Redesign snap page

[alexdlukens]

Snap page now scrolls as one cohesive element

Cue the Copilot summary:

This pull request introduces updates to the store-tui project, including dependency changes, code refactoring for improved type safety and functionality, and styling adjustments for the user interface. Below is a breakdown of the most important changes grouped by theme.

Dependency Updates:

• Updated snap-python dependency from 0.0.5 to >0.1 for compatibility improvements. Added snakeviz to development dependencies in pyproject.toml.
• Updated project version to 0.1.6 in pyproject.toml and snapcraft.yaml. [1] [2]

Code Refactoring:

• Changed categories type in CategoryModal from list[tuple[str, str]] to list[str] for simplicity.
• Refactored SnapModal class to replace TextArea with Markdown for better text rendering and adjusted get_icon_url method to handle None values for media. Removed unused install_button attribute. [1] [2] [3]
• Improved type handling in SnapResultTable and SnapStoreTUI classes by adding support for Optional types and default values for empty responses. [1] [2] [3]

UI Styling Adjustments:

• Updated snap_modal.tcss to remove padding and borders for cleaner visuals, adjusted row heights, and added a bottom border to the summary row. Introduced new styles for Vertical and #description-text elements. [1] [2] [3]

Snapcraft Metadata:

• Added source-code field to snapcraft.yaml for better project documentation.

These changes collectively enhance the project's maintainability, user interface, and compatibility with dependencies.