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/SliderRow.qml

@@ -1,6 +1,6 @@
 import QtQuick
 
-// A labelled slider in the iOS style; value runs from `from` to 1.
+// iOS-style labelled slider; value range is `from`..1.
 Item {
     id: row