fix(ui): first-login dashboard entrance restored + working Replay Intro

- playDashboardLoadOomph gated itself silent on the one entry that
  should be loud: onboarding is already flagged complete by the time the
  post-wizard dashboard mounts. force flag restores the full oomph there
  while keeping ordinary re-logins quiet (the intentional limit).
- OnboardingDone now hands Login a one-shot finale flag, so the login
  right after the wizard gets the full zoom + oomph even as a regular
  password login — which is exactly the demo flow (and TOTP logins).
- 'Replay intro' on the login screen actually replays: App.vue was
  instantly re-marking the intro as seen on onboarded nodes; an explicit
  one-shot replay flag now overrides every suppression rule (unit
  tested).

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

neode-ui/src/utils/__tests__/introSplash.test.ts

@@ -28,4 +28,14 @@ describe('shouldShowIntroSplash', () => {
       onboardingComplete: null,
     })).toBe(false)
   })
+
+  it('an explicit replay request overrides every suppression rule', () => {
+    expect(shouldShowIntroSplash({
+      seenIntro: true,
+      routePath: '/',
+      fromBoot: false,
+      onboardingComplete: true,
+      replayRequested: true,
+    })).toBe(true)
+  })
 })

neode-ui/src/utils/introSplash.ts

@@ -4,9 +4,12 @@ export interface IntroSplashDecisionInput {
   fromBoot: boolean
   devMode?: string
   onboardingComplete: boolean | null
+  /** Explicit "Replay intro" click — overrides every suppression rule. */
+  replayRequested?: boolean
 }
 
 export function shouldShowIntroSplash(input: IntroSplashDecisionInput): boolean {
+  if (input.replayRequested) return true
   if (input.seenIntro) return false
   if (input.onboardingComplete === true) return false