feat(satellites): 勾选置顶显示——已选/可用分组＋顶部计数条（对齐上游）

core/data/src/main/java/com/rtbishop/look4sat/core/data/repository/SelectionRepo.kt

@@ -66,8 +66,17 @@ class SelectionRepo(
         }
     }
 
+    // Selected satellites are pinned to the top (matches upstream); ordering
+    // within each group stays name/catnum. Sits on the reactive chain, so
+    // ticking an entry re-sorts the visible list immediately.
     private val itemsWithQuery = currentQuery.flatMapLatest { query ->
-        itemsWithTypes.map { items -> filterByQuery(items, query) }
+        itemsWithTypes.map { items ->
+            filterByQuery(items, query).sortedWith(
+                compareByDescending<SatItem> { it.isSelected }
+                    .thenBy { it.name }
+                    .thenBy { it.catnum }
+            )
+        }
     }
 
     override fun getCurrentTypes() = currentTypes.value

core/data/src/test/java/com/rtbishop/look4sat/core/data/repository/SelectionRepoSearchTest.kt

@@ -284,6 +284,24 @@ class SelectionRepoSearchTest {
         assertEquals(sampleItems.map { it.catnum }.toSet(), results.map { it.catnum }.toSet())
     }
 
+    @Test
+    fun `selected satellites are shown first`() = runTest {
+        // Pinning ported from upstream: ticked satellites sort above the rest,
+        // each group keeping the name order.
+        val repo = createRepo(
+            items = listOf(
+                SatItem(catnum = 44444, name = "Zeta"),
+                SatItem(catnum = 25544, name = "Alpha"),
+                SatItem(catnum = 40967, name = "Beta")
+            )
+        )
+        val flow = repo.getEntriesFlow()
+        repo.setSelection(listOf(40967), true)
+        val results = flow.first()
+        assertEquals(listOf(40967, 25544, 44444), results.map { it.catnum })
+        assertEquals(listOf(true, false, false), results.map { it.isSelected })
+    }
+
     private fun createRepo(
         items: List<SatItem>,
         sstvIds: List<Int> = emptyList()