feat: cold start on scanning nfc tag

app/src/main/java/com/bitcointxoko/gudariwallet/MainActivity.kt

@@ -4,6 +4,7 @@ import android.Manifest
 import android.app.PendingIntent
 import android.content.ActivityNotFoundException
 import android.content.Intent
+import android.content.IntentFilter
 import android.nfc.NfcAdapter
 import android.nfc.Tag
 import android.os.Build
@@ -54,8 +55,12 @@ class MainActivity : AppCompatActivity() {
     private val nfcPendingIntent: PendingIntent by lazy {
         PendingIntent.getActivity(
             this, 0,
-            Intent(this, javaClass).addFlags(Intent.FLAG_ACTIVITY_SINGLE_TOP),
-            PendingIntent.FLAG_MUTABLE
+            Intent(this, javaClass).apply {
+                addFlags(Intent.FLAG_ACTIVITY_SINGLE_TOP)
+                // Do NOT add FLAG_ACTIVITY_NEW_TASK — this causes
+                // balDontBringExistingBackgroundTaskStackToFg = true
+            },
+            PendingIntent.FLAG_MUTABLE or PendingIntent.FLAG_UPDATE_CURRENT
         )
     }
 
@@ -102,6 +107,8 @@ class MainActivity : AppCompatActivity() {
         // Initialise NFC adapter (null on devices without NFC — handled gracefully)
         nfcAdapter = NfcAdapter.getDefaultAdapter(this)
 
+        nfcVm.onNfcIntent(intent)
+
         enableEdgeToEdge()
 
         setContent {
@@ -137,13 +144,18 @@ class MainActivity : AppCompatActivity() {
 
     override fun onResume() {
         super.onResume()
-        // Give this activity first pick of all NFC tag intents while foregrounded.
-        // Passing null for techLists and intentFilters means we intercept every tag type.
+        // Restrict to NDEF only — avoids TAG_DISCOVERED BAL blocks for non-NDEF tags
+        val intentFilters = arrayOf(
+            IntentFilter(NfcAdapter.ACTION_NDEF_DISCOVERED).also { f ->
+                try { f.addDataType("*/*") } catch (_: IntentFilter.MalformedMimeTypeException) {}
+            }
+        )
+        val techLists = arrayOf(arrayOf(android.nfc.tech.Ndef::class.java.name))
         nfcAdapter?.enableForegroundDispatch(
             this,
             nfcPendingIntent,
-            null,   // intercept all intent filters
-            null    // intercept all tech lists
+            intentFilters,
+            techLists
         )
     }
 
@@ -174,12 +186,20 @@ class MainActivity : AppCompatActivity() {
         }
 
         // NFC tag discovered → hand off to NfcViewModel for reading
-        val tag = intent.getParcelableExtra<Tag>(NfcAdapter.EXTRA_TAG)
+        val tag = intent.getNfcTag()
         if (tag != null) {
             nfcVm.onTagDiscovered(tag)
         }
     }
 
+    private fun Intent.getNfcTag(): Tag? =
+        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.TIRAMISU) {
+            getParcelableExtra(NfcAdapter.EXTRA_TAG, Tag::class.java)
+        } else {
+            @Suppress("DEPRECATION")
+            getParcelableExtra(NfcAdapter.EXTRA_TAG)
+        }
+
     // ── Permission / battery helpers (unchanged) ──────────────────────────────
 
     private fun requestNotificationPermissionIfNeeded() {