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/main.cpp

@@ -3,6 +3,7 @@
 
 #include "app_manager.h"
 #include "apps/demo_app.h"
+#include "apps/irc_app.h"
 #include "apps/launcher_app.h"
 #include "apps/settings_app.h"
 #include "apps/setup_app.h"
@@ -113,6 +114,7 @@ void setup() {
 
     apps = new AppManager(launcher);
     launcher.setManager(*apps);
+    apps->registerApp({"irc", "IRC", false, new IrcApp(*irc, *clockService, bus)});
     apps->registerApp({"settings", "Settings", false,
                        new SettingsApp({settings, bus, *apps, *battery, *storageService, *clockService, *wifi, *savedNetworks})});
     apps->registerApp({"demo", "Widget demo", true, new DemoApp(bus)});