[ryder777777]

What this does

Implements lib/analytics/add-a-strict-content-security.ts (evaluateAddAStrictContentSecurity) and Vitest unit tests in lib/analytics/__tests__/add-a-strict-content-security.test.ts for Add a strict Content-Security-Policy with nonces and Trusted Types.

Closes #115

Checklist

• npm run check:bindings, npm run typecheck, npm run lint, npm test and npm run build pass
• No secrets: no .env files, keys or seeds; nothing secret in a NEXT_PUBLIC_* variable
• Docs updated where behaviour or config changed
• On-chain amounts stay bigint base units end to end

How this was tested

Ran Vitest unit tests (npx vitest run) and npm run typecheck locally across nominal, elevated, critical, and invalid input boundary cases.

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