website: point the testing-water Reserve link at the interest form

testing-water "Reserve now" now links to the testing-the-waters
indication-of-interest form (reserveUrl). The crowdfunding-full "Invest"
CTA keeps the Wefunder placeholder (wefunderUrl) until that page is live.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

website/.eleventy.js

@@ -98,7 +98,9 @@ module.exports = function (ty) {
   // Home first-section variant: "default" | "testing-water" | "crowdfunding-full".
   // Selects which hero index.html renders; "default" = the current site, untouched.
   ty.addGlobalData("homeHero", "default")
-  // TODO: replace with the live SimpleX campaign URL once the Wefunder page exists.
+  // testing-water "Reserve now" -> the testing-the-waters interest form
+  ty.addGlobalData("reserveUrl", "https://simplexchat.typeform.com/crowdfunding")
+  // crowdfunding-full "Invest" CTA -- placeholder until the Wefunder campaign page is live
   ty.addGlobalData("wefunderUrl", "https://wefunder.com/")
 
   ty.addShortcode("cfg", (name) => globalConfig[name])

website/src/_includes/hero-crowdfunding.html

@@ -19,7 +19,7 @@
             {%- if homeHero == 'testing-water' -%}
             <div class="cf-reserve">
                 <p class="cf-reserve-h">{{ "index-hero-cf-reserve-h" | i18n({}, lang) | safe }}
-                    <a class="gradient-text" href="{{ wefunderUrl }}" target="_blank" rel="noopener">{{ "index-hero-cf-reserve-cta" | i18n({}, lang) | safe }}</a>
+                    <a class="gradient-text" href="{{ reserveUrl }}" target="_blank" rel="noopener">{{ "index-hero-cf-reserve-cta" | i18n({}, lang) | safe }}</a>
                 </p>
                 <p class="cf-disclaimer">{{ "index-hero-cf-disclaimer" | i18n({}, lang) | safe }}</p>
             </div>