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.

src/data/manager.js

@@ -2043,16 +2043,23 @@ export class DataLayerManager {
       count.textContent = layer.stats.count ? this._formatCount(layer.stats.count) : '—';
 
       const toggle = document.createElement('button');
+      toggle.type = 'button';
       toggle.className = `data-toggle-btn${layer.enabled ? ' active' : ''}`;
       this._syncToggleButton(toggle, layer);
       toggle.addEventListener('click', async () => {
-        toggle.disabled = true;
+        // Native `disabled` immediately evicts keyboard focus in Chromium. Keep
+        // the lifecycle control focusable while it is busy, and enforce the
+        // same single-flight interaction contract through ARIA instead.
+        if (toggle.getAttribute('aria-disabled') === 'true') return;
+        toggle.setAttribute('aria-disabled', 'true');
+        toggle.setAttribute('aria-busy', 'true');
         try {
           await this.setEnabled(layer.id, !this.isEnabled(layer.id), { origin: 'user' });
         } catch (error) {
           console.warn(`[Data] ${layer.id} toggle error:`, error);
         } finally {
-          toggle.disabled = false;
+          const current = this.getAll().find(({ id }) => id === layer.id);
+          if (current) this._syncToggleButton(toggle, current);
         }
       });
 
@@ -2266,7 +2273,12 @@ export class DataLayerManager {
     button.dataset.feedState = transitioning
       ? layer.lifecycleState
       : (uncertain ? 'uncertain' : feedState);
-    button.disabled = transitioning;
+    // A busy toggle remains the keyboard focus owner. `aria-disabled` plus the
+    // click guard above prevents repeat activation without the focus loss caused
+    // by native `disabled`.
+    button.disabled = false;
+    button.setAttribute('aria-disabled', String(transitioning));
+    button.setAttribute('aria-busy', String(transitioning));
     button.textContent = transitioning
       ? layer.lifecycleState.toUpperCase()
       : (uncertain ? 'UNCERTAIN' : (layer.enabled ? FEED_STATE_LABELS[feedState] : 'OFF'));