Port the trainer card and the play time

The player's name in the start menu opens TrainerCard: page 1 with the
name, ID, money, Pokédex count and play time, page 2 with the Johto
leaders and the badges owned, turned and closed with the original
buttons. The card picture, leader faces and animated badges come from the
ROM with _CGB_TrainerCard's palettes. GameTimer now counts the play time
from the end of the introduction, capped at 999:59:59, and saves keep it.

Closes #23

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

docs/ARCHITECTURE.md

@@ -86,7 +86,10 @@ is a `pokegear` effect answered with a button, and a phone call runs the
 callee's ROM script in the event interpreter on the same draft. The world
 keeps the card on screen (`world.pokegear`) during the call's texts.
 `scripts/mom.ts` runs `BankOfMom` as a special; its amount box is a
-`mombank` effect answered with buttons in the same way.
+`mombank` effect answered with buttons in the same way, and so are the
+pages of `scripts/trainer-card.ts`. The world refreshes the card's play
+time, colon and badge step every tick; `world/game-time.ts` is the play
+time (`wGameTime`), which the world advances two frames per tick.
 
 `TilesetAnimator` translates the ROM animation command tables, advancing two
 video frames per overworld tick. It owns mutable graphics separately from the