feat: implement nsec login functionality in AuthModal

- Added a new nsec login option that allows users to sign in using their private key.
- Introduced a toggle to reveal the nsec input field, enhancing user experience.
- Implemented validation and error handling for nsec submissions, ensuring robust login flow.
- Updated styles and layout for better visual consistency and usability.

These changes enhance the authentication process by providing an additional secure login method for users.

src/components/AuthModal.vue

@@ -49,26 +49,16 @@
               <div v-if="mode === 'login'" class="text-right">
                 <span class="text-sm text-white/60">Forgot password?</span>
               </div>
-              <button type="submit" class="hero-play-button w-full flex items-center justify-center">
+              <button type="submit" class="hero-play-button w-full flex items-center justify-center mb-4">
                 <span>{{ mode === 'register' ? 'Create Account' : 'Sign In' }}</span>
               </button>
             </form>
 
-            <!-- Divider -->
-            <div class="relative my-6">
-              <div class="absolute inset-0 flex items-center">
-                <div class="w-full border-t border-white/10"></div>
-              </div>
-              <div class="relative flex justify-center text-sm">
-                <span class="px-4 bg-transparent text-white/40">or</span>
-              </div>
-            </div>
-
             <!-- Nostr Login Button (NIP-07 Browser Extension) -->
             <button
               @click="handleNostrLogin"
               :disabled="isLoading"
-              class="nostr-login-button w-full flex items-center justify-center gap-2"
+              class="nostr-login-button w-full flex items-center justify-center gap-2 mt-4"
             >
               <svg class="w-5 h-5" fill="none" stroke="currentColor" viewBox="0 0 24 24">
                 <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M15 7a2 2 0 012 2m4 0a6 6 0 01-7.743 5.743L11 17H9v2H7v2H4a1 1 0 01-1-1v-2.586a1 1 0 01.293-.707l5.964-5.964A6 6 0 1121 9z" />
@@ -76,17 +66,50 @@
               Sign in with Nostr Extension
             </button>
 
-            <!-- Divider between Nostr methods -->
+            <!-- nsec login (hidden by default; tap to reveal field) -->
-            <div class="relative my-4">
+            <template v-if="!showNsecField">
-              <div class="absolute inset-0 flex items-center">
+              <button
-                <div class="w-full border-t border-white/10"></div>
+                type="button"
-              </div>
+                @click="showNsecField = true"
-              <div class="relative flex justify-center text-sm">
+                :disabled="isLoading"
-                <span class="px-4 bg-transparent text-white/30 text-xs">or</span>
+                class="nostr-login-button w-full flex items-center justify-center gap-2 mt-6"
+              >
+                <svg class="w-5 h-5" fill="none" stroke="currentColor" viewBox="0 0 24 24">
+                  <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M12 15v2m-6 4h12a2 2 0 002-2v-6a2 2 0 00-2-2H6a2 2 0 00-2 2v6a2 2 0 002 2zm10-10V7a4 4 0 00-8 0v4h8z" />
+                </svg>
+                Sign in with nsec (private key)
+              </button>
+            </template>
+            <div v-else class="nsec-field-block mt-6">
+              <input
+                v-model="nsecInput"
+                type="password"
+                placeholder="nsec1..."
+                class="auth-input w-full"
+                autocomplete="off"
+              />
+              <div class="nsec-actions">
+                <button
+                  type="button"
+                  @click="handleNsecSubmit"
+                  :disabled="!nsecInput.trim() || isLoading"
+                  class="nostr-login-button flex-1 flex items-center justify-center gap-2"
+                  :class="{ 'opacity-40 cursor-not-allowed': !nsecInput.trim() || isLoading }"
+                >
+                  Sign in
+                </button>
+                <button
+                  type="button"
+                  @click="cancelNsecField"
+                  class="nsec-cancel-btn"
+                >
+                  Cancel
+                </button>
               </div>
             </div>
 
-            <!-- Amber Login (NIP-55 Android Signer) -->
+            <!-- Amber Login (hidden for now — re-enable by changing v-if to amberPhase === 'idle') -->
+            <template v-if="false">
             <button
               v-if="amberPhase === 'idle'"
               @click="handleAmberOpen"
@@ -99,8 +122,6 @@
               </svg>
               Sign in with Amber
             </button>
-
-            <!-- Waiting for pubkey from Amber (auto-detects on return) -->
             <div v-else-if="amberPhase === 'waiting-pubkey'" class="mt-3 space-y-3">
               <div class="flex items-center justify-center gap-2 text-sm text-[#F7931A]">
                 <svg class="w-4 h-4 animate-spin" fill="none" viewBox="0 0 24 24">
@@ -180,7 +201,6 @@
               </button>
             </div>
 
