Allow Google Analytics and Ads domains in CSP

Add to connect-src: analytics.google.com, www.google.com,
www.googletagmanager.com — required for GA event beacons and
Google Ads conversion/remarketing collect endpoints.

Add to script-src: googleads.g.doubleclick.net — required for
Google Ads conversion tag script injection via GTM.

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://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\"}"
+    + "\"Content-Security-Policy\":\"default-src 'self'; script-src 'self' 'unsafe-inline' 'unsafe-eval' https://challenges.cloudflare.com https://cdn.jsdelivr.net https://googleads.g.doubleclick.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://analytics.google.com https://api.stripe.com https://*.supabase.co https://www.google.com https://www.googletagmanager.com; 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://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\"}"
+    + "\"Content-Security-Policy\":\"default-src 'self'; script-src 'self' 'unsafe-inline' 'unsafe-eval' https://challenges.cloudflare.com https://cdn.jsdelivr.net https://googleads.g.doubleclick.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://analytics.google.com https://api.stripe.com https://*.supabase.co https://www.google.com https://www.googletagmanager.com; 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://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\"}"
+    + "\"Content-Security-Policy\":\"default-src 'self'; script-src 'self' 'unsafe-inline' 'unsafe-eval' https://challenges.cloudflare.com https://cdn.jsdelivr.net https://googleads.g.doubleclick.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://analytics.google.com https://api.stripe.com https://*.supabase.co https://www.google.com https://www.googletagmanager.com; 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 {