[plan] Implement new idiomatic spinner using Bubble Tea

[github-actions]

Objective

Implement a new spinner using the idiomatic Bubble Tea pattern identified in the research phase.

Context

Based on the design document from the research task, implement a new spinner that follows Bubble Tea best practices while maintaining existing functionality.

Approach

1. Create new implementation in pkg/console/spinner_v2.go (keep old for now)
2. Use recommended Bubble Tea pattern (e.g., tea.WithoutRenderer() or direct component)
3. Maintain existing API: Start(), Stop(), SetMessage()
4. Preserve TTY detection and accessibility support
5. Eliminate manual goroutine management and mutexes

Files to Modify

• Create: pkg/console/spinner_v2.go (new implementation)
• Reference: pkg/console/spinner.go (for API compatibility)

Implementation Checklist

• Implement SpinnerV2 struct with same public API
• Use Bubble Tea program or direct component (no custom goroutines)
• TTY detection works (disable in pipes/CI)
• Accessibility support (ACCESSIBLE env var)
• MiniDot animation style maintained
• Clean start/stop semantics
• No mutex required

Acceptance Criteria

• New implementation compiles without errors
• API is compatible with existing SpinnerWrapper
• TTY and accessibility checks work
• Code is ~30% smaller than current implementation
• No manual goroutine or mutex management
  Related to [plan] Refactor spinner to use idiomatic Bubble Tea pattern #9189

AI generated by Plan Command for discussion #9188