arb_excel_converter_tool

• Fixed: subcommand help flag support for export and import.
• Improved: Error handling for invalid command-line arguments.

🚀 Added

• Two-Way Sync: Introduced the import command. You can now convert Excel (.xlsx) files back into Flutter .arb files, completing the localization workflow.
• Smart Defaults: Both commands now look for standard Flutter paths by default (lib/l10n/app_en.arb), allowing for zero-config usage.
• New Primary CLI: Added arb_tool as the main global command with a revamped help menu and usage examples.
• Pretty-Print JSON: Imported ARB files are automatically formatted with a 2-space indent to match Flutter's localization standards.

🛠 Fixed & Improved

• Enhanced Help Menu: Added a rich in-terminal help experience with emojis, box-drawing characters, and contextual examples for sub-commands.
• Excel 4.x Migration: Rewrote row handling using TextCellValue to ensure compatibility with the latest excel package standards.
• Metadata Persistence: Improved the logic for handling @description tags during both export and import cycles.
• Robust Parsing: Added defensive checks to skip empty rows and handle missing keys gracefully during the import process.

• Fix: Resolved "Unsupported operation: Cannot remove from an unmodifiable list" crash during Excel sheet creation.
• Stability: Improved Excel saving logic for better compatibility across different OS environments.

• Feature: Added a default input path (lib/l10n/app_en.arb) for easier use.
• Feature: Added a --help (-h) flag for in-terminal instructions.
• Fix: Removed the "mandatory input" requirement that caused crashes.
• Improvement: Added descriptive error messages for missing files.
• Docs: Updated README with usage examples and an arguments table.

Added

• Initial public release of the ARB to Excel Converter Tool.
• Added core functionality to read .arb files and extract keys, values, and descriptions.
• Implemented command-line arguments for specifying input (-i) and output (-o) files.
• Created arb_export executable to simplify running the tool globally.