test: initialize Playwright configuration and add stellar-receive test spec

[AdeMi20]

Summary of What Was Done

I optimized the StellarReceive component by implementing @tanstack/react-virtual to virtualize the match list, significantly reducing DOM overhead, and paired it with a "Show 25 more" pagination flow. To handle balances efficiently, I integrated @tanstack/react-query to lazily fetch balances (with built-in retry primitives) only for rows that are actively rendered in the viewport. I then added an in-memory search input that seamlessly filters these virtualized rows by their stealth address or fetched balance amount. Finally, I authored a Playwright test that intelligently mocks the Freighter wallet and intercepts the Stellar RPC network responses to simulate a fixture environment with 35 stealth matches, fully validating the virtualization, pagination, and lazy-loading requirements.

Close #61

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[truthixify]

The virtualization work matches your assignment for #61. Three things to fix before merge:

1. Drop playwright-report/ and test-results/ directories from the PR. These are auto-generated by Playwright runs and shouldn't be committed.

   rm -rf playwright-report test-results
   echo -e "playwright-report/\ntest-results/" >> .gitignore

2. Update the PR title to reflect the actual work: something like "feat(demo/stellar): virtualize StellarReceive matches list (Pagination & virtualization for receive announcement list #61)".

3. Conflicts in StellarReceive.tsx, package.json, playwright.config.ts, pnpm-lock.yaml. Rebase:

   git fetch origin
   git rebase origin/develop
   git add -u
   git commit --amend
   git push --force-with-lease

When resolving StellarReceive.tsx, keep develop's content (Worker integration, sponsored withdrawal, labeling) and layer virtualization on top.