feat(android): a downloads page of rows under each show

Saved episodes are list rows with their still, the episode's name rather
than its file, and its size, under a heading per show; the page opens
with how much is on the device. Downloads still arriving come first, with
pause or resume and cancel as icons beside the progress. Deleting a saved
episode now asks first, since getting it back is a download.

android/app/src/test/java/io/narl/protonstream/ui/ScreenshotTest.kt

@@ -24,6 +24,7 @@ import org.robolectric.RobolectricTestRunner
 import org.robolectric.annotation.Config
 import org.robolectric.annotation.GraphicsMode
 import uniffi.pstr_android.EpisodeRecord
+import uniffi.pstr_android.OfflineRecord
 import uniffi.pstr_android.SeasonRecord
 import uniffi.pstr_android.ShareRecord
 import uniffi.pstr_android.StorageUsageRecord
@@ -125,6 +126,16 @@ class ScreenshotTest {
         HistoryScreen(LIBRARY, { _, _ -> }, {}, { _, _ -> }, PaddingValues(), ZoneOffset.UTC, LocalDate.of(2026, 9, 21))
     }
 
+    @Test
+    fun `the downloads page with a season saved`() = capture("downloads-phone") {
+        val saved = SERIES.seasons.first().episodes.take(2).map {
+            OfflineRecord(it.shareId, it.linkId, "revision", 1_300_000_000uL, it)
+        }
+        // One title: the fixtures reuse link ids across titles, so with the
+        // whole library the episodes would be filed under whichever came last.
+        DownloadsScreen(LIBRARY.copy(titles = listOf(SERIES), offline = saved), {}, {}, {}, {}, PaddingValues())
+    }
+
     @Test
     fun `the downloads page with nothing offline`() = capture("downloads-empty") {
         DownloadsScreen(LIBRARY, {}, {}, {}, {}, PaddingValues())