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/LockActivity.kt

@@ -51,6 +51,10 @@ class LockActivity : AppCompatActivity() {
     }
 
     private fun buildNumpad() {
+        val dp = resources.displayMetrics.density
+        val btnSize = (68 * dp).toInt()
+        val btnMarginH = (10 * dp).toInt()
+        val rowMarginV = (6 * dp).toInt()
         val rows = listOf(
             listOf("1", "2", "3"),
             listOf("4", "5", "6"),
@@ -60,9 +64,11 @@ class LockActivity : AppCompatActivity() {
         rows.forEach { keys ->
             val row = LinearLayout(this).apply {
                 orientation = LinearLayout.HORIZONTAL
+                gravity = android.view.Gravity.CENTER
                 layoutParams = LinearLayout.LayoutParams(
-                    LinearLayout.LayoutParams.MATCH_PARENT, 0, 1f
-                )
+                    LinearLayout.LayoutParams.WRAP_CONTENT,
+                    LinearLayout.LayoutParams.WRAP_CONTENT
+                ).also { it.setMargins(0, rowMarginV, 0, rowMarginV) }
             }
             keys.forEach { key ->
                 val style = if (key == "✓")
@@ -71,10 +77,12 @@ class LockActivity : AppCompatActivity() {
                     com.google.android.material.R.attr.materialButtonOutlinedStyle
                 val btn = MaterialButton(this, null, style).apply {
                     text = key
-                    textSize = 20f
+                    textSize = 24f
                     insetTop = 0; insetBottom = 0
-                    layoutParams = LinearLayout.LayoutParams(0, LinearLayout.LayoutParams.MATCH_PARENT, 1f)
-                        .also { it.setMargins(4, 4, 4, 4) }
+                    minimumWidth = 0; minimumHeight = 0
+                    cornerRadius = btnSize / 2
+                    layoutParams = LinearLayout.LayoutParams(btnSize, btnSize)
+                        .also { it.setMargins(btnMarginH, 0, btnMarginH, 0) }
                 }
                 btn.setOnClickListener { handleKey(key) }
                 row.addView(btn)