TUI update

[yashksaini-coder]

This pull request introduces significant enhancements to the TUI-based Python virtual environment manager, including new features for virtual environment deletion, improved UI, command-line argument support, and comprehensive test coverage. The most important changes are grouped below:

Feature Enhancements:

• Added functionality to delete virtual environments with confirmation dialogs, including methods start_deletion, confirm_deletion, and cancel_deletion in the App struct. These methods ensure safe deletion with proper index validation and UI updates. (src/app.rs, src/app.rsR2-R63)

User Interface Improvements:

• Updated the TUI to display a list of virtual environments, their sizes, and last modified timestamps, with navigation and deletion options. Added a confirmation dialog overlay for deletion actions. (src/ui.rs, src/ui.rsR2-R104)
• Introduced helper functions like centered_rect to manage UI layout for dialogs. (src/ui.rs, src/ui.rsR2-R104)

Command-Line Argument Support:

• Integrated clap for parsing command-line arguments, enabling users to specify a scan path and choose a non-TUI mode to list virtual environments. (src/main.rs, src/main.rsL6-R110)
• Added a --no-tui flag to print found virtual environments directly to the console. (src/main.rs, src/main.rsL6-R110)

Dependency Updates:

• Added clap (with derive feature), crossterm, and ratatui for command-line parsing and TUI rendering. (Cargo.toml, Cargo.tomlR12)

Test Coverage:

• Added extensive unit tests for the App struct, including navigation, deletion workflows, and edge cases. (src/app.rs, src/app.rsR80-R292)
• Introduced tests for directory size calculation and virtual environment scanning in the scanner module. (src/scanner.rs, src/scanner.rsR64-R182)
  This pull request introduces significant enhancements to the TUI-based Python virtual environment manager, including new features for virtual environment deletion, improved UI, command-line argument support, and comprehensive test coverage. The most important changes are grouped below:

Feature Enhancements:

• Added functionality to delete virtual environments with confirmation dialogs, including methods start_deletion, confirm_deletion, and cancel_deletion in the App struct. These methods ensure safe deletion with proper index validation and UI updates. (src/app.rs, src/app.rsR2-R63)

User Interface Improvements:

• Updated the TUI to display a list of virtual environments, their sizes, and last modified timestamps, with navigation and deletion options. Added a confirmation dialog overlay for deletion actions. (src/ui.rs, src/ui.rsR2-R104)
• Introduced helper functions like centered_rect to manage UI layout for dialogs. (src/ui.rs, src/ui.rsR2-R104)

Command-Line Argument Support:

• Integrated clap for parsing command-line arguments, enabling users to specify a scan path and choose a non-TUI mode to list virtual environments. (src/main.rs, src/main.rsL6-R110)
• Added a --no-tui flag to print found virtual environments directly to the console. (src/main.rs, src/main.rsL6-R110)

Dependency Updates:

• Added clap (with derive feature), crossterm, and ratatui for command-line parsing and TUI rendering. (Cargo.toml, Cargo.tomlR12)

Test Coverage:

• Added extensive unit tests for the App struct, including navigation, deletion workflows, and edge cases. (src/app.rs, src/app.rsR80-R292)
• Introduced tests for directory size calculation and virtual environment scanning in the scanner module. (src/scanner.rs, src/scanner.rsR64-R182)