Package crossword game widget for pub.dev

[sami-bre]

Extracts the crossword game widget into a new Flutter package and updates the main app to use it, including a guide for publishing the package to pub.dev.

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Extracts the crossword widget into a reusable package and updates the app to depend on and use it, adding docs and package metadata.

• New package: packages/crossword_game_widget
  • Exposes Crossword widget and CrosswordSelectionCallback via lib/crossword_game_widget.dart.
  • Implements core widget in src/crossword.dart and painter in src/crossword_painter.dart with improved repaint logic and pointer safety.
  • Adds package metadata and docs: pubspec.yaml, CHANGELOG.md, README.md, analysis_options.yaml, and PUBLISHING_STEPS.md.
• App integration
  • Replaces local implementation by removing lib/crossword.dart and lib/crossword_painter.dart.
  • Updates lib/main.dart to import crossword_game_widget and use the new onLineDrawn callback signature.
  • Updates root pubspec.yaml/pubspec.lock to depend on the new path package.

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[cursor]

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[sami-bre]

this file should be out of the package folder coz it won't be published due to security risks