Add reset stats functionality to stats screen with confirmation dialog

app/src/main/java/com/mintris/StatsActivity.kt

@@ -3,6 +3,7 @@ package com.mintris
 import android.os.Bundle
 import android.widget.Button
 import android.widget.TextView
+import androidx.appcompat.app.AlertDialog
 import androidx.appcompat.app.AppCompatActivity
 import com.mintris.databinding.ActivityStatsBinding
 import com.mintris.model.StatsManager
@@ -25,9 +26,26 @@ class StatsActivity : AppCompatActivity() {
             finish()
         }
 
+        // Set up reset stats button
+        binding.resetStatsButton.setOnClickListener {
+            showResetConfirmationDialog()
+        }
+
         updateStats()
     }
 
+    private fun showResetConfirmationDialog() {
+        AlertDialog.Builder(this)
+            .setTitle("Reset Stats")
+            .setMessage("Are you sure you want to reset all your stats? This cannot be undone.")
+            .setPositiveButton("Reset") { _, _ ->
+                statsManager.resetStats()
+                updateStats()
+            }
+            .setNegativeButton("Cancel", null)
+            .show()
+    }
+
     private fun updateStats() {
         // Format time duration
         val timeFormat = SimpleDateFormat("HH:mm:ss", Locale.getDefault())

app/src/main/java/com/mintris/model/StatsManager.kt

@@ -157,6 +157,27 @@ class StatsManager(context: Context) {
     fun getSessionTriples(): Int = sessionTriples
     fun getSessionTetrises(): Int = sessionTetrises
     
+    fun resetStats() {
+        // Reset all lifetime stats
+        totalGames = 0
+        totalScore = 0
+        totalLines = 0
+        totalPieces = 0
+        totalTime = 0
+        maxLevel = 0
+        maxScore = 0
+        maxLines = 0
+        
+        // Reset line clear stats
+        totalSingles = 0
+        totalDoubles = 0
+        totalTriples = 0
+        totalTetrises = 0
+        
+        // Save the reset stats
+        saveStats()
+    }
+    
     companion object {
         private const val PREFS_NAME = "mintris_stats"
         private const val KEY_TOTAL_GAMES = "total_games"