Feat/mesh robustness efficiency (#451)

* chat: de-dup private chats across ephemeral/stable IDs; prefer most advanced delivery status\n\n- Fixes LazyVStack duplicate ID warnings and blank row in PM\n- Merges messages by id from ephemeral and Noise-key stores\n- Chooses read > delivered > partiallyDelivered > sent > sending > failed (newer wins on tie)\n- Ensures status icon updates immediately without waiting for another send\n- Adds exhaustive handling for DeliveryStatus in ranking

* logging: reduce noisy info logs to debug; keep errors/warnings\n\n- Downgrade routing/ACK/subscription/connect logs to debug\n- Retain security/fingerprint/keychain info logs\n- Keep errors and warnings intact\n\ndocs: add docs/privacy-assessment.md covering BLE privacy, routing TTL/jitter, Nostr E2E gift wraps, ACK throttling, and logging posture

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Co-authored-by: jack <jackjackbits@users.noreply.github.com>

bitchat/Services/FavoritesPersistenceService.swift

@@ -176,6 +176,18 @@ class FavoritesPersistenceService: ObservableObject {
     func getFavoriteStatus(for peerNoisePublicKey: Data) -> FavoriteRelationship? {
         favorites[peerNoisePublicKey]
     }
+
+    /// Resolve favorite status by short peer ID (16-hex derived from Noise pubkey)
+    /// Falls back to scanning favorites and matching on derived peer ID.
+    func getFavoriteStatus(forPeerID peerID: String) -> FavoriteRelationship? {
+        // Quick sanity: peerID should be 16 hex chars (8 bytes)
+        guard peerID.count == 16 else { return nil }
+        for (pubkey, rel) in favorites {
+            let derived = PeerIDUtils.derivePeerID(fromPublicKey: pubkey)
+            if derived == peerID { return rel }
+        }
+        return nil
+    }
     
     /// Update Nostr public key for a peer
     func updateNostrPublicKey(for peerNoisePublicKey: Data, nostrPubkey: String) {