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/SettingsPanel.qml

@@ -1,8 +1,8 @@
 import QtQuick
 import Sloposk
 
-// Replaces the keys while open, over the window's own background so
-// opacity changes show live. Binds straight to Settings, which persists.
+// Shown instead of the keys while open. Drawn on the window background, so
+// opacity changes are visible immediately. Bound directly to Settings, which saves to disk.
 Flickable {
     id: panel
 
@@ -113,7 +113,7 @@ Flickable {
                 }
 
                 Repeater {
-                    // "main" is the typing keys; the rest come from the template.
+                    // "main" = the typing keys; other ids are template sections.
                     model: [{ id: "main", name: qsTr("Typing keys") }].concat(panel.layoutModel.sections)
 
                     ToggleRow {