Add library view and series drill-down (M8)

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

internal/ui/help.go

@@ -17,6 +17,20 @@ const helpText = `[yellow]Global[-]
   Enter, a               add the selected title
   i                      interactive release search (library titles)
 
+[yellow]Library[-]
+  m                      switch between movies and series
+  f                      cycle filter (all, missing, downloaded, monitored, unmonitored)
+  /, Tab                 text filter (Enter/Esc/Tab returns to the list)
+  t                      toggle monitored
+  s                      automatic search (series: all missing, asks first)
+  i, Enter               movie: release search; series: seasons and episodes
+  r                      reload
+
+[yellow]Seasons and episodes[-]
+  Enter                  season: expand/collapse; episode: release search
+  i, s, t                release search, automatic search, toggle monitored
+                         (on a season they apply to the whole season)
+
 [yellow]Release list[-]
   Enter, g               grab the selected release
   s                      cycle sort (best, size, age)
@@ -44,5 +58,5 @@ func (a *App) showHelp() {
 		}
 		return ev
 	})
-	a.openModal(tv, 76, 34)
+	a.openModal(tv, 80, 40)
 }