feat(ui): add select all button to configuration sections

[kaic]

Description

Adds a "Select All" / "Deselect All" button to each configuration category section, bringing parity with the software selector interface. This allows users to quickly enable or disable all tweaks within a specific category.

Type of Change

• feat: New feature (software, configuration, or functionality)

Changes Made

• Updated SelectionContext to include selectAllConfigsInCategory, deselectAllConfigsInCategory, and isAllConfigCategorySelected helpers.
• Updated ConfigSection component to include the "Select All" button in the section header.

Checklist

• I have tested my changes locally
• My code follows the project's code style
• I have used conventional commit format for my commit messages
• My changes do not break the build (npm run build)
• My changes pass linting (npm run lint)

Labels

ui, config