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/hudLayoutPolicy.js

@@ -0,0 +1,7 @@
+/** Browser-free layout vocabulary shared by UI and server-side voice tools. */
+export const HUD_LAYOUTS = Object.freeze([
+  'tactical',
+  'operator',
+  'minimal',
+  'cyber',
+]);