test(e2e): add Playwright smoke test for connect wallet, navigation, and send payment flow (#570)

[midexol]

Description

Resolves #570

This PR adds an end-to-end (E2E) smoke test suite using Playwright to test the complete user journey:

1. Initial application load rendering the \ConnectScreen.
2. Wallet connection transitioning the view from \ConnectScreen\ to the \Dashboard.
3. Navigation via the sidebar to the \TransactionsScreen.
4. Filling out the Send Payment form (destination address, amount) and submitting, asserting that the success banner and transaction hash are rendered.

Changes Made

• Installed @playwright/test\ in \devDependencies.
• Added \playwright.config.ts\ with Vite dev server integration (
  pm run dev\ on port 5173).
• Added \ est:e2e\ script to \package.json.
• Created \e2e/wallet-flow.spec.ts\ containing the full E2E smoke test suite.

Testing & Verification

• Ran
  pm run test:e2e\ (Playwright tests against running Vite dev server) - PASS.
• Ran
  px vitest run\ (Unit test suite) - PASS.
• Ran
  pm run type-check\ (TypeScript compilation check) - PASS.
• Ran
  pm run lint\ (ESLint check) - PASS.

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