Implement ErrorCard for terminal

[icedoutskay]

ErrorCard Renderer for Transaction Errors

Summary

Implements ErrorCard renderer that displays transaction errors prominently with a bold red border and categorical labels, making errors impossible to miss.

Changes

• renderers.rs: Added ErrorCard struct and render_error_card() function
  • Bold red block character border
  • Error category badge in uppercase
  • Error name with code
  • Contract component information (when applicable)
  • Human-readable summary
• human.rs: Integrated ErrorCard at the top of diagnostic reports
• BudgetBar: Fixed missing render() method with percentage calculations and color coding

Testing

• 8 comprehensive unit tests covering basic rendering, component display, styling, and edge cases
• All tests pass successfully

Files Modified

• crates/cli/src/output/renderers.rs - New ErrorCard implementation
• crates/cli/src/output/human.rs - Integration into report output

Example Output

████████████████████████████████████
█ [CONTRACT]
█ ❌ InsufficientBalance (1)
█ Component: CBDLTOJWR2YX2U6BR3P5C4UXKWHE5DJW3JPSIOEXTW2E7D5JUDPQULE7
█ The account does not have enough balance to complete transaction.
████████████████████████████████████

This PR closes #14

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[Emrys02]

@icedoutskay PR reviewed and confirmed, thanks

[Emrys02]

@icedoutskay fix conflict in your branch