feat: implement contract error parsing and UI display (#082)

[Anuoluwapo25]

##Description

• Add parseContractError() utility that decodes Soroban invocation failures from XDR/error strings into structured ContractErrorResult with 20+ mapped codes, numeric ContractError(N) extraction, and heuristic token matching; unknown codes fall back to raw XDR display
• Add CollapsibleContractErrorPanel component with error code badge, human-readable description, suggested action callout, and copy button for unknown XDR fallback
• Add VestingEscrow page (/vesting) demonstrating contract error integration
• Integrate ContractErrorPanel into PayrollScheduler and CrossAssetPayment, replacing generic toast-only errors with structured in-page diagnostics
• Add 35 vitest integration tests covering all mapped codes, numeric codes, heuristic matching, unknown fallback, and resultXdr preservation

closes #155

[Wilfred007]

@Anuoluwapo25 Hi kindly run build to clear this error

Run npm run lint

scaffold-stellar-frontend@0.0.1 lint
eslint .

/home/runner/work/PayD/PayD/frontend/src/pages/CrossAssetPayment.tsx
29:10 error 'contractErrorXdr' is assigned a value but never used @typescript-eslint/no-unused-vars

/home/runner/work/PayD/PayD/frontend/src/pages/RevenueSplitDashboard.tsx
239:49 warning Do not use item index in the array as its key react-x/no-array-index-key
269:44 warning Do not use item index in the array as its key react-x/no-array-index-key

/home/runner/work/PayD/PayD/frontend/src/pages/TransactionHistory.tsx
32:19 warning Do not use item index in the array as its key react-x/no-array-index-key

/home/runner/work/PayD/PayD/frontend/src/services/revenueSplit.ts
1:1 warning Unused eslint-disable directive (no problems were reported from '@typescript-eslint/no-unsafe-call')
1:1 warning Unused eslint-disable directive (no problems were reported from '@typescript-eslint/no-unsafe-member-access')
1:1 warning Unused eslint-disable directive (no problems were reported from '@typescript-eslint/no-unsafe-argument')

✖ 7 problems (1 error, 6 warnings)
0 errors and 3 warnings potentially fixable with the --fix option.

Error: Process completed with exit code 1.

[Anuoluwapo25]

Okay

…

On Thu, Feb 26, 2026 at 1:01 PM Wilfred ***@***.***> wrote: *Wilfred007* left a comment (Gildado/PayD#179) <#179 (comment)> @Anuoluwapo25 <https://github.com/Anuoluwapo25> Hi kindly run build to clear this error Run npm run lint ***@***.*** lint eslint . /home/runner/work/PayD/PayD/frontend/src/pages/CrossAssetPayment.tsx 29:10 error 'contractErrorXdr' is assigned a value but never used @typescript-eslint/no-unused-vars /home/runner/work/PayD/PayD/frontend/src/pages/RevenueSplitDashboard.tsx 239:49 warning Do not use item index in the array as its key react-x/no-array-index-key 269:44 warning Do not use item index in the array as its key react-x/no-array-index-key /home/runner/work/PayD/PayD/frontend/src/pages/TransactionHistory.tsx 32:19 warning Do not use item index in the array as its key react-x/no-array-index-key /home/runner/work/PayD/PayD/frontend/src/services/revenueSplit.ts 1:1 warning Unused eslint-disable directive (no problems were reported from ***@***.***/no-unsafe-call') 1:1 warning Unused eslint-disable directive (no problems were reported from ***@***.***/no-unsafe-member-access') 1:1 warning Unused eslint-disable directive (no problems were reported from ***@***.***/no-unsafe-argument') ✖ 7 problems (1 error, 6 warnings) 0 errors and 3 warnings potentially fixable with the --fix option. Error: Process completed with exit code 1. — Reply to this email directly, view it on GitHub <#179 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/A55OV7SINJV4VCV73ZWGKN34N3ODBAVCNFSM6AAAAACWAKGU3OVHI2DSMVQWIX3LMV43OSLTON2WKQ3PNVWWK3TUHMZTSNRWGE4DAMRYGI> . You are receiving this because you were mentioned.Message ID: ***@***.***>