feat: implement initial structure for intelligent contract assistant …

[whitezaddy]

…(#566)
closes #566

Pull Request: Intelligent Contract Assistant for Dashboard

Summary

Implemented the intelligent contract interaction assistant in src/components/dashboard/ContractInteraction.tsx with history-aware guidance and preference-driven enable/disable behavior.

What Changed

• Added history loading from src/lib/storage.js and used it to derive assistant hints for matching contract calls.
• Implemented lastSuccessfulCallHint logic to show the user the most recent successful matching interaction.
• Added a “Disable Assistant” button in the assistant panel that updates user preferences via usePreferences.
• Ensured assistant behavior respects preferences.advanced.enableContractAssistant.
• Kept existing preferences UI integration intact.

Files Updated

• src/components/dashboard/ContractInteraction.tsx
• src/components/dashboard/tests/ContractInteraction.test.tsx

Tests

• Added focused component test covering:
  • rendering of assistant panel
  • history-backed guidance display
  • disable-assistant preference update
• Verified with:
  • pnpm exec vitest run --config vitest.config.js --run src/components/dashboard/tests/ContractInteraction.test.tsx

Notes

• Fixed Vitest mock initialization by using vi.doMock and dynamic import within the test setup to avoid hoisting issues.
• No broader app behavior changes introduced beyond the contract assistant flow.

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