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>

CHANGELOG.md

@@ -34,6 +34,9 @@ The long form, with what was wrong before and how it was found, is in
 
 ### Fixed
 
+- Currently Listening lists the episodes you have started. It left out anything marked read, and
+  opening an episode marks it read, so it usually showed nothing. An episode now leaves the list
+  once 90% of it has played.
 - A WordPress post that embeds the file it encloses no longer lists, and downloads, that file
   twice. Items that already had it twice are folded into one at startup, and the spare copy
   deleted.