. */}
               <div className='space-y-3'>
                 <Button
-                  className='w-full rounded-full py-4 text-base font-semibold bg-gradient-to-r from-blue-600 to-indigo-600 hover:from-blue-700 hover:to-indigo-700 transform transition-all duration-200 hover:scale-105 shadow-lg disabled:opacity-50 disabled:cursor-not-allowed disabled:transform-none'
+                  className='w-full rounded-full py-4 text-base font-semibold bg-gradient-to-r from-blue-600 to-indigo-600 hover:from-blue-700 hover:to-indigo-700 transform transition-all duration-200 hover:scale-105 shadow-lg disabled:opacity-50 disabled:cursor-not-allowed disabled:transform-none disabled:hover:scale-100'
                   onClick={() => finishSignup(false)}
-                  disabled={isPublishing || isUploading}
+                  disabled={isPublishing || isUploading || !profileData.name.trim()}
                 >
                   {isPublishing ? (
                     <>
@@ -476,21 +494,11 @@ const SignupDialog: React.FC<SignupDialogProps> = ({ isOpen, onClose, onComplete
                   )}
                 </Button>
 
-                <Button
+                {!profileData.name.trim() && !isPublishing && (
-                  variant='outline'
+                  <p className='text-center text-xs text-muted-foreground'>
-                  className='w-full rounded-full py-3 disabled:opacity-50 disabled:cursor-not-allowed'
+                    Add a display name to continue.
-                  onClick={() => finishSignup(true)}
+                  </p>
-                  disabled={isPublishing || isUploading}
+                )}
-                >
-                  {isPublishing ? (
-                    <>
-                      <div className='w-4 h-4 mr-2 border-2 border-current border-t-transparent rounded-full animate-spin' />
-                      Setting up account...
-                    </>
-                  ) : (
-                    'Skip for now'
-                  )}
-                </Button>
               </div>
             </div>
           )}