Update login and password reset UI across iOS and Android

- Add email/username login support
  - Android: Update LoginScreen with email keyboard type
  - iOS: Update LoginView with email keyboard support

- Refactor iOS password reset screens to use native SwiftUI components
  - Convert ForgotPasswordView to use Form with Sections
  - Convert VerifyResetCodeView to use Form with Sections
  - Convert ResetPasswordView to use Form with Sections
  - Use Label components for error/success messages
  - Add navigation titles and improve iOS-native appearance

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

composeApp/src/commonMain/kotlin/com/example/mycrib/ui/screens/LoginScreen.kt

@@ -7,10 +7,13 @@ import androidx.compose.material.icons.Icons
 import androidx.compose.material.icons.filled.*
 import androidx.compose.material3.*
 import androidx.compose.runtime.*
+import androidx.compose.foundation.text.KeyboardOptions
 import androidx.compose.ui.Alignment
 import androidx.compose.ui.Modifier
 import androidx.compose.ui.draw.clip
 import androidx.compose.ui.text.font.FontWeight
+import androidx.compose.ui.text.input.ImeAction
+import androidx.compose.ui.text.input.KeyboardType
 import androidx.compose.ui.text.input.PasswordVisualTransformation
 import androidx.compose.ui.text.input.VisualTransformation
 import androidx.compose.ui.unit.dp
@@ -84,13 +87,17 @@ fun LoginScreen(
                 OutlinedTextField(
                     value = username,
                     onValueChange = { username = it },
-                    label = { Text("Username") },
+                    label = { Text("Username or Email") },
                     leadingIcon = {
                         Icon(Icons.Default.Person, contentDescription = null)
                     },
                     modifier = Modifier.fillMaxWidth(),
                     singleLine = true,
-                    shape = RoundedCornerShape(12.dp)
+                    shape = RoundedCornerShape(12.dp),
+                    keyboardOptions = KeyboardOptions(
+                        keyboardType = KeyboardType.Email,
+                        imeAction = ImeAction.Next
+                    )
                 )
 
                 OutlinedTextField(