fix(lite): parse real syncstatus shapes (idle vs in-progress)

The real backend returns syncstatus as idle {"syncing":"false"} (string) or in-progress
{"syncing":"true","synced_blocks":N,"total_blocks":M} (commands.rs:83-87), but
parseLiteSyncStatusResponse hard-required the block fields and failed whenever the wallet
wasn't actively syncing — so sync/progress never updated in the real app.

- Read "syncing" as a string; require synced_blocks/total_blocks only when syncing=true;
  idle => complete, synced/total 0.
- fake_lite_backend syncstatus now uses the real "syncing":"true" shape.
- testLiteSyncStatusParserRealShapes covers idle, in-progress, and missing-counts-while-syncing.
- Verified against the live backend via lite_smoke --refresh (syncstatus parse_ok=1).

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

tests/test_phase4.cpp

@@ -4651,6 +4651,36 @@ void testLiteWalletControllerRefreshPopulatesState()
     EXPECT_FALSE(fresh.refreshWalletState(empty));
 }
 
+// syncstatus parser must accept both real backend shapes: idle {"syncing":"false"} and
+// in-progress {"syncing":"true","synced_blocks":N,"total_blocks":M} ("syncing" is a string).
+void testLiteSyncStatusParserRealShapes()
+{
+    using namespace dragonx::wallet;
+
+    // Idle: no block counts, syncing is the string "false".
+    {
+        const auto p = parseLiteSyncStatusResponse(std::string("{\"syncing\":\"false\"}"));
+        EXPECT_TRUE(p.ok);
+        EXPECT_EQ(static_cast<long long>(p.syncStatus.syncedBlocks), 0LL);
+        EXPECT_TRUE(p.syncStatus.complete);
+    }
+    // In-progress: block counts present.
+    {
+        const auto p = parseLiteSyncStatusResponse(
+            std::string("{\"syncing\":\"true\",\"synced_blocks\":900,\"total_blocks\":1000}"));
+        EXPECT_TRUE(p.ok);
+        EXPECT_EQ(static_cast<long long>(p.syncStatus.syncedBlocks), 900LL);
+        EXPECT_EQ(static_cast<long long>(p.syncStatus.totalBlocks), 1000LL);
+        EXPECT_FALSE(p.syncStatus.complete);
+        EXPECT_NEAR(p.syncStatus.progress, 0.9, 1e-9);
+    }
+    // While syncing, missing block counts is still an error.
+    {
+        const auto p = parseLiteSyncStatusResponse(std::string("{\"syncing\":\"true\"}"));
+        EXPECT_FALSE(p.ok);
+    }
+}
+
 // M2b-3: opening a wallet auto-starts the background worker, which produces a refresh model
 // the main thread can pick up via takeRefreshedModel() and apply to WalletState.
 void testLiteWalletControllerWorkerProducesModel()
@@ -4719,6 +4749,7 @@ int main()
     testLiteWalletControllerLifecycle();
     testLiteChainNameMigration();
     testLiteRefreshModelAppliesToWalletState();
+    testLiteSyncStatusParserRealShapes();
     testLiteWalletControllerRefreshPopulatesState();
     testLiteWalletControllerWorkerProducesModel();
     testLiteBridgeRuntimeShutdownIsIdempotent();