[MWPW-199709] Conditionally hide Register CTA in C2 GNAV based on registration status

[maagrawal16]

Added first-class support in the C2 GNAV library for hiding a CTA (e.g. MAX'26's "Register" button) once the visitor is confirmed registered for the event.

How it works

• Authoring — append #_hide-when-registered to the CTA's link href in DA, the same lightweight convention as the existing #_blank suffix. No new authoring UI.
• Render — primaryCTA/secondaryCTA strip the suffix (keeping the real URL clean) and stamp a data-feds-hide-when-registered marker on the anchor.
• Gating — after render, initEventRegistrationGating consumes the events platform's registration signal and removes the CTA's wrapper (<li> or .feds-product-entry-cta, falling back to the link itself) when isRegistered is true.

Registration signal — event-driven

Verified against da-events registration-cache.js: the platform dispatches registration:resolved on window (detail { isRegistered, inPersonAttendee }) before it assigns window.events. GNAV can render on either side of that, so the gating uses a race-free check-else-listen:

• rendered late → window.events already exists, call getRegistrationStatus() directly;
• rendered early → subscribe once to registration:resolved and read event.detail.

Because the event fires before window.events is assigned, a synchronous "is window.events there?" check that sees nothing proves the event hasn't fired yet, so the { once: true } listener will catch it.

Scope / safety

• Gated entirely behind event-code metadata — non-event pages (the vast majority of adobe.com using this shared GNAV) short-circuit after metadata read and never touch window.events.
• Fire-and-forget: never awaited in GNAV's render/promise path, so nav LCP/TBT are unaffected.
• No new network calls — rides on da-events' already-memoized/cached lookup.

Files

• src/Utils/Utils.ts — getRegistrationGateAttrs helper + HIDE_WHEN_REGISTERED_SUFFIX
• src/Components/CTA/Render.ts — stamps the data-feds-hide-when-registered marker
• src/types/adobe-window.d.ts — types the window.events global
• src/PostRendering/EventRegistration.ts — the event-driven gating logic (new)
• src/Main.ts — wires initEventRegistrationGating into postRenderingTasks
• dist/main.js / dist/main.js.map — rebuilt bundle
• Tests — test/Utils/RegistrationGate.test.js, test/Components/CTA/Render.test.js, test/PostRendering/EventRegistration.test.js

Testing

• Unit: full suite green (261 passing), lint + typecheck clean.
• Manual: verified end-to-end with two real accounts on the test page:
  • Registered — vevent+max2025-registered@adobetest.com (provided by hnv@adobe.com): Register CTA is hidden.
  • Not registered — maagrawal@adobe.com (my own LDAP): Register CTA remains visible.

Test pages:

• Event page (MAX'26 C2 GNAV):
  Dark: https://main--da-events-fg-pink--adobecom.aem.page/max/2026/drafts/maagrawal/c2-gnav-test-dark?fedsbranch=MWPW-199709
  Light: https://main--da-events-fg-pink--adobecom.aem.page/max/2026/drafts/maagrawal/c2-gnav-test-light?fedsbranch=MWPW-199709
• GNAV fragment: http://main--federal--adobecom.aem.page/federal/dev/maagrawal/poc-gnav-6

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