fix misc build warnings. NFC

src/graphics/draw/UIRenderer.cpp

@@ -35,7 +35,7 @@ std::string sanitizeString(const std::string &input)
             inReplacement = false;
         } else {
             if (!inReplacement) {
-                output += '¿';
+                output += 0xbf; // ISO-8859-1 for inverted question mark
                 inReplacement = true;
             }
         }

src/input/ButtonThread.cpp

@@ -266,6 +266,11 @@ int32_t ButtonThread::runOnce()
 
             break;
         }
+
+        // doesn't handle BUTTON_EVENT_PRESSED_SCREEN BUTTON_EVENT_TOUCH_LONG_PRESSED BUTTON_EVENT_COMBO_SHORT_LONG
+        default: {
+            break;
+        }
         }
     }
     btnEvent = BUTTON_EVENT_NONE;

src/modules/SystemCommandsModule.cpp

@@ -113,6 +113,10 @@ int SystemCommandsModule::handleInputEvent(const InputEvent *event)
         shutdownAtMsec = millis() + DEFAULT_SHUTDOWN_SECONDS * 1000;
         // runState = CANNED_MESSAGE_RUN_STATE_INACTIVE;
         return true;
+
+    default:
+        // No other input events handled here
+        break;
     }
     return false;
 }