feat(lite): M2b-1/2 — shared-bridge refactor + sync/refresh into WalletState

Shared-bridge refactor (litelib is a global singleton; every LiteClientBridge calls
litelib_shutdown() on destruction, so services must not each own one):
- LiteWalletLifecycleService, LiteWalletGateway, LiteSyncService now take a non-owning
  LiteClientBridge*; LiteWalletController owns the single bridge and passes &bridge_.

Sync + controller refresh:
- LiteSyncService::startSync executes the real "sync" command (was a stub).
- LiteWalletController: startSync() (auto-fires when a wallet becomes ready) and
  refreshWalletState(WalletState&) — polls syncstatus, runs gateway.refresh(), maps the
  bundle, applies balances/addresses/transactions/sync into WalletState.

Tests:
- fake_lite_backend.h returns command-shaped JSON (per tests/fixtures/lite/result_parsers.json).
- testLiteWalletControllerRefreshPopulatesState drives the full path against the fake.
- Surfaced + worked around a real integration issue: parseLiteInfoResponse requires
  latest_block_height and the gateway aborts the whole refresh on the first command's
  parse failure (fragile vs partial backend responses; hardening tracked for M2b-3).

Verified: ctest green; lite+backend, full-node, lite-no-backend apps + lite_smoke build clean.

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

src/wallet/lite_sync_service.h

@@ -123,7 +123,7 @@ class LiteSyncService {
 public:
     LiteSyncService(WalletCapabilities capabilities,
                     LiteConnectionSettings connectionSettings,
-                    LiteClientBridge bridge,
+                    LiteClientBridge* bridge,
                     LiteSyncServiceOptions options = {});
 
     const WalletCapabilities& capabilities() const { return capabilities_; }
@@ -155,7 +155,7 @@ private:
 
     WalletCapabilities capabilities_;
     LiteConnectionSettings connectionSettings_;
-    LiteClientBridge bridge_;
+    LiteClientBridge* bridge_ = nullptr;  // non-owning; owned by LiteWalletController
     LiteSyncServiceOptions options_;
 };