Release: Version 2.0

[callinmullaney]

This PR does the following:

• Prepares Emulsify Tools for the 2.0 release.
• Updates compatibility to Drupal ^11.3, PHP ^8.4, and Drush 13+.
• Adds support for theme-defined Twig namespaces via components.namespaces in theme .info.yml files.
• Adds Twig switch, case, default, and endswitch tags.
• Refactors bem() and add_attributes() to use a shared TwigAttributeManager.
• Modernizes the Emulsify subtheme generation command while preserving the drush emulsify alias.
• Adds starter recipe archive extraction support for generated themes.
• Adds favicon migration and repair tooling for Emulsify 7.x, including:
  • a post-update to backfill installed theme favicon settings
  • Drush commands/services for repairing child theme favicon config
  • optional support for applying frontend favicon packages to admin pages
• Adds repository maintenance updates, including PR/issue templates, semantic release workflow updates, PHP compatibility linting, PHPStan config, PHPUnit config, and test fixtures.
• Adds unit coverage for Twig helpers, switch tags, namespace registration, favicon repair/backfill logic, admin favicon handling, archive extraction, and subtheme generation.

Related Issue(s)

• N/A

Notes:

• This is a breaking release.
• Drupal 10 support has been removed.
• Existing favicon config values are preserved during repair/backfill operations.
• Admin theme favicon support is opt-in for supported Emulsify-based themes.

Functional Testing:

• Install the module on a Drupal 11.3+ site using PHP 8.4+.
• Confirm the module installs cleanly and database updates run successfully.
• Run drush emulsify my_theme and confirm a child theme is generated.
• Add components.namespaces entries to an Emulsify-based theme and confirm templates resolve with syntax like @atoms/button/button.twig.
• Confirm bem() and add_attributes() still merge attributes and classes correctly.
• Confirm {% switch %}, {% case %}, {% default %}, and {% endswitch %} render expected Twig output.
• Run the favicon repair command and confirm missing child theme favicon config/schema keys are added without overwriting existing values.
• Enable the admin theme favicon option and confirm admin pages use the generated frontend favicon package.
• Run the unit test suite and PHP compatibility checks.

Security

• SVG favicon source backfilling uses sanitization before storing portable favicon source data.
• No other known security concerns.

Accessibility

• No direct accessibility changes are included.
• Favicon and metadata changes should be visually/semantically neutral.