test(tui-03): verify Disconnected resets snapshot state and reaches ConnectionReducer

apps/tui/src/test/kotlin/com/correx/apps/tui/reducer/RootReducerTest.kt

@@ -2,6 +2,7 @@ package com.correx.apps.tui.reducer
 
 import com.correx.apps.server.protocol.ClientMessage
 import com.correx.apps.tui.input.Action
+import com.correx.apps.tui.state.ConnectionState
 import com.correx.apps.tui.state.InputMode
 import com.correx.apps.tui.state.TuiState
 import org.junit.jupiter.api.Assertions.assertEquals
@@ -101,6 +102,22 @@ class RootReducerTest {
         assertEquals(1L, result.cursors["s2"])
     }
 
+    @Test
+    fun `Disconnected resets snapshot state and sets connection to disconnected`() {
+        val state = TuiState(
+            snapshotPhase = false,
+            cursors = mapOf("s1" to 3L),
+            connection = ConnectionState(connected = true),
+        )
+
+        val (newState, _) = RootReducer.reduce(state, Action.Disconnected, fixedClock)
+
+        assertEquals(true, newState.snapshotPhase)
+        assertTrue(newState.cursors.isEmpty())
+        assertEquals(false, newState.connection.connected)
+        assertEquals(state.sessions.sessions, newState.sessions.sessions)
+    }
+
     @Test
     fun `AppendChar followed by Backspace returns to original buffer`() {
         val initial = TuiState(inputMode = InputMode.ROUTER, inputBuffer = "ab")

apps/tui/src/test/kotlin/com/correx/apps/tui/reducer/SnapshotPhaseReducerTest.kt

@@ -87,6 +87,22 @@ class SnapshotPhaseReducerTest {
         assertEquals(8L, result.state.cursors["s1"])
     }
 
+    @Test
+    fun `Disconnected resets snapshotPhase, pendingEvents, and cursors`() {
+        val state = TuiState(
+            snapshotPhase = false,
+            cursors = mapOf("s1" to 5L),
+            pendingEvents = listOf(ServerMessage.ProtocolError("x")),
+        )
+
+        val result = SnapshotPhaseReducer.process(state, Action.Disconnected)
+
+        assertEquals(true, result.state.snapshotPhase)
+        assertTrue(result.state.pendingEvents.isEmpty())
+        assertTrue(result.state.cursors.isEmpty())
+        assertEquals(listOf(Action.Disconnected), result.actionsToDispatch)
+    }
+
     @Test
     fun `during snapshotPhase SessionSnapshot installs cursor and is forwarded to sub-reducers`() {
         val state = TuiState(snapshotPhase = true)