fix: bound map TLS handshake latency

lib/tdeck_ui/Hardware/TDeck/MapTileHttpArduino.cpp

@@ -32,6 +32,10 @@ TileTransportResult MapTileHttpArduino::start(const char* url, const char* user_
 
     client_.setCACert(ca_certificate);
     client_.setTimeout(read_timeout_ms);
+    unsigned long handshake_seconds = static_cast<unsigned long>(connect_timeout_ms / 1000U);
+    if ((connect_timeout_ms % 1000U) != 0U) ++handshake_seconds;
+    if (handshake_seconds == 0UL) handshake_seconds = 1UL;
+    client_.setHandshakeTimeout(handshake_seconds);
     http_.setConnectTimeout(boundedConnectTimeout(connect_timeout_ms));
     http_.setTimeout(boundedReadTimeout(read_timeout_ms));
     // Keep the single visible-tile TLS session alive across sequential requests.

tests/build_scripts/test_map_tile_downloader_contract.py

@@ -35,6 +35,7 @@ def test_https_adapter_verifies_peer_with_explicit_ca_and_has_no_credentials():
     assert "setInsecure" not in source
     assert "setConnectTimeout" in source
     assert "setTimeout" in source
+    assert "setHandshakeTimeout" in source
     assert "setReuse(true)" in source
     assert "useHTTP10(true)" not in source
     assert "disconnectIdle" in source