v0.2.2

Added

• Documented and tested mixed Vue, Svelte, React, and Solid islands on the same page, including repeated same-framework islands and mixed client directives.
• Added Solid island build support using .solid.jsx and .solid.tsx component filenames.

Changed

• Production island assets now build as ES modules and share common framework/runtime chunks through Volt 0.15.5.
• Moved island browser tests under test/astral/islands/browser/ and added Elixir build/integration coverage for mixed framework islands.
• Updated Volt to 0.15.5.