fix(dashboard): restore paid course payment modal on landing page (#737)

* fix(dashboard): restore paid course payment modal on landing page

Wire the existing PaymentModal back into the theme-based course landing
page. Paid course CTAs now open the name/email modal and redirect to the
configured payment link instead of navigating to the blocked enroll route.

Co-authored-by: Rotimi Best <[email protected]>

* fix(dashboard): reset payment modal on close without effect loop

Co-authored-by: Rotimi Best <[email protected]>

* docs: add Svelte 5 rerender and effect loop guidance to AGENTS.md

Co-authored-by: Rotimi Best <[email protected]>

* fix(dashboard): avoid double-applying discount on course landing pricing

Co-authored-by: Rotimi Best <[email protected]>

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Co-authored-by: Cursor Agent <[email protected]>
Co-authored-by: Rotimi Best <[email protected]>

packages/ui/src/custom/org-landing-page/course-landing-page.helpers.ts

@@ -8,7 +8,8 @@ export function alignHeroCtaWithPricing(
     ...hero,
     primaryAction: {
       label: pricing.ctaLabel,
-      href: pricing.ctaHref ?? '#pricing',
+      href: pricing.ctaOnclick ? undefined : (pricing.ctaHref ?? '#pricing'),
+      onclick: pricing.ctaOnclick,
       disabled: hero.primaryAction.disabled
     }
   };