fix: preserve keyboard focus and separate Space activation from voice

Keep focus visible across controls and stable during Contacts, Cockpit and mission roster updates. Preserve native short Space activation, and claim push-to-talk only after a 500 ms hold. Add panel Escape handling and keyboard-accessible attribution controls.

Retains the Map Source foundation contributed in https://github.com/bilawalsidhu/gods-eye-view/pull/171.

CHANGELOG.md

@@ -13,6 +13,49 @@ of current runtime behavior, see [`docs/CURRENT-STATE.md`](docs/CURRENT-STATE.md
 
 ## [Unreleased]
 
+- Keyboard focus rings now survive active/selected button styles across the
+  interface. Visual Styles, Location cities and points of interest, search,
+  Context/mission actions, Cockpit utilities, and sliders retain a distinct
+  focus indicator.
+- A short Space press activates a focused control only on key release. Holding
+  Space for 500 ms blurs that control before push-to-talk starts, and release is
+  then consumed so it cannot also activate the old control. The same hold works
+  from the map or page background; text-entry controls remain protected.
+- The Location disclosure is reachable with Tab and shows keyboard focus;
+  its city, point-of-interest, and search controls do too. Escape from inside
+  the tray returns focus to its disclosure and discards any unfinished search;
+  Escape on the disclosure itself closes the tray and clears that focus.
+- Data Layers ON/OFF buttons show a keyboard focus ring independently of
+  their enabled and feed-status colors.
+- Display buttons, layout selectors, mode buttons, and sliders show a visible
+  keyboard focus ring, including the controls used in Cockpit Display. Enabled
+  CCTV camera dropdowns also show keyboard focus.
+- Context tabs keep a distinct keyboard ring when selected. Their existing
+  Left/Right arrow navigation continues to switch Contacts and Space Missions,
+  and both choices remain reachable through ordinary Tab navigation.
+- Tabbing through the Space Missions roster now drives the same temporary globe
+  rotation and mission-marker highlight as pointer hover, without selecting the
+  mission. Keyboard and pointer previews no longer cancel each other.
+- Radio power controls, Search Nearby Sites, and Clear Selected Layers retain
+  keyboard focus while their async work is busy. They expose that busy state to
+  assistive technology and ignore repeated activation until the work settles.
+- Live Contacts results retain keyboard focus by contact identity when counts,
+  distance order, or pages refresh. If a focused contact departs or rotates off
+  the visible page, focus moves to the named explanatory note at the end of the
+  list and survives later refreshes there, so the next Tab proceeds beyond the
+  list instead of restarting at Contacts or silently selecting another contact.
+- Cockpit Live Signals retains keyboard focus during live updates and contact
+  reordering, allowing Tab to continue to Display and Radio. If the focused
+  contact leaves the list, focus moves to the current briefing tab.
+- Cockpit-only Display and Radio launchers show complete inset focus rings.
+- Escape collapses the nearest expanded panel containing keyboard focus and
+  returns focus to that panel's disclosure when closing from its contents.
+  Escape on the disclosure itself closes without leaving the collapsed control
+  focused. Cockpit Contact and Live Signals panels follow the same nesting rule.
+- Cesium's bottom-left Data attribution control and lightbox Close control are
+  in the Tab order and support Enter and Space. Close, Escape, and backdrop
+  dismissal restore focus and synchronize the disclosure state.
+
 - CCTV testing uses the normal launcher for keyless startup, credential loading,
   localhost binding, and explicit LAN-exposure warnings while retaining its
   smaller source-pack limits.