feat(frontend): fix #483 playwright e2e suite and #480 xstate web3 lifecycle

[Dopezapha]

Closes #480
Closes #483

PR Description

Fixes #483 by adding a frontend Playwright E2E suite with CI coverage, mocked Stellar/Ethereum wallet providers, mocked WebSocket transport, and critical journey tests for wallet provider setup, restored wallet state, simulator loading, and Soroban playground loading.

Fixes #480 by introducing an XState-powered Web3 transaction lifecycle for wallet connection, network switching, signing, submission, confirmation, failure, and disconnection. The wallet context now publishes lifecycle state while preserving the existing public wallet API, and the wallet devtools page includes a visual state chart for debugging.

Changed

• [Frontend] Comprehensive End-to-End Testing Suite using Playwright #483 Added Playwright config, E2E scripts, CI workflow, wallet provider mocks, WebSocket mocks, and frontend journey specs.
• [Frontend] Advanced State Management Refactor using XState #480 Added the Web3 transaction lifecycle machine and integrated it into WalletContext.
• [Frontend] Advanced State Management Refactor using XState #480 Added a transaction state chart to the wallet devtools page.
• [Frontend] Comprehensive End-to-End Testing Suite using Playwright #483 Hardened Freighter unavailable handling so tests and users get a controlled failure state.

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[ayomideadeniran]

Pr under review