feat(frontend): fix #485 encrypted p2p messaging and #491 transaction simulator

[Dopezapha]

Closes #485
Closes #491

PR Description

Fixes #485 by adding browser-side end-to-end encrypted peer messaging for the collaboration hub. The new flow creates non-extractable Web Crypto keys in IndexedDB, verifies peer public-key fingerprints, derives per-conversation AES-GCM keys with ECDH and HKDF, and relays only encrypted payloads through the room transport.

Fixes #491 by adding a universal frontend transaction simulator for Stellar and EVM flows. Stellar transactions are simulated through RPC with fee-stat based buffers and readable state-change summaries, while EVM transactions use eth_call, eth_estimateGas, eth_feeHistory, and trace/debug RPCs when available for state diffs.

Changed

• [Frontend] Client-Side Encryption/Decryption Utility for P2P Messaging #485 Added P2P crypto utilities for ECDH, HKDF, AES-GCM, IndexedDB key storage, and peer fingerprint verification.
• [Frontend] Client-Side Encryption/Decryption Utility for P2P Messaging #485 Added encrypted room chat to the brainstorm collaboration page.
• [Frontend] Universal Web3 Transaction Simulator & Gas Estimator #491 Added Web3 transaction simulation utilities for Stellar and EVM transactions.
• [Frontend] Universal Web3 Transaction Simulator & Gas Estimator #491 Added /devtools/simulator UI and devtools navigation entry.
• [Frontend] Client-Side Encryption/Decryption Utility for P2P Messaging #485 [Frontend] Universal Web3 Transaction Simulator & Gas Estimator #491 Added Vitest setup and focused unit tests with coverage thresholds.

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