redesign pin and pattern UI, add settings for changing lock and enable/disable biometrics and add button to lock app from any screen

app/src/main/java/sh/sar/basedbank/ui/home/HomeActivity.kt

@@ -2,6 +2,8 @@ package sh.sar.basedbank.ui.home
 
 import android.content.Intent
 import android.os.Bundle
+import android.view.Menu
+import android.view.MenuItem
 import android.view.View
 import android.widget.Toast
 import androidx.activity.viewModels
@@ -131,6 +133,21 @@ class HomeActivity : AppCompatActivity() {
             .commit()
     }
 
+    override fun onCreateOptionsMenu(menu: Menu): Boolean {
+        menuInflater.inflate(R.menu.toolbar_menu, menu)
+        return true
+    }
+
+    override fun onOptionsItemSelected(item: MenuItem): Boolean {
+        if (item.itemId == R.id.action_lock) {
+            startActivity(Intent(this, sh.sar.basedbank.LockActivity::class.java))
+            finish()
+            return true
+        }
+        return super.onOptionsItemSelected(item)
+    }
+
+
     private fun autoRefresh(
         mibCreds: CredentialStore.MibCredentials?,
         bmlCreds: CredentialStore.BmlCredentials?,

app/src/main/java/sh/sar/basedbank/ui/home/SettingsFragment.kt

@@ -7,10 +7,12 @@ import android.view.View
 import android.view.ViewGroup
 import androidx.appcompat.app.AppCompatDelegate
 import androidx.appcompat.app.AppCompatDelegate.setApplicationLocales
+import androidx.biometric.BiometricManager
 import androidx.core.os.LocaleListCompat
 import androidx.fragment.app.Fragment
 import sh.sar.basedbank.R
 import sh.sar.basedbank.databinding.FragmentSettingsBinding
+import sh.sar.basedbank.ui.onboarding.SecuritySetupFragment
 
 class SettingsFragment : Fragment() {
 
@@ -25,7 +27,7 @@ class SettingsFragment : Fragment() {
     override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
         val prefs = requireContext().getSharedPreferences("prefs", Context.MODE_PRIVATE)
 
-        // Set initial selection
+        // Theme
         val saved = prefs.getString("theme", "system")
         val initialId = when (saved) {
             "light" -> R.id.btnThemeLight
@@ -57,6 +59,24 @@ class SettingsFragment : Fragment() {
             val tag = if (checkedId == R.id.btnLangDhivehi) "dv" else "en"
             setApplicationLocales(LocaleListCompat.forLanguageTags(tag))
         }
+
+        // Change lock
+        binding.btnChangeLock.setOnClickListener {
+            (requireActivity() as HomeActivity).showWithBackStack(
+                SecuritySetupFragment.newInstance(changeMode = true)
+            )
+        }
+
+        // Biometrics toggle — only show if device supports it
+        val canUseBiometrics = BiometricManager.from(requireContext())
+            .canAuthenticate(BiometricManager.Authenticators.BIOMETRIC_WEAK) == BiometricManager.BIOMETRIC_SUCCESS
+        if (canUseBiometrics) {
+            binding.rowBiometrics.visibility = View.VISIBLE
+            binding.switchBiometrics.isChecked = prefs.getBoolean("biometrics_enabled", false)
+            binding.switchBiometrics.setOnCheckedChangeListener { _, isChecked ->
+                prefs.edit().putBoolean("biometrics_enabled", isChecked).apply()
+            }
+        }
     }
 
     override fun onResume() {