fix(plex): the rails' Restart comes from the one rollup; plain text decodes whole entity names only

Both Continue-watching rails built a show's card state inline; they now take it from rollup.show_state, so a show part watched with nothing to resume offers Play alone there too. A named reference counts only when its whole name is an HTML5 entity: html.unescape still decoded the legacy "&not" inside "&notice;". Tests cover the grid's in-progress-but-not-resumable case through its SQL and both rails.

backend/tests/test_plex_query_conversion.py

@@ -220,15 +220,18 @@ class TestRollup:
             for i in _get(db, user, monkeypatch, override_dep, "/api/plex/library").json()["items"]
         }
         assert cards["s1"]["resumable"] is True
+        # e1 finished, e2 untouched: in progress, but nothing to resume
+        e1 = db.execute(select(PlexItem).where(PlexItem.rating_key == "e1")).scalar_one()
         db.execute(
-            delete(PlexState).where(PlexState.user_id == user.id, PlexState.position_seconds > 0)
+            delete(PlexState).where(PlexState.user_id == user.id, PlexState.item_id == e1.id)
         )
+        db.add(PlexState(user_id=user.id, item_id=e1.id, status="watched"))
         db.commit()
         cards = {
             i["id"]: i
             for i in _get(db, user, monkeypatch, override_dep, "/api/plex/library").json()["items"]
         }
-        assert cards["s1"]["resumable"] is False
+        assert (cards["s1"]["status"], cards["s1"]["resumable"]) == ("in_progress", False)
 
 
 def _fake_paginate(by_type):