fix(security): allow vercel.live and *.vercel.app in CSP for preview deployments (#1887)

Vercel preview toolbar and preview URLs were blocked by missing CSP entries.
Both the meta tag (index.html) and HTTP header (vercel.json) must be in sync
since browsers enforce all active policies simultaneously.

- Add sha256-903UI9... hash to index.html script-src (was in vercel.json only,
  causing production inline script blocks from the meta tag policy)
- Add https://vercel.live and https://*.vercel.app to frame-src in both files
- Add https://vercel.live and https://*.vercel.app to frame-ancestors in vercel.json

vercel.json

@@ -34,7 +34,7 @@
         { "key": "Strict-Transport-Security", "value": "max-age=63072000; includeSubDomains; preload" },
         { "key": "Referrer-Policy", "value": "strict-origin-when-cross-origin" },
         { "key": "Permissions-Policy", "value": "camera=(), microphone=(), geolocation=(self), accelerometer=(), autoplay=(self \"https://www.youtube.com\" \"https://www.youtube-nocookie.com\"), bluetooth=(), display-capture=(), encrypted-media=(self \"https://www.youtube.com\" \"https://www.youtube-nocookie.com\"), gyroscope=(), hid=(), idle-detection=(), magnetometer=(), midi=(), payment=(), picture-in-picture=(self \"https://www.youtube.com\" \"https://www.youtube-nocookie.com\"), screen-wake-lock=(), serial=(), usb=(), xr-spatial-tracking=()" },
-        { "key": "Content-Security-Policy", "value": "default-src 'self'; connect-src 'self' https: wss: blob: data:; img-src 'self' data: blob: https:; style-src 'self' 'unsafe-inline' https://fonts.googleapis.com; script-src 'self' 'sha256-LnMFPWZxTgVOr2VYwIh9mhQ3l/l3+a3SfNOLERnuHfY=' 'sha256-4Z2xtr1B9QQugoojE/nbpOViG+8l2B7CZVlKgC78AeQ=' 'sha256-903UI9my1I7mqHoiVeZSc56yd50YoRJTB2269QqL76w=' 'wasm-unsafe-eval' https://www.youtube.com https://static.cloudflareinsights.com https://vercel.live https://challenges.cloudflare.com; worker-src 'self' blob:; font-src 'self' data: https:; media-src 'self' data: blob: https:; frame-src 'self' https://worldmonitor.app https://tech.worldmonitor.app https://finance.worldmonitor.app https://commodity.worldmonitor.app https://happy.worldmonitor.app https://www.youtube.com https://www.youtube-nocookie.com https://webcams.windy.com https://challenges.cloudflare.com; frame-ancestors 'self' https://www.worldmonitor.app https://tech.worldmonitor.app https://finance.worldmonitor.app https://commodity.worldmonitor.app https://happy.worldmonitor.app https://worldmonitor.app; base-uri 'self'; object-src 'none'; form-action 'self'" }
+        { "key": "Content-Security-Policy", "value": "default-src 'self'; connect-src 'self' https: wss: blob: data:; img-src 'self' data: blob: https:; style-src 'self' 'unsafe-inline' https://fonts.googleapis.com; script-src 'self' 'sha256-LnMFPWZxTgVOr2VYwIh9mhQ3l/l3+a3SfNOLERnuHfY=' 'sha256-4Z2xtr1B9QQugoojE/nbpOViG+8l2B7CZVlKgC78AeQ=' 'sha256-903UI9my1I7mqHoiVeZSc56yd50YoRJTB2269QqL76w=' 'wasm-unsafe-eval' https://www.youtube.com https://static.cloudflareinsights.com https://vercel.live https://challenges.cloudflare.com; worker-src 'self' blob:; font-src 'self' data: https:; media-src 'self' data: blob: https:; frame-src 'self' https://worldmonitor.app https://tech.worldmonitor.app https://finance.worldmonitor.app https://commodity.worldmonitor.app https://happy.worldmonitor.app https://www.youtube.com https://www.youtube-nocookie.com https://webcams.windy.com https://challenges.cloudflare.com https://vercel.live https://*.vercel.app; frame-ancestors 'self' https://www.worldmonitor.app https://tech.worldmonitor.app https://finance.worldmonitor.app https://commodity.worldmonitor.app https://happy.worldmonitor.app https://worldmonitor.app https://vercel.live https://*.vercel.app; base-uri 'self'; object-src 'none'; form-action 'self'" }
       ]
     },
     {