[d-plug]

This PR implements four related UI enhancements to improve user experience:

Features Implemented

#136 - Visible page title for deep-linked views

• Added an h1 page title when viewing module details
• Provides better context for screen readers and when directly linking to module pages
• Uses sr-only class for visual consistency while maintaining accessibility

#137 - Not-found page for invalid module routes

• Displays a user-friendly error page when an invalid module is accessed
• Includes clear messaging and a button to return to the module list
• Handles edge cases gracefully

#146 - Download action for generated shell script

• Added a download button next to the copy button in the command builder
• Downloads commands as properly formatted shell scripts with headers
• Files are named based on the selected command type (e.g., soroban-testkit-coverage.sh)
• Includes timestamp and generator comment in the downloaded script

#147 - Session-only command history

• Tracks all generated commands during the current session
• Displays history with timestamps in a collapsible panel
• Allows copying individual commands from history
• Includes a clear history button
• History is stored in component state (not persisted across page reloads)

Implementation Details

• All features follow existing accessibility patterns with ARIA labels
• Keyboard navigation is fully supported
• Visual styling is consistent with the existing design system
• Tests added for all new functionality
• No breaking changes to existing features

Testing

• Added comprehensive unit tests for all four features
• Tests cover user interactions, accessibility, and edge cases
• Build passes successfully

Closes #136, Closes #137, Closes #146, Closes #147

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