feat(admin): add an 'open' filter to the console games list

The games-list status filter offered only active/finished; add 'open' (auto-match games awaiting an opponent) to the subnav and accept it in normalizeGameStatus. Render test covers the new filter link.

backend/internal/adminconsole/render_test.go

@@ -31,6 +31,7 @@ func TestRendererRendersEveryPage(t *testing.T) {
 			FlagThreshold: 1000, FlagWindow: "10m0s",
 		}, "Recent episodes"},
 		{"games", GamesView{Items: []GameRow{{ID: "g1", Variant: "scrabble_en", Status: "active"}}, Status: "active", Pager: NewPager(1, 50, 1)}, "g1"},
+		{"games", GamesView{Items: []GameRow{{ID: "g-open", Variant: "scrabble_en", Status: "open"}}, Status: "open", Pager: NewPager(1, 50, 1)}, "?status=open"},
 		{"game_detail", GameDetailView{ID: "g1", Variant: "scrabble_en", Seats: []SeatRow{{Seat: 0, DisplayName: "Kaya"}}}, "Seats"},
 		{"complaints", ComplaintsView{Items: []ComplaintRow{{ID: "c1", Word: "qi", Status: "open"}}, Status: "open", Pager: NewPager(1, 50, 1)}, "qi"},
 		{"messages", MessagesView{Items: []MessageRow{{ID: "m1", SenderID: "a1", SenderName: "Kaya", Source: "telegram", Body: "good luck", GameID: "g1"}}, Pager: NewPager(1, 50, 1)}, "good luck"},

backend/internal/adminconsole/templates/pages/games.gohtml

@@ -3,6 +3,7 @@
 {{with .Data}}
 <nav class="subnav">
 <a href="/_gm/games"{{if eq .Status ""}} class="active"{{end}}>all</a> ·
+<a href="/_gm/games?status=open"{{if eq .Status "open"}} class="active"{{end}}>open</a> ·
 <a href="/_gm/games?status=active"{{if eq .Status "active"}} class="active"{{end}}>active</a> ·
 <a href="/_gm/games?status=finished"{{if eq .Status "finished"}} class="active"{{end}}>finished</a>
 </nav>