Nodes relayed via MQTT are already tracked in Node.viaMqtt and surfaced in the UI ("via MQTT" label), but there was no way to filter them out of the node list. This adds an "Exclude MQTT" toggle alongside the existing node filters.

Changes

Filter infrastructure

• UiPreferencesDataSource — exclude-mqtt DataStore key, excludeMqtt StateFlow, setExcludeMqtt()
• NodeFilterPreferences — exposes excludeMqtt flow, adds toggleExcludeMqtt()
• NodeFilterState — new excludeMqtt: Boolean = false field

ViewModel wiring

excludeMqtt is fed directly as a third input into the nodeFilter combine rather than going through NodeFilterToggles. This keeps filterToggles as the original clean 5-flow combine (the typed-lambda combine overload caps at 5 flows) and avoids chaining:

private val nodeFilter: Flow<NodeFilterState> =
    combine(
        _nodeFilterText,
        filterToggles,
        nodeFilterPreferences.excludeMqtt,
    ) { filterText, filterToggles, excludeMqtt ->
        NodeFilterState(..., excludeMqtt = excludeMqtt)
    }

Filter logic

GetFilteredNodesUseCase adds a post-processing step: .filter { if (filter.excludeMqtt) !node.viaMqtt else true }

UI

• NodeFilterTextField — new excludeMqtt/onToggleExcludeMqtt params; checkbox added to the filter dropdown
• Both NodeListScreen (Android) and DesktopAdaptiveNodeListScreen pass the new params through

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