Add ByteBeatSphere prototype component and ByteBeat notes; embed in Dashboard

[robstave]

Motivation

• Introduce a ByteBeat audio/visual prototype as a gameplay/audio texture experiment for the app.
• Surface the prototype on the main UI so designers can interact with and evaluate the effect directly from the dashboard.
• Capture the idea and sample formula in the project notes so the concept is discoverable for future iterations.

Description

• Added a new React component meowmorize-frontend/src/components/ByteBeatSphere.jsx that renders a cursor-driven demo with a sphere enemy, procedural ByteBeat audio, a waveform SVG, and an Enable ByteBeat Audio control.
• Integrated the prototype into the dashboard by importing and inserting ByteBeatSphere in meowmorize-frontend/src/pages/Dashboard.jsx above the decks table.
• Updated features.md to include a ByteBeat concept notes section with the candidate formula and references for further experimentation.

Testing

• No automated tests were run for this change.

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Codex Task