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Jeremy Daer
99266973fd
Layer a Turbo-safe nonce and a full directive set onto the Report-Only baseline, still without enforcing anything. The nonce is the HMAC-SHA256 of a stable per-visitor cookie, keyed by secret_key_base. It stays constant across a session's requests so Turbo snapshot restores don't replay a stale nonce and trip the policy, while staying unpredictable to a client that can set the cookie but not the secret. importmap-rails auto-nonces the importmap JSON and shim, the only inline scripts the app renders (the message _template is a non-executed text/template data block). script-src gains the nonce; style-src keeps unsafe_inline for now (inline style= attributes across the composer and ActionText content aren't nonceable yet); img/connect/frame-src start at :self as tuning starting points for the report-only window. report_only stays true; enforcement is a later flip.