Currently Listening: finished is 90% played, not read

Opening an episode marks it read, so filtering on read hid every
episode anyone had started. The player now also reports the length it
measured, filling in one the feed left out. Fixes #14.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

src/web.rs

@@ -1374,6 +1374,8 @@ async fn media(
 #[derive(Deserialize)]
 struct Position {
     secs: i64,
+    /// The length the player measured, for an episode whose feed gives none.
+    duration: Option<i64>,
 }
 
 async fn set_position(
@@ -1382,7 +1384,7 @@ async fn set_position(
     user: crate::db::User,
     Json(body): Json<Position>,
 ) -> Result<StatusCode, ApiError> {
-    state.ctx.db.set_position(user.id, &feed_id, &guid, body.secs)?;
+    state.ctx.db.set_position(user.id, &feed_id, &guid, body.secs, body.duration)?;
     Ok(StatusCode::NO_CONTENT)
 }