-            <!-- Completing sign-in -->
             <div v-else-if="amberPhase === 'completing'" class="mt-3">
               <div class="flex items-center justify-center gap-2 text-sm text-[#F7931A]">
                 <svg class="w-4 h-4 animate-spin" fill="none" viewBox="0 0 24 24">
@@ -190,6 +210,7 @@
                 <span>Completing sign-in...</span>
               </div>
             </div>
+            </template>
 
             <!-- Toggle Mode -->
             <div class="mt-6 text-center text-sm text-white/60">
@@ -291,13 +312,17 @@ const props = withDefaults(defineProps<Props>(), {
 const emit = defineEmits<Emits>()
 
 const { loginWithNostr, isLoading: authLoading } = useAuth()
-const { loginWithExtension } = useAccounts()
+const { loginWithExtension, loginWithPrivateKey } = useAccounts()
 
 const mode = ref<'login' | 'register' | 'forgot'>(props.defaultMode)
 const errorMessage = ref<string | null>(null)
 const isLoading = computed(() => authLoading.value || sovereignGenerating.value)
 
-// Amber login state
+// nsec login (tap to reveal field)
+const showNsecField = ref(false)
+const nsecInput = ref('')
+
+// Amber login state (hidden for now)
 const amberPhase = ref<'idle' | 'waiting-pubkey' | 'waiting-signature' | 'completing'>('idle')
 const amberPubkey = ref<string | null>(null)
 const amberUnsignedEvent = ref<any>(null)
@@ -322,6 +347,8 @@ watch(() => props.isOpen, (open) => {
     sovereignDismissed.value = false
     generatedKeys.value = null
     errorMessage.value = null
+    showNsecField.value = false
+    nsecInput.value = ''
     cancelAmber()
   }
 })
@@ -471,6 +498,33 @@ async function handleNostrLogin() {
   }
 }
 
+function cancelNsecField() {
+  showNsecField.value = false
+  nsecInput.value = ''
+  errorMessage.value = null
+}
+
+/**
+ * Sign in with pasted nsec. Adds account, sets active, then creates backend session.
+ */
+async function handleNsecSubmit() {
+  const nsec = nsecInput.value.trim()
+  if (!nsec) return
+  errorMessage.value = null
+  try {
+    await loginWithPrivateKey(nsec)
+    const account = accountManager.active
+    if (!account) throw new Error('Account not set')
+    await loginWithNostr(account.pubkey, 'nsec', {}, undefined)
+    nsecInput.value = ''
+    showNsecField.value = false
+    emit('success')
+    closeModal()
+  } catch (err: any) {
+    errorMessage.value = err.message || 'Invalid nsec or sign-in failed.'
+  }
+}
+
 /**
  * Clean up Amber flow state, timers, and event listeners.
  */
@@ -809,6 +863,42 @@ declare global {
   color: rgba(255, 255, 255, 0.3);
 }
 
+/* nsec login field block */
+.nsec-field-block {
+  padding: 0.5rem 0;
+}
+.nsec-hint {
+  font-size: 0.8125rem;
+  color: rgba(255, 255, 255, 0.5);
+  margin-bottom: 0.5rem;
+  line-height: 1.4;
+}
+.nsec-field-block .auth-input {
+  margin-bottom: 0.5rem;
+}
+.nsec-actions {
+  display: flex;
+  gap: 0.5rem;
+  align-items: center;
+  margin-top: 0.5rem;
+}
+.nsec-cancel-btn {
+  padding: 0.5rem 1rem;
+  font-size: 0.875rem;
+  font-weight: 500;
+  color: rgba(255, 255, 255, 0.6);
+  background: transparent;
+  border: 1px solid rgba(255, 255, 255, 0.1);
+  border-radius: 12px;
+  cursor: pointer;
+  transition: color 0.2s ease, border-color 0.2s ease, background 0.2s ease;
+}
+.nsec-cancel-btn:hover {
+  color: rgba(255, 255, 255, 0.9);
+  border-color: rgba(255, 255, 255, 0.2);
+  background: rgba(255, 255, 255, 0.05);
+}
+
 /* Modal Transitions */
 .modal-fade-enter-active,
 .modal-fade-leave-active {