fix nostr private messages processing (#563)

* fix nostr private messages processing

* persisted geohash registry

---------

Co-authored-by: a1denvalu3 <>

app/src/main/java/com/bitchat/android/nostr/GeohashAliasRegistry.kt

@@ -1,17 +1,40 @@
 package com.bitchat.android.nostr
 
+import android.content.Context
+import android.content.SharedPreferences
 import java.util.concurrent.ConcurrentHashMap
 
 /**
  * GeohashAliasRegistry
  * - Global, thread-safe registry for alias->Nostr pubkey mappings (e.g., nostr_<pub16> -> pubkeyHex)
- * - Allows non-UI components (e.g., MessageRouter) to resolve geohash DM aliases without depending on UI ViewModels
+ * - Persisted to SharedPreferences to survive app restarts.
  */
 object GeohashAliasRegistry {
     private val map: MutableMap<String, String> = ConcurrentHashMap()
+    private const val PREFS_NAME = "geohash_alias_registry"
+    private var prefs: SharedPreferences? = null
+
+    fun initialize(context: Context) {
+        if (prefs == null) {
+            prefs = context.getSharedPreferences(PREFS_NAME, Context.MODE_PRIVATE)
+            loadFromPrefs()
+        }
+    }
+
+    private fun loadFromPrefs() {
+        prefs?.let { p ->
+            val allEntries = p.all
+            for ((key, value) in allEntries) {
+                if (key is String && value is String) {
+                    map[key] = value
+                }
+            }
+        }
+    }
 
     fun put(alias: String, pubkeyHex: String) {
         map[alias] = pubkeyHex
+        prefs?.edit()?.putString(alias, pubkeyHex)?.apply()
     }
 
     fun get(alias: String): String? = map[alias]
@@ -20,5 +43,8 @@ object GeohashAliasRegistry {
 
     fun snapshot(): Map<String, String> = HashMap(map)
 
-    fun clear() { map.clear() }
+    fun clear() {
+        map.clear()
+        prefs?.edit()?.clear()?.apply()
+    }
 }