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]>

docs/CURRENT-STATE.md

@@ -1,5 +1,42 @@
 # God's Eye View Current State
 
+## Cyber HUD — September 23, 2026
+
+Display > HUD > Layout includes Cyber, also available through the HUD voice
+action and shared visual state. An explicit first transition into Cyber selects
+FLIR with Ironbow 0.42; restored links and subsequent visual tuning remain
+authoritative. The skin uses shared red/slate panel treatments in map and cockpit,
+with compact 200px collapsed controls and wider expanded panels. Other HUD
+layouts retain their existing presentation.
+Chamfered panel expand/collapse controls use an inset keyboard-focus outline and
+red hover border in both map and cockpit, so clipping does not hide the highlight.
+
+Cyber's map-side right rail opens one panel at a time while keeping collapsed
+launchers available. Display, CCTV and Context scroll their contents inside fixed
+headers and decorative frames. The narrow-screen rail remains scrollable to reach
+each panel. Radio retains the shared nested Context player and compact
+header disclosure, without relocating playback controls on theme changes.
+
+Sonar has one contact-highlighting method. Native Cesium points, billboards and
+labels are treated in GPU draw commands without replacing their positions,
+identities or pick commands. Model and canvas/DOM overlays retain their own
+rendering paths. Sonar OFF stops the sweep while retaining Cyber's neutral
+contact treatment. Reduced motion disables the animated sweep; cockpit and
+hidden HUD states do not apply the map treatment. If the native shader is not
+supported, native contacts remain available and Display reports the limitation.
+No CSS scene-dimming fallback or effect selector is exposed.
+
+The Sonar controls adjust rings, range, power, opacity and sector. Sweep opacity
+affects detection painting rather than label cohort admission. Theme exit and
+renderer teardown release the derived GPU resources and restore owned model
+colors without replacing newer layer-owned color changes.
+
+The `set_cyber_sonar` voice action adjusts the same controls without switching
+themes or enabling omitted settings. State readback distinguishes configured
+settings from active map/contact effects. Sonar settings are session-only and
+return to their defaults on reload. Sliders accept integer values matching the
+action's ranges.
+
 Wind appears in the Weather group before Utilities. The surface-weather prototype
 uses keyless NOAA GFS or ECMWF IFS forecasts on an approximately 1° display grid.
 It defaults to 10 m wind trails over the existing basemap. Speed shading is an explicit choice; earlier v2 links retain their original speed-shading meaning.
@@ -1013,7 +1050,7 @@ Non-object or array-valued properties reject the response instead of being treat
 
 Launch payloads with missing records now say PAYLOAD DATA UNAVAILABLE. Missing names use Unnamed payload; absent or invalid mass stays unknown instead of appearing as 0 KG.
 
-Updated: September 15, 2026
+Updated: September 23, 2026
 
 ## Aircraft and vessel server modules