Backend exposes account and plan as proper Inertia resources so any
page can read them off shared props:
- AuthAccountResource — id, name, created_at
- AuthPlanResource — id, slug, name, interval (derived from the active
Cashier subscription's stripe_price)
Both wired into HandleInertiaRequests::share so `auth.account` and
`auth.plan` are available everywhere.
Frontend pushes app + identity context to GTM's dataLayer on every
page load via initializeDataLayer (resources/js/datalayer.ts), and
useTracking gets begin_checkout/purchase wired in the billing flow.
The pushes are no-ops without GTM configured (the array still exists
in memory, nothing reads it). Self-hosted instances without GTM_ID
incur zero error noise. The GTM partials in app.blade.php were
already conditional on `config('services.gtm.id')`.
Processing.vue polls `auth` alongside `subscriptionActive` so
auth.plan.interval is fresh once the Stripe webhook creates the local
Subscription row (it doesn't exist yet at the initial render). The
watch fires only on the false → true transition; an onMounted
fallback redirects users that land on the page with an already-active
subscription without re-firing trackPurchase.
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