feat(config): modernize init prompt styling

[laipz8200]

Summary

Modernizes the interactive config init setup flow with a cleaner TTY-only step renderer.

Changes

• Adds styled active and completed step indicators for the setup flow.
• Uses aligned, dimmed helper text for prompts, accessible space lists, and selection hints.
• Keeps plain non-TTY output unchanged for scripts and captured command output.

Impact

Users running confluence-cli config init in a terminal get a more polished setup experience, while automation keeps the existing stable prompt behavior.