Refactor CLI report handling and add version/no-fail options

[lukegre]

Summary

This PR refactors the CLI report handling to separate report generation from rendering, adds --version and --no-fail command-line options, improves HTML report styling with dark mode support and copy-to-clipboard functionality, and enhances the argument normalization logic.

Key Changes

• Report Generation Refactoring: Modified all check functions to return reports in "python" format internally, then render them separately via a new _render_check_report() function. This decouples report generation from output formatting.

• New CLI Options:

  • Added --version flag to display the package version
  • Added --no-fail flag to exit with code 0 even when checks fail (useful for CI reporting-only pipelines)

• Improved Argument Normalization: Enhanced _normalize_check_argv() to correctly handle leading option flags (e.g., nc-check --no-fail input.nc now properly normalizes to nc-check --no-fail compliance input.nc)

• HTML Report Enhancements:

  • Added dark mode CSS with color scheme preferences
  • Made report action buttons sticky at the top with backdrop blur effect
  • Added copy-to-clipboard buttons for <pre> code blocks with visual feedback
  • Added version and generation date stamps to all HTML report subtitles

• Report Failure Detection: Added _report_failed() function to determine if a report indicates check failures, enabling proper exit code handling with the --no-fail option

• Version Management: Exported __version__ from the main package module for use in CLI and report generation

Implementation Details

• Report rendering now happens after all checks complete, allowing consistent handling across all check modes (compliance, ocean-cover, time-cover, all)
• The _run_all_checks() function signature was simplified by removing report_format and report_html_file parameters
• HTML reports now include metadata (version, generation date) for better traceability
• Dark mode styling uses CSS custom properties and prefers-color-scheme media query for automatic theme detection

https://claude.ai/code/session_01Ss5iprT8oNfgrdaVEznYLk