wip: merge develop and fix span migration for Arduino 3.0

Merge develop into feat/arduino-3.0. Replace remaining tcb::span with
std::span, add missing WiFi.h include. Build not yet clean — remaining
issues: Serial namespace rename (SerialCmds), USBSerial API, and
CaptivePortalConfig struct changes.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: hhvrc

include/captiveportal/CaptivePortalInstance.h

@@ -1,7 +1,7 @@
 #pragma once
 
 #include "Common.h"
-#include "span.h"
+#include <span>
 #include "WebSocketDeFragger.h"
 
 #include <DNSServer.h>
@@ -25,16 +25,16 @@ namespace OpenShock::CaptivePortal {
     ~CaptivePortalInstance();
 
     bool sendMessageTXT(uint8_t socketId, std::string_view data) { return m_socketServer.sendTXT(socketId, data.data(), data.length()); }
-    bool sendMessageBIN(uint8_t socketId, tcb::span<const uint8_t> data) { return m_socketServer.sendBIN(socketId, data.data(), data.size()); }
+    bool sendMessageBIN(uint8_t socketId, std::span<const uint8_t> data) { return m_socketServer.sendBIN(socketId, data.data(), data.size()); }
     bool broadcastMessageTXT(std::string_view data) { return m_socketServer.broadcastTXT(data.data(), data.length()); }
-    bool broadcastMessageBIN(tcb::span<const uint8_t> data) { return m_socketServer.broadcastBIN(data.data(), data.size()); }
+    bool broadcastMessageBIN(std::span<const uint8_t> data) { return m_socketServer.broadcastBIN(data.data(), data.size()); }
     bool hasClients() { return m_socketServer.connectedClients() > 0; }
 
   private:
     void task();
     void handleWebSocketClientConnected(uint8_t socketId);
     void handleWebSocketClientDisconnected(uint8_t socketId);
-    void handleWebSocketEvent(uint8_t socketId, WebSocketMessageType type, tcb::span<const uint8_t> payload);
+    void handleWebSocketEvent(uint8_t socketId, WebSocketMessageType type, std::span<const uint8_t> payload);
 
     AsyncWebServer m_webServer;
     WebSocketsServer m_socketServer;

src/captiveportal/Manager.cpp

@@ -267,7 +267,7 @@ bool CaptivePortal::SendMessageTXT(uint8_t socketId, std::string_view data)
 
   return true;
 }
-bool CaptivePortal::SendMessageBIN(uint8_t socketId, tcb::span<const uint8_t> data)
+bool CaptivePortal::SendMessageBIN(uint8_t socketId, std::span<const uint8_t> data)
 {
   auto instance = GetInstance();
   if (instance == nullptr) return false;
@@ -286,7 +286,7 @@ bool CaptivePortal::BroadcastMessageTXT(std::string_view data)
 
   return true;
 }
-bool CaptivePortal::BroadcastMessageBIN(tcb::span<const uint8_t> data)
+bool CaptivePortal::BroadcastMessageBIN(std::span<const uint8_t> data)
 {
   auto instance = GetInstance();
   if (instance == nullptr) return false;

src/http/HTTPRequestManager.cpp

@@ -11,6 +11,7 @@ const char* const TAG = "HTTPRequestManager";
 #include "util/StringUtils.h"
 
 #include <HTTPClient.h>
+#include <WiFi.h>
 
 #include <algorithm>
 #include <memory>
@@ -350,7 +351,7 @@ static StreamReaderResult readHttpStreamData(HTTPClient& client, WiFiClient* str
 }
 
 HTTP::Response<std::size_t>
-  HTTP::Download(std::string_view url, const std::map<String, String>& headers, HTTP::GotContentLengthCallback contentLengthCallback, HTTP::DownloadCallback downloadCallback, tcb::span<const uint16_t> acceptedCodes, uint32_t timeoutMs)
+  HTTP::Download(std::string_view url, const std::map<String, String>& headers, HTTP::GotContentLengthCallback contentLengthCallback, HTTP::DownloadCallback downloadCallback, std::span<const uint16_t> acceptedCodes, uint32_t timeoutMs)
 {
   std::shared_ptr<OpenShock::RateLimiter> rateLimiter = createRateLimiterForURL(url);
   if (rateLimiter == nullptr) {
@@ -450,7 +451,7 @@ HTTP::Response<std::size_t>
   return {result.result, responseCode, result.nWritten};
 }
 
-HTTP::Response<std::string> HTTP::GetString(std::string_view url, const std::map<String, String>& headers, tcb::span<const uint16_t> acceptedCodes, uint32_t timeoutMs)
+HTTP::Response<std::string> HTTP::GetString(std::string_view url, const std::map<String, String>& headers, std::span<const uint16_t> acceptedCodes, uint32_t timeoutMs)
 {
   std::string result;
 

src/message_handlers/websocket/Gateway.cpp

@@ -37,7 +37,7 @@ static std::array<Handlers::HandlerType, HANDLER_COUNT> s_serverHandlers = []()
   return handlers;
 }();
 
-void MessageHandlers::WebSocket::HandleGatewayBinary(tcb::span<const uint8_t> data)
+void MessageHandlers::WebSocket::HandleGatewayBinary(std::span<const uint8_t> data)
 {
   if (data.size() < sizeof(flatbuffers::uoffset_t)) {
     OS_LOGE(TAG, "Message too small to be a valid FlatBuffer");