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.

index.html

@@ -548,14 +548,16 @@
     <div class="panel-glow"></div>
     <div class="location-inner">
       <div class="location-toolbar">
-        <span class="location-toolbar-label"><span class="dock-label-icon dock-label-icon-location" aria-hidden="true"></span>LOCATION</span>
+        <button id="location-bar-toggle" class="dock-tray-toggle" type="button" data-dock-toggle-target="location-bar" aria-controls="location-bar-popover" aria-expanded="false" aria-label="Expand LOCATION" title="Expand LOCATION">
+          <span class="location-toolbar-label"><span class="dock-label-icon dock-label-icon-location" aria-hidden="true"></span>LOCATION</span>
+        </button>
         <button class="panel-collapse-btn" data-collapse-target="location-bar" title="Collapse panel">+</button>
       </div>
       <div id="location-mini-status" class="location-mini-status" aria-live="polite">
         <div id="location-mini-city" class="location-mini-city">📍 Location: --</div>
         <div id="location-mini-poi" class="location-mini-poi">Landmark: --</div>
       </div>
-      <div class="dock-popover-content">
+      <div id="location-bar-popover" class="dock-popover-content">
         <button class="dock-pin-btn" data-pin-target="location-bar" type="button" aria-label="Pin location tray" aria-pressed="false" title="Keep location tray open"><img src="/pin.svg" alt="" /></button>
         <div id="poi-row" class="poi-row-container"></div>
         <div class="location-bar-divider" id="location-bar-divider"></div>
@@ -727,7 +729,7 @@
             <span class="material-symbols-outlined" aria-hidden="true">radar</span>
             <span>CONTACTS</span>
           </button>
-          <button id="global-context-missions-btn" class="context-mode-button" type="button" role="tab" tabindex="-1" aria-selected="false" aria-controls="context-missions-view">
+          <button id="global-context-missions-btn" class="context-mode-button" type="button" role="tab" tabindex="0" aria-selected="false" aria-controls="context-missions-view">
             <span class="material-symbols-outlined" aria-hidden="true">rocket_launch</span>
             <span>SPACE MISSIONS</span>
           </button>
@@ -765,6 +767,7 @@
               <div class="space-mission-roster-list" data-mission-roster-list>
                 <div class="space-mission-roster-empty">LOADING 30-DAY MISSION INDEX</div>
               </div>
+              <p class="space-mission-roster-focus-continuation" tabindex="-1" data-mission-roster-focus-continuation>TAB PREVIEWS · ENTER / SPACE SELECTS</p>
             </div>
           </div>
         </section>