Add touch gesture support and LilyGo T5 S3 board

Implements bottom-edge swipe-up gesture detection and delayed touch-select with tracking state. Adds isTouchTapCandidate() to distinguish taps from swipes. Includes LilyGo T5 S3 board configuration with USB CDC logging transport for boards where Serial operator bool reports false incorrectly.

src/activities/home/FileBrowserActivity.cpp

@@ -214,8 +214,6 @@ void FileBrowserActivity::loop() {
     return;
   }
 
-  // Touch-down moves the selector to the pressed entry (shows selected state); release
-  // opens it below.
   int downId = -1;
   if (mappedInput.wasItemTouchedDown(downId) && downId >= 0 && downId < static_cast<int>(files.size())) {
     selectorIndex = downId;