Add node status, peers, and filter sync progress to the CBF node screen

[skypank-coder]

Closes #50.

The CBF node screen only exposed a binary Online/Offline status and the latest known block. This surfaces the live node data the Kyoto client already tracks.

What's shown now

• Node status distinguishes Connecting, Syncing, and Online, instead of just Online/Offline.
• Chain tip — the wallet's best block height.
• Connected peers — a live count plus each peer's address, from the client's peer_info().
• Filter sync progress — a percentage and progress bar, from the node's Progress events.

All of the node fields reset when the node stops.

Implementation notes

• WalletScreenState gains connectedPeers and filtersProgress; Kyoto gets a peerInfo() passthrough.
• The ViewModel now owns a single consumer of the info and warning streams, replacing Kyoto.logToLogcat(). It both logs to Logcat and updates the UI state. This has to stay a single consumer: infoLog()/warningLog() each drive their own next_info()/next_warning() loop, so a second collector running alongside logToLogcat() would have split the event stream between them.
• The peer list is re-read on connection events (ConnectionsMet/SuccessfulHandshake) and on warnings, since those are the events that actually change it — not on every progress tick.

[skypank-coder]

@thunderbiscuit Please review this .