[karagozemin]

Closes #513

Summary

• validate a settled transaction hash and load path-payment operations from Horizon
• distinguish strict-send minimum-destination and strict-receive maximum-send bounds
• calculate exact slippage with integer-safe seven-decimal arithmetic
• render intermediate path assets and distinct not-found/no-path/malformed/rate-limit outcomes
• add the complete 35-file feature slice and focused coverage

Verification

• npm run verify:features -- path-payment-slippage-calculator
• npx eslint features/path-payment-slippage-calculator (0 errors)
• npx vitest run features/path-payment-slippage-calculator (18 tests passed)
• npx tsc --noEmit

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