feat: command builder accessibility, keyboard navigation, reset, and validation states

[bade2brazy]

Summary

Closes #203
Closes #204
Closes #205
Closes #206
Closes #207

This pull request enhances the Soroban Testkit command builder with WAI-ARIA accessibility compliance, keyboard workflow navigation, default reset capabilities, clipboard feedback, and input validation with error recovery.

Key Changes

• Accessibility Assertions (Feature: Add accessibility assertions for the command builder #203):
  • Added WAI-ARIA tab pattern (role="tablist", aria-label="CLI commands", role="tab", aria-selected, aria-controls, id).
  • Added tabpanel relationship (role="tabpanel", id, aria-labelledby).
  • Explicitly associated labels and form inputs using htmlFor and id.
  • Added screen-reader announcement live region with role="status" and aria-live="polite".
• Keyboard Workflow Navigation (Feature: Add keyboard interaction tests for workflow navigation #204):
  • Implemented roving tabIndex (0 for active tab, -1 for inactive tabs).
  • Added arrow navigation (ArrowRight / ArrowLeft, ArrowDown / ArrowUp) across workflow tabs with automatic cycling.
  • Added jump navigation with Home (first tab) and End (last tab).
• Reset Behavior (Feature: Add tests for reset behavior after customized inputs #205):
  • Added Reset action to restore customized options back to canonical workflow defaults (DEFAULT_OPTIONS).
  • Updates generated command string and announces reset to assistive technology.
  • Clears active validation errors upon reset.
• Clipboard Success & Failure States (Feature: Add tests for clipboard success and failure states #206):
  • Visual and accessible status for copy success (Copied label, polite live region announcement).
  • Visual and accessible status for copy failure (Failed label, error styling, failure announcement).
  • Graceful error recovery: status and error styling revert back to Copy after timeout to allow retrying.
• Invalid Builder Input States (Feature: Add tests for invalid builder input states #207):
  • Added validation for required paths (cannot be empty or whitespace) and limits identifiers (fn and ramp validated as valid Rust identifiers).
  • Displays inline role="alert" messages linked to inputs via aria-invalid and aria-describedby.
  • Safely disables clipboard copy while inputs are invalid.
• Testing & Documentation:
  • Expanded unit tests in src/testkit.test.ts for input validation rules.
  • Added comprehensive test suites in src/App.test.tsx covering accessibility assertions, keyboard navigation, reset behavior, clipboard success/error handling, and invalid input states.
  • Updated README.md documenting new CLI workbench capabilities.

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