refactor: streamline Stellar announcement fetching and add sdk-react …

[emarkees]

Closes #53

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🚀 Description
This PR introduces the new @wraith-protocol/sdk-react companion hooks package, providing standardized React 18+ integrations to prevent integrators from writing repetitive useState/useEffect glue. It also includes fixes for underlying SDK bugs discovered during integration, and ships with a working example application.

📦 Features & Scope

New Workspace Package:

• Scaffolded packages/sdk-react and added it to pnpm-workspace.yaml.

Core Hooks Implemented:

• useStellarStealthKeys
• useStellarAnnouncementScan
• useStellarSendStealthPayment
• useStellarName
• useStellarBalance
• React 18 Strict Mode: Added safe cleanup handling in useEffects to prevent race conditions and memory leaks during double-mounting.
  Testing & Build Pipeline: Fully configured vitest with jsdom testing environments.

[emarkees]

Close #53

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You can now already apply to more issues while waiting for a review of this PR. Keep up the great work! 🚀

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[truthixify]

The actual issue #53 work would be Stellar announcement streamlining + sdk-react. But this PR contains the exact same agent-generated cruft files we've been clearing out of #95 and #97:

• BENCHMARK_IMPLEMENTATION.md
• CONTEXT_BENCHMARKS_COMPLETE.md
• bench/README.md, bench/baseline.md
• docs/fee-estimation.md
• examples/react-native-stellar/*
• .github/workflows/benchmark.yml

git rm BENCHMARK_IMPLEMENTATION.md CONTEXT_BENCHMARKS_COMPLETE.md
git rm -r bench/ examples/react-native-stellar/
git rm docs/fee-estimation.md
git rm .github/workflows/benchmark.yml
git commit --amend --no-edit
git push --force-with-lease

Once those are gone, the actual streamlining + sdk-react work can land.

[truthixify]

Hey @emarkees — quick correction on my prior feedback. Since #97 landed, develop now has the examples/react-native-stellar/ directory intentionally (it's a working example). My earlier "delete those" advice was wrong in retrospect.

Updated cleanup:

git fetch origin
git rebase origin/develop
# in examples/react-native-stellar/*: take develop's version (don't delete)
# Still drop these (they ARE leftover agent cruft):
git rm BENCHMARK_IMPLEMENTATION.md CONTEXT_BENCHMARKS_COMPLETE.md
git rm -r bench/
git rm docs/fee-estimation.md
git rm .github/workflows/benchmark.yml
git rm src/chains/stellar/fee-estimation.ts test/chains/stellar/fee-estimation.test.ts test/chains/stellar/bench/stellar.bench.ts
# For src/chains/stellar/announcements.ts and src/chains/stellar/index.ts:
#   keep develop's version (it has the audit fixes from #93) and re-apply your refactor on top
git rebase --continue
git push --force-with-lease

Sorry for the back-and-forth.

[emarkees]

@truthixify kindly check for a review, Correction has been made on request

[emarkees]

@truthixify you can now merge as conflicts has been resolved

[truthixify]

Cruft cleaned, rebased. The actual work — sdk-react package + hooks + react-stellar-app example — looks good. Thanks for sticking with the cleanup, @emarkees.