feat: convert ConnectionModal to /connection page with crypto deep links

- Add @kastov/cryptohapp + jsencrypt for encrypted Happ deep links
- Add templateEngine utility to resolve {{SUBSCRIPTION_LINK}},
  {{HAPP_CRYPT3_LINK}}, {{HAPP_CRYPT4_LINK}}, {{USERNAME}} templates
- Convert ConnectionModal component into a standalone Connection page
- Add /connection route with ProtectedRoute and lazy loading
- Replace modal invocation in Dashboard and Subscription with
  navigate('/connection')
- Add type and svgIconKey optional fields to RemnawaveButton
- Show button type badge and SVG icon in AdminApps BlockCard
- Refactor ThemeTab to use local draft state with Save/Cancel flow

src/utils/templateEngine.ts

@@ -0,0 +1,32 @@
+import { createHappCryptoLink } from '@kastov/cryptohapp';
+
+const TEMPLATE_RE = /\{\{[A-Z0-9_]+\}\}/;
+
+export function hasTemplates(url: string): boolean {
+  return TEMPLATE_RE.test(url);
+}
+
+interface ResolveContext {
+  subscriptionUrl: string;
+  username?: string;
+}
+
+export function resolveTemplate(template: string, ctx: ResolveContext): string {
+  let result = template;
+
+  result = result.replace(/\{\{SUBSCRIPTION_LINK\}\}/g, ctx.subscriptionUrl);
+
+  if (ctx.username) {
+    result = result.replace(/\{\{USERNAME\}\}/g, ctx.username);
+  }
+
+  result = result.replace(/\{\{HAPP_CRYPT3_LINK\}\}/g, () => {
+    return createHappCryptoLink(ctx.subscriptionUrl, 'v3', true) ?? ctx.subscriptionUrl;
+  });
+
+  result = result.replace(/\{\{HAPP_CRYPT4_LINK\}\}/g, () => {
+    return createHappCryptoLink(ctx.subscriptionUrl, 'v4', true) ?? ctx.subscriptionUrl;
+  });
+
+  return result;
+}