fix(#50): 🐛 Selecting a navigation tool with tab should work

src/Accessibility/makeMenuTabbable.js

@@ -251,18 +251,58 @@ function makeToolsPanelTabbable() {
 
   // Hide camera projection options as they are not supported
   const cameraProjection = document.getElementById('camera_projection_options');
-  cameraProjection.hidden = true
+  if (cameraProjection) cameraProjection.hidden = true
 
   // Make navigation tools tabbable and keyboard clickable
   const navigationTools = document.querySelectorAll(
     '#navigation img'
   )
+  const renderArea = document.querySelector('#potree_render_area')
+  // Keep wrapper focusable as a fallback target (doesn't change tab order elsewhere)
+  if (renderArea && !renderArea.hasAttribute('tabindex')) {
+    renderArea.setAttribute('tabindex', '0')
+  }
+
   navigationTools.forEach((img) => {
     img.tabIndex = 0
     img.addEventListener('keydown', (e) => {
       if (e.key === 'Enter' || e.key === ' ') {
         e.preventDefault()
         img.click()
+
+        // Switch controls directly via Potree API, then focus the keyboard input target (canvas)
+        const pv = window.potreeViewer || window.viewer || null
+        const target = renderArea
+        if (pv) {
+          const src = (img.getAttribute && img.getAttribute('src')) || ''
+          const title = img.getAttribute && (img.getAttribute('title') || img.getAttribute('data-i18n') || '')
+          const key = (src + ' ' + title).toLowerCase()
+
+          if (key.includes('earth')) {
+            pv.setControls(pv.earthControls)
+          } else if (key.includes('heli') || key.includes('helicopter')) {
+            pv.setControls(pv.fpControls)
+            if (pv.fpControls) pv.fpControls.lockElevation = true
+          } else if (key.includes('fps') || key.includes('flight') || key.includes('flight_control')) {
+            pv.setControls(pv.fpControls)
+            if (pv.fpControls) pv.fpControls.lockElevation = false
+          } else if (key.includes('orbit')) {
+            pv.setControls(pv.orbitControls)
+          }
+
+          const dom = pv && pv.renderer && pv.renderer.domElement
+          if (dom) {
+            if (!dom.hasAttribute('tabindex')) dom.setAttribute('tabindex', '-1')
+            dom.focus()
+          } else if (target) {
+            // conservative fallback
+            if (!target.hasAttribute('tabindex')) target.setAttribute('tabindex', '0')
+            target.focus()
+          }
+        } else if (target) {
+          if (!target.hasAttribute('tabindex')) target.setAttribute('tabindex', '0')
+          target.focus()
+        }
       }
     })
   })