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/stores/loginTransition.ts

@@ -15,6 +15,12 @@ export const useLoginTransitionStore = defineStore('loginTransition', () => {
   const pendingWelcomeTyping = ref(false)
   /** Trigger welcome typing on Home - set true after dashboard animation finishes */
   const startWelcomeTyping = ref(false)
+  /**
+   * True while the dashboard entrance cinematic (zoom/glitch reveal) is
+   * playing. Overlays that would visually compete with it (e.g. the
+   * companion intro popup) hold off until this flips back to false.
+   */
+  const introCinematicPlaying = ref(false)
 
   function setJustLoggedIn(value: boolean) {
     justLoggedIn.value = value
@@ -32,6 +38,10 @@ export const useLoginTransitionStore = defineStore('loginTransition', () => {
     startWelcomeTyping.value = value
   }
 
+  function setIntroCinematicPlaying(value: boolean) {
+    introCinematicPlaying.value = value
+  }
+
   return {
     justLoggedIn,
     setJustLoggedIn,
@@ -41,5 +51,7 @@ export const useLoginTransitionStore = defineStore('loginTransition', () => {
     setPendingWelcomeTyping,
     startWelcomeTyping,
     setStartWelcomeTyping,
+    introCinematicPlaying,
+    setIntroCinematicPlaying,
   }
 })