fix: stabilize native chat selection chrome

android/app/src/test/java/com/hyzq/boss/ProjectChatUiStateTest.java

@@ -7,6 +7,7 @@ import static org.junit.Assert.assertTrue;
 import static org.junit.Assert.fail;
 
 import java.util.ArrayList;
+import java.util.List;
 
 import org.junit.Test;
 
@@ -82,4 +83,63 @@ public class ProjectChatUiStateTest {
     public void bundleForwardMessageUsesBundleModeLabel() {
         assertEquals("聊天记录", ProjectChatUiState.labelForForwardKind("forward_bundle"));
     }
+
+    @Test
+    public void chromeStateUsesMultiSelectHeaderAndActionsWhenSelecting() {
+        ProjectChatUiState.SelectionState state = ProjectChatUiState.toggleSelection(null, "m1");
+        state = ProjectChatUiState.toggleSelection(state, "m2");
+
+        ProjectChatUiState.ChromeState chromeState =
+                ProjectChatUiState.resolveChromeState(state, true, "北区试产线回归", "归档确认");
+
+        assertTrue(chromeState.multiSelecting);
+        assertFalse(chromeState.showComposer);
+        assertTrue(chromeState.showMultiSelectBar);
+        assertFalse(chromeState.showRefresh);
+        assertFalse(chromeState.showHeaderAction);
+        assertTrue(chromeState.forwardEnabled);
+        assertEquals("取消", chromeState.backLabel);
+        assertEquals("已选 2 条", chromeState.title);
+        assertEquals("选择要转发的消息", chromeState.subtitle);
+    }
+
+    @Test
+    public void chromeStateUsesConversationHeaderWhenNotSelecting() {
+        ProjectChatUiState.ChromeState chromeState =
+                ProjectChatUiState.resolveChromeState(ProjectChatUiState.emptySelection(), true, "北区试产线回归", "归档确认");
+
+        assertFalse(chromeState.multiSelecting);
+        assertTrue(chromeState.showComposer);
+        assertFalse(chromeState.showMultiSelectBar);
+        assertTrue(chromeState.showRefresh);
+        assertTrue(chromeState.showHeaderAction);
+        assertFalse(chromeState.forwardEnabled);
+        assertEquals("返回", chromeState.backLabel);
+        assertEquals("北区试产线回归", chromeState.title);
+        assertEquals("归档确认", chromeState.subtitle);
+    }
+
+    @Test
+    public void reconcileSelectionDropsMessagesMissingFromRenderSet() {
+        ProjectChatUiState.SelectionState state = ProjectChatUiState.toggleSelection(null, "m1");
+        state = ProjectChatUiState.toggleSelection(state, "m2");
+
+        ProjectChatUiState.SelectionState reconciled =
+                ProjectChatUiState.reconcileSelection(state, List.of("m2", "m3"));
+
+        assertTrue(reconciled.multiSelecting);
+        assertEquals(List.of("m2"), new ArrayList<>(reconciled.selectedMessageIds));
+    }
+
+    @Test
+    public void summarizeForwardBundleTruncatesLongLastMessage() {
+        String summary = ProjectChatUiState.summarizeForwardBundle(
+                "这是一条很长很长很长的转发消息摘要，用来验证截断逻辑是否生效并避免卡片过高",
+                3
+        );
+
+        assertTrue(summary.startsWith("3 条消息 · 最后一条："));
+        assertTrue(summary.endsWith("…"));
+        assertTrue(summary.contains("这是一条很长很长很长的转发消息摘要"));
+    }
 }