Extract pages into lib/page/ modules; thin down bbs.rb

Each page is now a self-contained module with a configure(tui) class
method. Shared helpers live in TUIHelpers. bbs.rb is reduced to
constants, chrome, and wiring.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

lib/page/games_page.rb

@@ -0,0 +1,41 @@
+# frozen_string_literal: true
+
+module GamesPage
+  def self.configure(tui)
+    tui.page :games do
+      enter { @page_title = 'GAME CATALOG'; @items = CATALOG.fetch; @item_sel = 0 }
+
+      render do
+        if @items.empty?
+          text 'No games found.', x: CONT_X, y: CONT_Y, style: THEME[:normal]
+        else
+          game  = @items[@item_sel]
+          links = game.external_links
+
+          text "#{@item_sel + 1}/#{@items.size}  #{game.title}"[0, cont_w],
+               x: CONT_X, y: CONT_Y, style: THEME[:bright]
+          text "#{game.platform}  ·  #{game.author}"[0, cont_w],
+               x: CONT_X, y: CONT_Y + 1, style: THEME[:normal]
+
+          story_rows = cont_h - 4 - links.size
+          wordwrap(game.story, cont_w).first(story_rows).each_with_index do |l, i|
+            text l, x: CONT_X, y: CONT_Y + 3 + i, style: THEME[:normal]
+          end
+
+          link_y = CONT_Y + cont_h - links.size
+          links.each_with_index do |lnk, i|
+            text "#{tc(:label, lnk[:label])}  #{lnk[:url]}"[0, cont_w],
+                 x: CONT_X, y: link_y + i
+          end
+
+          text '↑↓ navigate  q back', x: CONT_X, y: CONT_Y + cont_h, style: THEME[:normal]
+        end
+      end
+
+      nav :cycle
+      key('r')     { reload }
+      key('q')     { go :idle }
+      key(:escape) { go :idle }
+    end
+  end
+end