[plan] Add spinner integration for workflow compilation progress

[github-actions]

Objective

Integrate huh/spinner to show progress feedback during workflow compilation in the interactive builder.

Context

After users complete the interactive form, the workflow compilation happens silently. This can be confusing, especially if compilation takes time. The huh library provides a built-in spinner component perfect for this use case.

Approach

Use huh/spinner to show compilation progress:

import "github.com/charmbracelet/huh/spinner"

func (b *InteractiveWorkflowBuilder) compileWorkflow(verbose bool) error {
    var compileErr error
    
    err := spinner.New().
        Title("Compiling your workflow...").
        Action(func() {
            config := CompileConfig{
                WorkflowFiles: []string{b.workflowPath},
                Verbose:       verbose,
            }
            _, compileErr = CompileWorkflows(config)
        }).
        Run()
    
    if err != nil {
        return err
    }
    return compileErr
}

Consider adding:

• Success message after compilation completes
• Error handling with clear messages
• Optional accessible mode support

Files to Modify

• Update: pkg/cli/interactive.go - Add spinner to compilation step
• Update: go.mod - Ensure huh/spinner is imported (likely already available)

Acceptance Criteria

• Spinner displays during workflow compilation
• Clear "Compiling your workflow..." message shown
• Spinner stops when compilation completes
• Success message shown after successful compilation
• Errors are displayed clearly if compilation fails
• Works in both accessible and standard modes
  Related to [plan] Enhance interactive workflow builder with huh v0.7.0+ features #7216

AI generated by Plan Command for discussion #7214