refactor(companion): extract drawRowSelection() for the canonical list-row bar

Every drawList/AccordionList row opened with the same hand-written
display.drawSelectionRow(0, y-1, width-reserve, lineStep-1, sel) line —
14 copies of the same geometry and magic offsets. Add a drawRowSelection(d,
y, sel, reserve) helper in icons.h next to drawList and route the canonical
sites through it (Bot/LiveShare/Locator/Repeater/Settings/Tools/Nearby/
QuickMsg/Waypoints).

Rows that intentionally differ (full-width DashboardConfig/QuickMsg, the
keyboard/ringtone grids) keep their explicit drawSelectionRow() call — the
helper is opt-in rather than baked into drawList, so legitimate variants
aren't forced into one geometry. Framework doc updated to match.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

examples/companion_radio/ui-new/SettingsScreen.h

@@ -422,7 +422,7 @@ class SettingsScreen : public UIScreen {
   void renderItem(DisplayDriver& display, int item, int y, bool sel) {
     NodePrefs* p = _task->getNodePrefs();
 
-    display.drawSelectionRow(0, y - 1, display.width() - _reserve, display.lineStep() - 1, sel);
+    drawRowSelection(display, y, sel, _reserve);
 
     display.setCursor(2, y);
 
@@ -671,7 +671,7 @@ public:
       [&](int sec, int y, bool sel, int reserve, bool collapsed) {
         _reserve = reserve;
         display.setColor(DisplayDriver::LIGHT);
-        display.drawSelectionRow(0, y - 1, display.width() - reserve, display.lineStep() - 1, sel);
+        drawRowSelection(display, y, sel, reserve);
         display.setCursor(2, y);
         display.print(collapsed ? "+" : "-");
         display.print(" ");