feat(chat): harvest chat memos on the lite variant (lite receive)

The full-node receive harvest works off z_viewtransaction; the lite wallet's
transactions come from the backend instead, so lite chat receive was unwired.

App::ingestLiteChatMemos runs after each lite refresh: the backend lists one
entry per received (non-change) note — same txid, distinct position + decoded
UTF-8 memo — so a chat tx yields two entries (header + payload). Group the
Receive-kind notes by txid, feed them through the SAME extractHushChatTransaction
Metadata parser (now order-tolerant, so the daemon's output shuffle is a non-issue),
and thread the result into ChatService. The store dedups (txid+position), so
re-listing every refresh is harmless.

This closes the lite variant's chat loop end-to-end: identity (exportSeed), DB
unlock/load, receive (here), UI, and send (broadcastChatMemosLite). Gated by
DRAGONX_ENABLE_CHAT (default OFF). Verified: Linux + Windows build with chat ON,
ctest 100%, hygiene clean; caches restored to OFF.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

src/app.h

@@ -38,7 +38,7 @@ namespace dragonx {
     namespace config { class Settings; }
     namespace daemon { class DaemonController; class EmbeddedDaemon; class XmrigManager; }
     namespace util { class Bootstrap; class SecureVault; }
-    namespace wallet { class LiteWalletController; }
+    namespace wallet { class LiteWalletController; struct LiteWalletAppRefreshModel; }
 }
 
 namespace dragonx {
@@ -597,6 +597,7 @@ private:
     std::string generateChatLocalId(const char* prefix, int numBytes) const;  // unique echo id / cid
     void broadcastChatMemos(const chat::OutgoingChatMemos& memos);      // full-node z_sendmany / lite
     void broadcastChatMemosLite(const chat::OutgoingChatMemos& memos);  // lite two-recipient send
+    void ingestLiteChatMemos(const wallet::LiteWalletAppRefreshModel& model);  // lite chat receive harvest
     // Lite first-run welcome prompt: dismissed for the session once the user picks an action.
     bool lite_firstrun_dismissed_ = false;
     // Lite send-time unlock: set to show the unlock modal when a spend is attempted while locked.