fix(init): improve subdir prompt with TTY check and --subdir flag

[runkids]

Follow-up to #78.

• Add --subdir CLI flag for scriptable/CI usage
• Add TTY guard so the prompt is skipped in non-interactive environments
• Use consistent bufio.Reader for all input (no mixed fmt.Scanln)
• Use ui.Info / ui.Success aligned with other init steps

[gemini-code-assist]

Summary of Changes

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This pull request enhances the init command by introducing a --subdir CLI flag for non-interactive subdirectory specification, improving its usability in automated workflows. It also refines the interactive prompt for subdirectory selection by adding a TTY check, standardizing input methods, and aligning UI messages for a more consistent and robust user experience.

Highlights

• New CLI Flag: Introduced a --subdir CLI flag to allow specifying a subdirectory for skill storage in a scriptable or CI environment, bypassing interactive prompts.
• Non-Interactive Environment Support: Added a TTY guard to skip the subdirectory prompt in non-interactive environments, ensuring the init command behaves predictably in automated scripts.
• Input Consistency: Standardized input handling in useSourceSubdir to consistently use bufio.Reader, replacing mixed fmt.Scanln usage.
• UI/UX Improvement: Aligned UI messages in the subdirectory prompt with ui.Info and ui.Success for a consistent user experience across init steps.

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Changelog

• cmd/skillshare/init.go
  • Added a subdir field to the initOptions struct to store the specified subdirectory.
  • Implemented parsing logic for the new --subdir command-line flag, including validation for missing arguments.
  • Modified the performFreshInit function to prioritize the --subdir flag value over interactive prompting for subdirectory selection.
  • Updated the useSourceSubdir function to include a TTY check, ensuring the prompt is only displayed in interactive terminals.
  • Replaced fmt.Scanln with bufio.NewReader for consistent input handling in useSourceSubdir.
  • Integrated ui.Info and ui.Success for displaying messages within the useSourceSubdir function, aligning with the application's UI standards.

Activity

• The pull request was created by runkids.
• No further human activity has been recorded on this pull request yet.

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[gemini-code-assist]

Code Review

This pull request introduces a --subdir flag for non-interactive environments and improves the interactive prompt for specifying a subdirectory during initialization. The changes align with the pull request's goals by adding a TTY check to skip the prompt in CI and using a consistent method for reading user input. My review includes a few suggestions to improve error handling for user input and to clarify a success message.