feat(hud): Cyber HUD theme with GPU contact sonar (#706)

Add the opt-in Cyber HUD layout with coordinated map and cockpit panel
styling, GPU-only contact sonar (rings, range, power, opacity, sector) with
native-rendering fallback, and set_cyber_sonar voice controls. Sonar visual
style inspired by kk376's tactical naval sonar (#214).

Co-authored-by: Sameh Khamis <[email protected]>
Co-Authored-By: Claude Opus 5.5 (1M context) <[email protected]>

src/ui/displayPanelScroll.js

@@ -0,0 +1,6 @@
+/** Cyber keeps the frame fixed; other layouts retain their existing scroller. */
+export function displayPanelScroller(panel) {
+  return panel?.ownerDocument?.documentElement?.dataset.uiTheme === 'cyber'
+    ? panel.querySelector('.pp-panel-body') || panel
+    : panel;
+}