ECP-0018: discovery mode toggles in Tauri UI

Status

Draft

Context

Discovery is now opt-in (DHT/mDNS with DNS disabled by default). Users need an in-app way to enable discovery without setting environment variables.

Decision

Add a discovery settings section to the Tauri viewer UI with toggles for DHT, mDNS, and DNS (pkarr relay). The selected modes are sent with MoQ connect, share, and catalog discovery commands.

Details

UI stores discovery state (DHT/mDNS/DNS) and emits a comma-separated string (e.g. dht,mdns).
Manual MoQ connect, catalog discovery, and Share use the selected discovery config.
If no modes are enabled, discovery remains off and share bundles must include full endpoint addresses.

Consequences

Users can opt in to decentralized discovery without env vars.
DNS discovery remains explicit and off by default.

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