fix(lite): drop the 15 s startup overlay and a TLS connection per refresh

- The refresh-model mapper marks the encryption state known when the
  backend reports it. The wallet tabs wait for that, so every Lite
  launch sat behind the loading overlay until the 15 s "assume
  unencrypted" fallback.
- Each 2 s refresh skips the backend's `info` (a fresh TLS connection
  and GetLightdInfo, only a fallback for the chat tip, which the
  explicit height call already provides) and the gateway's `height`
  (replaced by that explicit call, which runs after the sync commands
  so it sees the newest block).

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

tests/test_phase4.cpp

@@ -6840,6 +6840,15 @@ void testLiteWalletControllerEncryption()
         applyLiteRefreshModelToWalletState(model, state);
         EXPECT_TRUE(state.isEncrypted());
         EXPECT_TRUE(state.isLocked());
+        // ...and marks it known: the wallet tabs wait for that (lite used to sit behind the loading
+        // overlay until the 15 s "assume unencrypted" fallback).
+        EXPECT_TRUE(state.encryption_state_known);
+
+        LiteWalletAppRefreshModel syncOnly;
+        syncOnly.hasSyncStatus = true;
+        dragonx::WalletState untouched;
+        applyLiteRefreshModelToWalletState(syncOnly, untouched);
+        EXPECT_FALSE(untouched.encryption_state_known);
     }
 }