Reword code comments in plain technical language

Comments only, no code changes. Replaces vague or personified phrasing
with explicit statements of what the code does and why, uses bullet
lists for multi-case behavior, and fixes the settings path in
WindowSettings.h (~/.config/sloposk/sloposk.conf).

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

qml/DragHandle.qml

@@ -1,11 +1,11 @@
 import QtQuick
 
-// The grab bar under the floating keyboard. Moving the window is up to the
-// owner (the window manager's move, so it works for mouse and touch alike).
+// Grab bar below the keyboard. Only emits dragStarted(); the parent starts
+// the window manager's move (works for mouse and touch).
 Item {
     id: handle
 
-    // Narrower when the bar's buttons leave less room in the middle.
+    // Set smaller when the bar's buttons take up more width.
     property real pillWidth: 120
     signal dragStarted()