umputun / secrets / 20531117463

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feat(paranoid): add client-side encryption UI for create and reveal flows

implement complete paranoid mode frontend:
- create flow: encrypt message client-side, append #key to URL
- reveal flow: fetch encrypted blob, decrypt with URL fragment key
- proper error handling: check Content-Type before decryption
- return HTTP 403/404 for errors in paranoid mode (not 200)
- e2e tests verify correct error messages (not "Decryption failed")

the server never sees plaintext in paranoid mode - all encryption
happens in the browser using Web Crypto API (AES-128-GCM).

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