Remove obsolete TODO comments and clarify code

Clean up outdated TODO comments that are no longer relevant and improve comment clarity in activity classes and parsers.

src/activities/util/BmpViewerActivity.cpp

@@ -107,13 +107,9 @@ void BmpViewerActivity::onEnter() {
       GUI.fillPopupProgress(renderer, popupRect, 50);
 
       renderer.clearScreen();
-      // Assuming drawBitmap defaults to 0,0 crop if omitted, or pass explicitly: drawBitmap(bitmap, x, y, pageWidth,
-      // pageHeight, 0, 0)
       renderer.drawBitmap(bitmap, x, y, pageWidth, pageHeight, 0, 0);
 
-      // Draw UI hints on the base layer
       GUI.drawButtonHints(renderer, labels.btn1, labels.btn2, labels.btn3, labels.btn4);
-      // Single pass for non-grayscale images
 
       renderer.displayBuffer(HalDisplay::FAST_REFRESH);