fix: send message on main Return key in MUI composer (X11/native-tft)

LVGL's X11 input driver maps only XK_KP_Enter to LV_KEY_ENTER; the main
Return key falls through XLookupString as a raw '\r', which the one-line
message textarea silently discards (lv_textarea.c one_line filter). As a
result, typing worked but pressing Enter never sent the message - only
the on-screen keyboard checkmark did (lv_keyboard sends LV_EVENT_READY
directly).

Handle LV_EVENT_KEY == '\r' in ui_event_message_ready and route it into
the existing LV_EVENT_READY send logic. Keypad Enter is unaffected (its
LV_KEY_ENTER already triggers a nested LV_EVENT_READY from the textarea
class handler, and '\n' != '\r' avoids any double-send). The
space+return CR_REPLACEMENT newline trick keeps working, now also with
the physical Return key.

Author: p0ns

source/graphics/TFT/TFTView_320x240.cpp

@@ -1678,6 +1678,15 @@ void TFTView_320x240::ui_event_Keyboard(lv_event_t *e)
 void TFTView_320x240::ui_event_message_ready(lv_event_t *e)
 {
     lv_event_code_t event_code = lv_event_get_code(e);
+    if (event_code == LV_EVENT_KEY) {
+        // LVGL's X11 driver maps only keypad enter to LV_KEY_ENTER; the main Return
+        // key arrives as raw '\r' and is silently dropped by the one-line textarea.
+        // Treat it as ready-to-send so a physical Enter submits the message.
+        uint32_t *key = (uint32_t *)lv_event_get_param(e);
+        if (!key || *key != '\r')
+            return;
+        event_code = LV_EVENT_READY;
+    }
     if (event_code == LV_EVENT_READY) {
         char *txt = (char *)lv_textarea_get_text(objects.message_input_area);
         uint32_t len = strlen(txt);