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/app/routes/plex/discover.py

@@ -25,7 +25,6 @@ from app.models import PlexItem, PlexShow, PlexState, User
 from app.plex import rollup
 from app.plex.cards import (
     SHOW_NEW,
-    ShowState,
     display_title,
     leaf_card,
     movie_card,
@@ -239,7 +238,7 @@ def _continue_watching(
         # `apply_show_state_filter` the grid uses, so the rail can't drift from the grid's definition.
         prog = rollup.agg_subquery(db, uid, include_resumed=True).subquery()
         sq = apply_show_state_filter(
-            select(PlexShow, prog.c.resumed_at, prog.c.inprog).join(
+            select(PlexShow, prog.c.resumed_at, prog.c.total, prog.c.watched, prog.c.inprog).join(
                 prog, prog.c.show_id == PlexShow.id
             ),
             prog.c.total,
@@ -252,8 +251,8 @@ def _continue_watching(
             .order_by(prog.c.resumed_at.desc().nullslast())
             .limit(RAIL_LIMIT)
         ).all()
-        for sh, resumed_at, inprog in srows:
-            state = ShowState("in_progress", (inprog or 0) > 0)
+        for sh, resumed_at, total, watched, inprog in srows:
+            state = rollup.show_state(total, watched, inprog)
             rows.append((resumed_at, show_card(sh, state, lang=lang)))
 
     rows.sort(key=lambda r: r[0] or rollup.NO_TS, reverse=True)