Fix SyntaxError in account-dashboard and expand CSP

Replace ternary operator in native_js block with explicit if-else —
El's parser chokes on '?' adjacent to single-quoted strings inside
native_js(), causing an Uncaught SyntaxError that prevents the entire
IIFE from running and leaves signInWith undefined.

Add missing CSP entries to all three header functions:
- js.stripe.com → script-src and frame-src (Stripe JS and Elements iframe)
- fonts.googleapis.com → style-src (Google Fonts CSS)
- fonts.gstatic.com → font-src (Google Fonts files)
- static.cloudflareinsights.com → script-src (Cloudflare beacon)

src/js/account-dashboard.el

@@ -105,9 +105,9 @@ fn main() -> Void {
 
     var devicesEl = document.getElementById('devices-count-el');
     if (devicesEl) {
-      devicesEl.textContent = (plan === 'free')
-        ? '1 device included with your plan'
-        : '2 devices included with your plan';
+      var deviceText = '2 devices included with your plan';
+      if (plan === 'free') { deviceText = '1 device included with your plan'; }
+      devicesEl.textContent = deviceText;
     }
 
     var meta = '';

src/main.el

@@ -2317,7 +2317,7 @@ fn sec_headers_json() -> String {
     + "\"X-Frame-Options\":\"SAMEORIGIN\","
     + "\"Referrer-Policy\":\"strict-origin-when-cross-origin\","
     + "\"Permissions-Policy\":\"geolocation=(), microphone=(), camera=()\","
-    + "\"Content-Security-Policy\":\"default-src 'self'; script-src 'self' 'unsafe-inline' 'unsafe-eval' https://challenges.cloudflare.com https://cdn.jsdelivr.net https://www.googletagmanager.com https://www.google-analytics.com; style-src 'self' 'unsafe-inline'; frame-src https://challenges.cloudflare.com; connect-src 'self' https://api.stripe.com https://*.supabase.co; img-src 'self' data: https:; font-src 'self' data:\"}"
+    + "\"Content-Security-Policy\":\"default-src 'self'; script-src 'self' 'unsafe-inline' 'unsafe-eval' https://challenges.cloudflare.com https://cdn.jsdelivr.net https://js.stripe.com https://static.cloudflareinsights.com https://www.googletagmanager.com https://www.google-analytics.com; style-src 'self' 'unsafe-inline' https://fonts.googleapis.com; frame-src https://challenges.cloudflare.com https://js.stripe.com; connect-src 'self' https://api.stripe.com https://*.supabase.co; img-src 'self' data: https:; font-src 'self' data: https://fonts.gstatic.com\"}"
 }
 
 // Headers for compiled JS assets. Explicitly sets Content-Type so the browser
@@ -2333,7 +2333,7 @@ fn js_headers_json() -> String {
     + "\"X-Frame-Options\":\"SAMEORIGIN\","
     + "\"Referrer-Policy\":\"strict-origin-when-cross-origin\","
     + "\"Permissions-Policy\":\"geolocation=(), microphone=(), camera=()\","
-    + "\"Content-Security-Policy\":\"default-src 'self'; script-src 'self' 'unsafe-inline' 'unsafe-eval' https://challenges.cloudflare.com https://cdn.jsdelivr.net https://www.googletagmanager.com https://www.google-analytics.com; style-src 'self' 'unsafe-inline'; frame-src https://challenges.cloudflare.com; connect-src 'self' https://api.stripe.com https://*.supabase.co; img-src 'self' data: https:; font-src 'self' data:\"}"
+    + "\"Content-Security-Policy\":\"default-src 'self'; script-src 'self' 'unsafe-inline' 'unsafe-eval' https://challenges.cloudflare.com https://cdn.jsdelivr.net https://js.stripe.com https://static.cloudflareinsights.com https://www.googletagmanager.com https://www.google-analytics.com; style-src 'self' 'unsafe-inline' https://fonts.googleapis.com; frame-src https://challenges.cloudflare.com https://js.stripe.com; connect-src 'self' https://api.stripe.com https://*.supabase.co; img-src 'self' data: https:; font-src 'self' data: https://fonts.gstatic.com\"}"
 }
 
 // Headers for static assets under /assets/ and /brand/.
@@ -2349,7 +2349,7 @@ fn static_asset_headers_json() -> String {
     + "\"X-Frame-Options\":\"SAMEORIGIN\","
     + "\"Referrer-Policy\":\"strict-origin-when-cross-origin\","
     + "\"Permissions-Policy\":\"geolocation=(), microphone=(), camera=()\","
-    + "\"Content-Security-Policy\":\"default-src 'self'; script-src 'self' 'unsafe-inline' 'unsafe-eval' https://challenges.cloudflare.com https://cdn.jsdelivr.net https://www.googletagmanager.com https://www.google-analytics.com; style-src 'self' 'unsafe-inline'; frame-src https://challenges.cloudflare.com; connect-src 'self' https://api.stripe.com https://*.supabase.co; img-src 'self' data: https:; font-src 'self' data:\"}"
+    + "\"Content-Security-Policy\":\"default-src 'self'; script-src 'self' 'unsafe-inline' 'unsafe-eval' https://challenges.cloudflare.com https://cdn.jsdelivr.net https://js.stripe.com https://static.cloudflareinsights.com https://www.googletagmanager.com https://www.google-analytics.com; style-src 'self' 'unsafe-inline' https://fonts.googleapis.com; frame-src https://challenges.cloudflare.com https://js.stripe.com; connect-src 'self' https://api.stripe.com https://*.supabase.co; img-src 'self' data: https:; font-src 'self' data: https://fonts.gstatic.com\"}"
 }
 
 fn handle_request(method: String, path: String, headers: Map, body: String) -> String {