IRC App: Alt scrolls, Up/Down recall sent lines; /j for /join

- Alt + ; / Alt + . scroll the Buffer back and forward
- Up / Down (Fn + ; / Fn + .) browse the last 30 sent lines, shell-style,
  returning to the draft past the newest (InputHistory, host-tested)
- /j is short for /join

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

src/apps/irc_app.cpp

@@ -80,13 +80,24 @@ bool IrcApp::onKey(const KeyEvent& e) {
 }
 
 bool IrcApp::onChatKey(const KeyEvent& e) {
+    // Alt + ; / Alt + . scroll the Buffer; Up / Down (Fn + ; / Fn + .) recall sent lines.
+    if (e.key == Key::Char && e.alt && (e.ch == ';' || e.ch == '.')) {
+        if (e.ch == ';') scroll_++;  // older
+        else if (scroll_ > 0) scroll_--;
+        return true;
+    }
+    std::string recalled;
     switch (e.key) {
         case Key::Char: input_.insert(e.ch); break;
         case Key::Delete: input_.backspace(); break;
         case Key::Left: input_.left(); break;
         case Key::Right: input_.right(); break;
-        case Key::Up: scroll_++; break;  // older
-        case Key::Down: if (scroll_ > 0) scroll_--; break;
+        case Key::Up:
+            if (history_.up(input_.text(), recalled)) input_.setText(recalled);
+            break;
+        case Key::Down:
+            if (history_.down(recalled)) input_.setText(recalled);
+            break;
         case Key::Tab: {
             int count = irc_.withSession([](IrcSession& s) { return s.bufferCount(); });
             view((current_ + 1) % count);
@@ -95,6 +106,7 @@ bool IrcApp::onChatKey(const KeyEvent& e) {
         case Key::Select: {
             std::string text = input_.text();
             if (text.empty()) break;
+            history_.add(text);
             input_.setText("");
             scroll_ = 0;
             if (lowered(text) == "/settings") {

src/apps/irc_app.h

@@ -5,6 +5,7 @@
 
 #include "app.h"
 #include "event_bus.h"
+#include "input_history.h"
 #include "line_editor.h"
 #include "list_model.h"
 #include "services/irc_service.h"
@@ -48,6 +49,7 @@ class IrcApp : public App {
     uint32_t seenRevision_ = 0;
     IrcService::Status seenStatus_ = IrcService::Status::Stopped;
     LineEditor input_{400};
+    InputHistory history_{30};
     ListModel fields_{theme::kContent.h / theme::kLineHeight};
     bool editing_ = false;
     LineEditor fieldEditor_{63};