v0.12.0

Changed

• Reworked the main studio into a premium workstation interface with compact top chrome, runtime status, editor toolbar, output deck tabs, persistent queue/library empty states, inspector-style engine controls, a clearer generation module, and a bottom system rail.
• Refined dark and light theme tokens, table surfaces, empty states, mobile toolbar collapse, toast placement, and responsive queue/library layout.

Fixed

• Added an explicit captions track fallback for generated audio elements so local lint is clean and result playback keeps an accessibility-compatible media structure.