feat(chat): stabilize multi-image attachment picker (#986)

app/src/test/java/com/m57/hermescontrol/ui/chat/ChatViewModelTest.kt

@@ -1305,6 +1305,24 @@ class ChatViewModelTest {
             assertEquals("dummy.txt", pending[0].name)
         }
 
+    @Test
+    fun addAttachments_keepsEverySelectedImageInOrder() =
+        runTest {
+            val viewModel = createViewModel()
+            advanceUntilIdle()
+            val selected =
+                listOf(
+                    Attachment("content://image/1", "one.jpg", "image/jpeg", 100L),
+                    Attachment("content://image/2", "two.png", "image/png", 200L),
+                    Attachment("content://image/3", "three.webp", "image/webp", 300L),
+                )
+
+            viewModel.addAttachments(selected)
+            advanceUntilIdle()
+
+            assertEquals(selected, viewModel.uiState.value.pendingAttachments)
+        }
+
     @Test
     fun testRemoveAttachment_validIndex() =
         runTest {