Standardize cursor chrome to fill-only across qs.Ui

CursorSurface defines the canonical cursor chrome: a tinted fill, no
border. Three components had inconsistent treatments that the recent
standardization pass left half-finished:

- PillButton kept a 1px foreground border on hot (cursor or hover)
  via a cursorBordered: true default.
- CursorPill specifically had to override cursorBordered: false to
  match the rest of the kit.
- ChoiceButton thickened its border to 2px on hasCursor, which mixed
  the cursor visual with the Tab-focus visual.

Drop the cursorBordered escape hatch from PillButton (no caller other
than CursorPill ever used it), drop CursorPill's now-redundant
override, and remove hasCursor from ChoiceButton's border.width
thickening. Update Toggle's class comment (it still claimed cursor
mirrored Tab focus, which f3ba5055 broke without updating the doc).

Now: hot/hasCursor = fill only, activeFocus = accent border ring,
selected/active = stronger fill or accent border per component
semantic. One canonical pattern across the kit.

shell/Ui/ChoiceButton.qml

@@ -18,8 +18,9 @@ Rectangle {
 
   // Panel-cursor flag. Same role as PillButton.hasCursor: panels that own
   // their own cursor state bind this to drive the keyboard highlight
-  // separately from real activeFocus. Visuals match the activeFocus look
-  // (foreground 2px border) so cursor and Tab focus read the same.
+  // separately from real activeFocus. Cursor renders as a fill only —
+  // CursorSurface is the canonical chrome — while Tab focus adds the
+  // accent border ring on top.
   property bool hasCursor: false
   property bool borderlessHighlight: false
 
@@ -48,7 +49,7 @@ Rectangle {
     ? accent
     : (activeFocus ? foreground : Qt.rgba(foreground.r, foreground.g, foreground.b, 0.4))
   border.width: borderlessHighlight ? (activeFocus ? 2 : 0)
-    : (selected ? 2 : (activeFocus || hasCursor ? 2 : 1))
+    : (selected ? 2 : (activeFocus ? 2 : 1))
 
   Behavior on color { ColorAnimation { duration: 100 } }
 

shell/Ui/CursorPill.qml

@@ -20,8 +20,6 @@ import QtQuick
 PillButton {
   id: root
 
-  cursorBordered: false
-
   signal hovered(bool isHovered)
 
   HoverHandler {

shell/Ui/PillButton.qml

@@ -38,10 +38,12 @@ Rectangle {
 
   // Persistent 1px foreground border at idle. Use for "primary" form buttons
   // (Save, Apply, + Add widget) so they read as buttons before the cursor
-  // hits them. The hot/cursor state paints its own 1px border, so changing
-  // this doesn't affect panel-pill visuals.
+  // hits them.
+  //
+  // The hot/cursor state is a fill only, matching CursorSurface's canonical
+  // chrome and the other panel primitives (Toggle, PanelActionButton). The
+  // accent border ring is reserved for Tab focus on `focusable` buttons.
   property bool bordered: false
-  property bool cursorBordered: true
 
   activeFocusOnTab: focusable
   Keys.onReturnPressed: if (focusable) root.clicked()
@@ -95,7 +97,6 @@ Rectangle {
     : hot ? hoverBackground
     : (active ? activeBackground : background)
   border.width: _showFocusRing ? Style.focusBorderWidth
-    : hot ? (cursorBordered ? 1 : 0)
     : (bordered ? 1 : 0)
   border.color: _showFocusRing ? Style.focusBorderColor : foreground
 

shell/Ui/Toggle.qml

@@ -6,9 +6,10 @@ import qs.Commons
 // flip `checked` in response (the component is stateless about the actual
 // value so it composes cleanly with model-driven UI).
 //
-// Focus styling follows the shared Style tokens (accent border + tinted
-// fill on activeFocus) so keyboard nav looks the same here as on
-// ChoiceButton and other focusable Ui components.
+// Cursor and focus styling match the rest of the kit: hasCursor (panel
+// keyboard cursor / mouse hover) is a fill only, mirroring CursorSurface;
+// activeFocus (Tab focus) adds the accent border ring on top via the
+// shared Style tokens.
 //
 // `rounded` auto-detects from Style.cornerRadius so the switch follows
 // the theme: pill shape on round-corners themes, square on sharp.
@@ -22,8 +23,8 @@ Rectangle {
 
   // Panel-cursor flag. Same role as PillButton.hasCursor / ChoiceButton.hasCursor:
   // panels with their own keyboard cursor bind this to drive the highlight
-  // separately from activeFocus. Visuals match the activeFocus look (accent
-  // border + tinted fill via Style tokens) so cursor and Tab focus read the same.
+  // separately from activeFocus. Renders as a tinted fill only — the accent
+  // border ring is reserved for Tab focus (activeFocus).
   property bool hasCursor: false
 
   // Switch shape follows the theme by default: pill on round, square on sharp.