Mark head follow as experimental

It works but is only lightly tested, and what's left is mostly tuning its
settings. Frametop Input Settings now says so under the Head follow switch,
and the README, design notes, and button action name say it too.

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

input-settings/ft_input_settings.py

@@ -38,7 +38,7 @@ ACTION_LABELS = {
     "left": "Left click", "right": "Right click", "middle": "Middle click", "back": "Back",
     "scroll_up": "Scroll up", "scroll_down": "Scroll down", "dashboard": "Toggle SteamVR dashboard",
     "recenter": "Recenter pointer", "pointer_toggle": "Pointer on/off",
-    "follow_toggle": "Head follow on/off", "sens_up": "Faster pointer",
+    "follow_toggle": "Head follow on/off (experimental)", "sens_up": "Faster pointer",
     "sens_down": "Slower pointer", "layout_reset": "Reset desktop screen layout",
     "screens_toggle": "Hide/show desktop screens", "key": "Pass through as key",
     "none": "Do nothing",

input-settings/main.qml

@@ -316,10 +316,19 @@ Kirigami.ApplicationWindow {
             Kirigami.FormLayout {
                 Controls.Switch {
                     Kirigami.FormData.label: "Head follow:"
-                    text: "Pointer follows your head (leash below; 0° locks it to your view)"
+                    text: "Pointer follows your head (experimental; leash below, 0° locks it to your view)"
                     checked: backend.pointerFollow
                     onToggled: backend.setPointerFollow(checked)
                 }
+                Kirigami.InlineMessage {
+                    Layout.fillWidth: true
+                    Layout.maximumWidth: Kirigami.Units.gridUnit * 30
+                    visible: true
+                    type: Kirigami.MessageType.Warning
+                    text: "Head follow is experimental. It's only lightly tested and not finished: the head "
+                          + "follow settings below are a starting point, and polishing how it feels is left open "
+                          + "for anyone who wants to take it further."
+                }
                 Repeater {
                     model: backend.pointerSettings
                     delegate: RowLayout {