M1 step 5: IRC App

- Chat: header (Buffer n/N, unread elsewhere, topic or connection
  state), wrapped hh:mm <nick> lines (own in accent, Mentions green,
  info grey), input line; Tab cycles Buffers, Fn+Up/Down scrolls back,
  Enter sends, Back leaves while the IRC Service keeps running
- /settings: server form (host, port, TLS, self-signed pinning, nick,
  SASL, NickServ, auto-join); Save & reconnect restarts the session
- Opening the App starts the IRC Service; viewing a Buffer clears its
  unread count; IrcSession gains a revision counter for redraws

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01EhqxQ49eCju4CzKYNjZzwT

src/services/irc_service.cpp

@@ -50,11 +50,14 @@ int IrcService::totalUnread() {
 
 std::string IrcService::saveConfig() {
     std::string error = config_.save();
-    if (error.empty() && !wanted_) {
+    if (!error.empty()) return error;
+    if (wanted_) {
+        restart_ = true;  // the task reconnects with a fresh session
+    } else {
         Lock l(lock_);
         session_.reset(new IrcSession(config_));  // a new server or nick starts a fresh session
     }
-    return error;
+    return "";
 }
 
 void IrcService::taskEntry(void* self) { static_cast<IrcService*>(self)->loop(); }
@@ -178,6 +181,18 @@ void IrcService::loop() {
         bool wifiUp = wifi_.state() == WifiController::State::Connected;
         bool monitoring = wifi_.state() == WifiController::State::Monitoring;
 
+        if (restart_) {
+            restart_ = false;
+            if (open_) {
+                conn_->print("QUIT :reconfiguring\r\n");
+                vTaskDelay(pdMS_TO_TICKS(300));
+                close("");
+            }
+            Lock l(lock_);
+            session_.reset(new IrcSession(config_));
+            retryAtMs_ = now;
+            backoff_.reset();
+        }
         if (!wanted_) {
             if (open_) close("disconnected");
             status_ = Status::Stopped;