fix(lite): show real block height when synced (was 0)

The lite status bar showed "blocks: 0" once fully synced. The backend's
`syncstatus` only includes synced_blocks/total_blocks WHILE actively scanning;
at rest it returns just {"syncing":"false"}, so the parsed syncedBlocks was 0
and became state.sync.blocks. On the synced refresh path, additionally query the
backend `height` command (wallet last-scanned height, a fast local read) and use
it as the synced height/tip, so the block count is correct at rest.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

src/wallet/lite_wallet_controller.cpp

@@ -687,6 +687,29 @@ std::optional<LiteWalletAppRefreshModel> LiteWalletController::refreshModel()
     if (!mapped.ok) return std::nullopt;
     auto model = mapped.model;
     applyEncryption(model);
+
+    // `syncstatus` only reports synced_blocks/total_blocks WHILE actively scanning; once idle it
+    // returns just {"syncing":"false"}, so the mapped walletHeight is 0 and the status bar showed
+    // "blocks: 0" when fully synced. Query the wallet's last-scanned height (a fast local read) and
+    // surface it as the synced height/tip so the block count is correct at rest.
+    if (bridge_) {
+        const auto h = bridge_->execute("height", "");
+        if (h.ok) {
+            try {
+                const auto j = nlohmann::json::parse(h.value);
+                if (j.is_object() && j.contains("height") && j["height"].is_number_unsigned()) {
+                    const unsigned long long height = j["height"].get<unsigned long long>();
+                    if (height > 0) {
+                        model.hasSyncStatus = true;
+                        model.sync.walletHeight = height;
+                        model.sync.chainHeight  = height;  // synced: wallet height == chain tip
+                        model.sync.complete     = true;
+                        model.sync.progress     = 1.0;
+                    }
+                }
+            } catch (...) { /* leave the mapped sync fields as-is */ }
+        }
+    }
     return model;
 }