harden secure chat frontend v1

[creativaPoeta]

Summary

Frontend hardening for secure_dm_v1 direct messages:

• removes private-key localStorage fallback and keeps secure device state in IndexedDB
• adds identity pinning and a fingerprint verification dialog
• refreshes signed prekeys and replenishes one-time prekeys
• sends encrypted text and encrypted media in secure chats
• decrypts secure media client-side before preview/download
• adds secure device management in settings
• redacts secure chat foreground notifications
• blocks plaintext reactions for secure chats
• adds secure media crypto smoke coverage

Validation

• npm.cmd run type-check
• npm.cmd run test:e2ee-media

Rollout Notes

Keep this as a draft until the backend PR is reviewed with it.

Backend must be deployed first with:

• E2EE endpoints
• DB migration
• both old and new Netlify origins temporarily allowed

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