feat: разделение контента — на телефон только аудио, на очки только видео

Телефон качает audio-N.ogg (audioKeys вместо fileKeys, стадия «звук»),
очки получают DownloadFiles только с video.mkv (buildGlassesFileSpecs).
Watch проверяет готовность обоих: телефон — audioReady(), очки — как
было; отказ с подсказкой «Скачать на телефон/очки». Тесты: lib-core 19,
phone 36.

app-phone/src/test/kotlin/pw/binom/viewmate/phone/DownloadManagerTest.kt

@@ -55,7 +55,7 @@ class DownloadManagerTest {
 
         assertTrue(result.downloaded.isEmpty())
         assertEquals(
-            DownloadProgress("i2", DownloadPhase.DOWNLOADING, 50, "видео"),
+            DownloadProgress("i2", DownloadPhase.DOWNLOADING, 50, "звук"),
             result.progress["i2"],
         )
     }
@@ -68,7 +68,7 @@ class DownloadManagerTest {
 
         val result = scanDownloads(base, emptyMap())
 
-        assertEquals(DownloadProgress("i3", DownloadPhase.DOWNLOADING, 0, "видео"), result.progress["i3"])
+        assertEquals(DownloadProgress("i3", DownloadPhase.DOWNLOADING, 0, "звук"), result.progress["i3"])
     }
 
     @Test
@@ -131,6 +131,27 @@ class DownloadManagerTest {
         assertEquals(listOf("video", "audio-0", "audio-1"), fileKeys(files))
     }
 
+    @Test
+    fun audioKeysFromMirrorCoversOnlyAudios() {
+        val files = MirrorFiles(
+            video = MirrorVideo(key = "v", url = "http://v"),
+            audios = listOf(
+                MirrorAudio(index = 0, key = "a0", url = "http://a0"),
+                MirrorAudio(index = 1, key = "a1", url = "http://a1"),
+            ),
+        )
+        assertEquals(listOf("audio-0", "audio-1"), audioKeys(files))
+    }
+
+    @Test
+    fun audioKeysEmptyWithoutAudios() {
+        val files = MirrorFiles(
+            video = MirrorVideo(key = "v", url = "http://v"),
+            audios = emptyList(),
+        )
+        assertTrue(audioKeys(files).isEmpty())
+    }
+
     @Test
     fun isFullyOnDiskRequiresAllFilesNoParts() {
         val base = newBaseDir()

app-phone/src/test/kotlin/pw/binom/viewmate/phone/GlassesFilesTest.kt

@@ -38,11 +38,9 @@ class GlassesFilesTest {
 
         assertEquals("movie-1", msg.itemId)
         assertEquals("Interstellar", msg.title)
-        assertEquals(3, msg.files.size)
+        assertEquals(1, msg.files.size)
         assertEquals("video.mkv", msg.files[0].name)
         assertEquals("https://s3/mirror/video.mkv?sig", msg.files[0].url)
-        assertEquals("audio-0.ogg", msg.files[1].name)
-        assertEquals("audio-1.ogg", msg.files[2].name)
     }
 
     @Test
@@ -56,8 +54,6 @@ class GlassesFilesTest {
         )
 
         assertEquals(1_863_946_240L, msg.files[0].sizeBytes)
-        assertEquals(68_157_440L, msg.files[1].sizeBytes)
-        assertEquals(0L, msg.files[2].sizeBytes)
     }
 
     @Test
@@ -67,8 +63,9 @@ class GlassesFilesTest {
             sizes = emptyMap(),
             presign = { "signed-$it" },
         )
-        assertEquals(3, specs.size)
+        assertEquals(1, specs.size)
         assertTrue(specs.all { it.url.startsWith("signed-") })
+        assertEquals("video.mkv", specs.single().name)
     }
 
     @Test