fix(intro): hold companion popup until dashboard reveal cinematic ends

The remote-companion popup fired on a blind 5s timer while the
first-visit dashboard entrance cinematic runs for 8s, so on a fresh
install it appeared mid-reveal and broke the intro. The cinematic now
publishes an introCinematicPlaying flag via the loginTransition store,
and the popup waits for it to clear (plus a 2s grace) before showing.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

neode-ui/src/views/Dashboard.vue

@@ -373,6 +373,7 @@ onMounted(() => {
     // un-forced call would gate itself silent.
     playDashboardLoadOomph(true)
     showZoomIn.value = true
+    loginTransition.setIntroCinematicPlaying(true)
     loginTransition.setPendingWelcomeTyping(true)
     loginTransition.setJustCompletedOnboarding(false)
     loginTransition.setJustLoggedIn(false)
@@ -383,7 +384,10 @@ onMounted(() => {
     scheduledTimeout(triggerRevealGlitch, 500)
     scheduledTimeout(triggerRevealGlitch, 1200)
     scheduledTimeout(triggerRevealGlitch, 2000)
-    scheduledTimeout(() => { showZoomIn.value = false }, 8000)
+    scheduledTimeout(() => {
+      showZoomIn.value = false
+      loginTransition.setIntroCinematicPlaying(false)
+    }, 8000)
     scheduledTimeout(() => {
       loginTransition.setStartWelcomeTyping(true)
       loginTransition.setPendingWelcomeTyping(false)
@@ -405,6 +409,9 @@ onMounted(() => {
 
 onBeforeUnmount(() => {
   document.body.classList.remove('dashboard-active')
+  // Timers are cleared below; make sure overlays waiting on the cinematic
+  // aren't left blocked forever if we unmount mid-reveal.
+  loginTransition.setIntroCinematicPlaying(false)
   window.removeEventListener('keydown', handleKioskShortcuts)
   for (const id of pendingTimers) clearTimeout(id)
   pendingTimers.length = 0