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276cde44e7
On a mesh-only/offline device the app used to bootstrap Tor and spin
Nostr relay reconnects forever ("connecting to Tor…"), wasting battery
even when there was provably no network path at all.
Add an NWPathMonitor-backed reachability signal (NetworkReachabilityMonitor)
and fold it into NetworkActivationService's activation gate:
- Tor bootstrap and relay connect/reconnect are now gated on the network
path being usable. When the path is fully unsatisfied (no interface at
all) we set autoStart off, shut Tor down, and disconnect relays instead
of looping. When a usable path returns we resume.
- Conservative policy: only NWPath.Status.unsatisfied counts as offline.
A flaky-but-present link stays "reachable" (Tor tolerates intermittent
connectivity); we never tear down on the first hiccup.
- Transitions are debounced (ReachabilityDebounce, ~2.5s) so path flapping
cannot thrash Tor/relay startup. The debounce is a pure value type,
unit-tested without the Network framework or real timers.
- Starts optimistic (reachable) so nothing is suppressed before the first
path evaluation arrives.
- BLE mesh never consults this gate and works fully offline.
- NWPathMonitor's background callback hops to the main actor before
touching any state.
Surfaces NetworkActivationService.isNetworkReachable for UI to distinguish
"offline" from "connecting to Tor".
Tests: pure debounce (satisfied → allowed, unsatisfied → suppressed after
interval, flap debounced, recover-after-outage) plus service wiring
(unreachable suppresses Tor+relays, recovery resumes, loss disconnects).
Co-authored-by: jack <jackjackbits@users.noreply.github.com>
Co-authored-by: Claude Fable 5 <noreply@anthropic.com>