Add VoxGrain main App component (src/App.tsx)

[jpbpari-sys]

Motivation

• Provide the main React application for the VoxGrain UI, wiring frontend controls to the audio/service layer and exposing core features (Jam Engine, Granular/3D synthesis, Harmonizer, Looper, Chain Lab, Neural Engine).
• Centralize state, presets, and module integration so the UI can control and monitor the AudioEngine and subsystem services in real time.
• Offer developer conveniences such as persona synthesis (Gemini), manifest export for Xcode/AUv3, and an in-app help/operational manual overlay.

Description

• Added a new file src/App.tsx that implements the top-level App React component and small internal UI components (LEDBar, WaveformSymbol, HelpOverlay).
• Integrated service imports and wiring for AudioEngine, BasinService, FMJService, CRISPRService, DirectorService, and NeuralSuitService, and exposed control functions including startEngine, updateSetting, and handlePersonaGen.
• Implemented state management and periodic updates with React hooks (useState, useEffect, useRef) to update levels, agent activity, basin/sub-module states, and integrity effects; added looper functions (toggleRecording, removeLoop, toggleMute), Chain Lab playback (captureNode, triggerChain, playStep) and preset management (savePreset, deleteUserPreset).
• Built a detailed UI layout containing controls, knobs, visualizer, Jam Engine, Harmonizer Matrix, Granular Engine, Looper, BasinModule integration, 3D Synthesis, Chain Lab, Neural Engine prompt/synthesis, and a manifest export helper (handleExportManifest).

Testing

• No automated tests were run on this change.

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Codex Task

[chatgpt-codex-connector]

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[chatgpt-codex-connector]

Retry mic startup instead of caching failed engine instance

When startMic() rejects (for example, permission denied or no input device), engineRef.current has already been set, so later clicks skip initialization and never call startMic() again. In that failure path the UI can still be marked active without a working microphone pipeline, and the user cannot recover without a full reload.

Useful? React with 👍 / 👎.

[chatgpt-codex-connector]

Guard preset hydration against invalid localStorage JSON

The initial userPresets state parses raw localStorage data without error handling, so any malformed or legacy value in voxgrain_user_presets throws during render and prevents the app from mounting. This should fall back to an empty preset list instead of crashing startup.

Useful? React with 👍 / 👎.