fix: Load announcements with associated statuses correctly (#987)

The `Status` type associated with an announcement is entirely different
to the regular `Status` type, with a different JSON shape. The incorrect
type meant a deserialisation error when loading announcements with
associated statuses.

core/network/src/main/kotlin/app/pachli/core/network/model/Announcement.kt

@@ -31,7 +31,7 @@ data class Announcement(
     @Json(name = "updated_at") val updatedAt: Date,
     val read: Boolean,
     val mentions: List<Status.Mention>,
-    val statuses: List<Status>,
+    val statuses: List<AnnouncementStatus>,
     val tags: List<HashTag>,
     val emojis: List<Emoji>,
     val reactions: List<Reaction>,
@@ -57,4 +57,10 @@ data class Announcement(
         val url: String?,
         @Json(name = "static_url") val staticUrl: String?,
     )
+
+    @JsonClass(generateAdapter = true)
+    data class AnnouncementStatus(
+        val id: String,
+        val url: String,
+    )
 }