BaseUI: remove legacy single-message runtime path and keep multimessage flow (#10450)

* cleanup

* Potential fix for pull request finding

Co-authored-by: Copilot Autofix powered by AI <175728472+Copilot@users.noreply.github.com>

* Potential fix for pull request finding

Co-authored-by: Copilot Autofix powered by AI <175728472+Copilot@users.noreply.github.com>

* Potential fix for pull request finding

Co-authored-by: Copilot Autofix powered by AI <175728472+Copilot@users.noreply.github.com>

---------

Co-authored-by: Copilot Autofix powered by AI <175728472+Copilot@users.noreply.github.com>

src/modules/TextMessageModule.h

@@ -7,8 +7,8 @@
  * Text message handling for Meshtastic.
  *
  * This module is responsible for receiving and storing incoming text messages
- * from the mesh. It updates device state and notifies observers so that other
- * components (such as the MessageRenderer) can later display or process them.
+ * from the mesh. It notifies observers so that other components (such as the
+ * MessageRenderer) can later display or process them.
  *
  * Rendering of messages on screen is no longer done here.
  */
@@ -36,4 +36,4 @@ class TextMessageModule : public SinglePortModule, public Observable<const mesht
     size_t textPacketListIndex = 0;
 };
 
-extern TextMessageModule *textMessageModule;
+extern TextMessageModule *textMessageModule;