v0.0.40: reliability — call reload, ETH cache prefill, 10 server tests

Call state reload on restart:
- Loads Ringing/Active calls from sled into active_calls on startup
- Expires calls older than 24h automatically

TUI sender ETH cache prefill:
- prefill_eth_cache() resolves all known contacts on poll_loop start
- First message from known contacts now shows ETH address immediately

Server integration tests (10 new):
- push_to_client offline/online
- register_ws + connection cap (5 max)
- is_online + device_count
- kick_device + revoke_all_except
- deliver_or_queue offline/online
- call state lifecycle
- list_devices

155 tests passing (was 135)

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

warzone/crates/warzone-server/src/state.rs

@@ -273,3 +273,142 @@ impl AppState {
         }
     }
 }
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    fn test_state() -> AppState {
+        let dir = tempfile::tempdir().unwrap();
+        AppState::new(dir.path().to_str().unwrap()).unwrap()
+    }
+
+    #[tokio::test]
+    async fn push_to_client_returns_false_when_offline() {
+        let state = test_state();
+        assert!(!state.push_to_client("abc123", b"hello").await);
+    }
+
+    #[tokio::test]
+    async fn register_ws_and_push() {
+        let state = test_state();
+        let (_, mut rx) = state.register_ws("test_fp", None).await.unwrap();
+
+        assert!(state.push_to_client("test_fp", b"hello").await);
+        let msg = rx.recv().await.unwrap();
+        assert_eq!(msg, b"hello");
+    }
+
+    #[tokio::test]
+    async fn ws_connection_cap() {
+        let state = test_state();
+        // Hold receivers so senders stay open (register_ws prunes closed senders).
+        let mut _holders = Vec::new();
+        for i in 0..5 {
+            let res = state.register_ws("same_fp", None).await;
+            assert!(res.is_some(), "connection {} should succeed", i);
+            _holders.push(res.unwrap());
+        }
+        // 6th should fail
+        assert!(state.register_ws("same_fp", None).await.is_none());
+    }
+
+    #[tokio::test]
+    async fn is_online_and_device_count() {
+        let state = test_state();
+        assert!(!state.is_online("fp1").await);
+        assert_eq!(state.device_count("fp1").await, 0);
+
+        // Must hold receivers so the senders are not marked as closed.
+        let _r1 = state.register_ws("fp1", None).await;
+        assert!(state.is_online("fp1").await);
+        assert_eq!(state.device_count("fp1").await, 1);
+
+        let _r2 = state.register_ws("fp1", None).await;
+        assert_eq!(state.device_count("fp1").await, 2);
+    }
+
+    #[tokio::test]
+    async fn kick_device() {
+        let state = test_state();
+        let (device_id, _) = state.register_ws("fp1", None).await.unwrap();
+
+        assert!(state.kick_device("fp1", &device_id).await);
+        assert!(!state.is_online("fp1").await);
+    }
+
+    #[tokio::test]
+    async fn revoke_all_except() {
+        let state = test_state();
+        let (id1, _rx1) = state.register_ws("fp1", None).await.unwrap();
+        let (_id2, _rx2) = state.register_ws("fp1", None).await.unwrap();
+        let (_id3, _rx3) = state.register_ws("fp1", None).await.unwrap();
+
+        let removed = state.revoke_all_except("fp1", &id1).await;
+        assert_eq!(removed, 2);
+        assert_eq!(state.device_count("fp1").await, 1);
+    }
+
+    #[tokio::test]
+    async fn deliver_or_queue_offline() {
+        let state = test_state();
+        // No WS connected -- should queue
+        let delivered = state.deliver_or_queue("offline_fp", b"test message").await;
+        assert!(!delivered);
+
+        // Check message was queued in DB
+        let prefix = "queue:offline_fp";
+        let count = state.db.messages.scan_prefix(prefix.as_bytes()).count();
+        assert_eq!(count, 1);
+    }
+
+    #[tokio::test]
+    async fn deliver_or_queue_online() {
+        let state = test_state();
+        let (_, mut rx) = state.register_ws("online_fp", None).await.unwrap();
+
+        let delivered = state.deliver_or_queue("online_fp", b"instant").await;
+        assert!(delivered);
+
+        let msg = rx.recv().await.unwrap();
+        assert_eq!(msg, b"instant");
+    }
+
+    #[tokio::test]
+    async fn call_state_lifecycle() {
+        let state = test_state();
+
+        let call = CallState {
+            call_id: "call-001".into(),
+            caller_fp: "alice".into(),
+            callee_fp: "bob".into(),
+            group_name: None,
+            room_id: None,
+            status: CallStatus::Ringing,
+            created_at: chrono::Utc::now().timestamp(),
+            answered_at: None,
+            ended_at: None,
+        };
+
+        state.active_calls.lock().await.insert("call-001".into(), call);
+        assert_eq!(state.active_calls.lock().await.len(), 1);
+
+        // End the call
+        if let Some(mut c) = state.active_calls.lock().await.remove("call-001") {
+            c.status = CallStatus::Ended;
+            c.ended_at = Some(chrono::Utc::now().timestamp());
+            let _ = state.db.calls.insert(b"call-001", serde_json::to_vec(&c).unwrap());
+        }
+        assert_eq!(state.active_calls.lock().await.len(), 0);
+    }
+
+    #[tokio::test]
+    async fn list_devices() {
+        let state = test_state();
+        let _r1 = state.register_ws("fp1", None).await;
+        let _r2 = state.register_ws("fp1", None).await;
+
+        let devices = state.list_devices("fp1").await;
+        assert_eq!(devices.len(), 2);
+    }
+}