Open buy buttons in CrowdRepublic crowdfunding modal.

Replace donate.stream links with a modal announcing the upcoming campaign on CrowdRepublic, with RU/EN copy and the old buy URL commented out.

Co-authored-by: Cursor <cursoragent@cursor.com>

src/main.tsx

@@ -3,6 +3,7 @@ import { createRoot } from "react-dom/client";
 
 import { App } from "./App";
 import { LocaleProvider } from "./i18n/LocaleProvider";
+import { CrowdfundingModalProvider } from "./providers/CrowdfundingModalProvider";
 import { ExchangeRateProvider } from "./providers/ExchangeRateProvider";
 import "./styles/global.css";
 
@@ -15,7 +16,9 @@ createRoot(rootEl).render(
   <StrictMode>
     <LocaleProvider>
       <ExchangeRateProvider>
-        <App />
+        <CrowdfundingModalProvider>
+          <App />
+        </CrowdfundingModalProvider>
       </ExchangeRateProvider>
     </LocaleProvider>
   </StrictMode>,