Remove all trackers (Umami, Cloudflare, insights-js) from cookie consent

Strip loadAnalytics, loadCloudflareTunnel and insights-js dependency.
Cookie consent banner kept for future use without any tracking scripts.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

package.json

@@ -35,7 +35,6 @@
         "@sentry/browser": "^10.38.0",
         "@tailwindcss/vite": "^4.1.18",
         "autoprefixer": "^10.4.24",
-        "insights-js": "^1.2.11",
         "tailwindcss": "^4.1.18",
         "vite-plugin-compression": "^0.5.1",
         "vite-plugin-favicon": "^1.0.8"