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/SESSION_HANDOFF.md

@@ -886,3 +886,46 @@ run. Not committed.
 
 Next: the trainer card and options; later the Fly map and Teleport/Dig
 warps.
+
+## Trainer card and play time: 2026-10-01
+
+Resumed with "continue the plan" after `38b9562` (clean tree), taking the
+recorded next item (the trainer card, board card #23). The Pokégear and
+Mom's bank above were committed as `209778c`.
+
+- `src/game/scripts/trainer-card.ts` (`TrainerCard`): the player's name in
+  the start menu runs the card and returns to the start menu. Each page is
+  a `trainercard` effect answered with a button (a `buttonChoice` like the
+  Pokégear): page 1 A/right → page 2; page 2 A leaves, left → page 1; B
+  leaves from both. The Kanto page (unreferenced code) is not shown. Labels
+  from `.Name_Money`, `.Dex_PlayTime` and `.Badges`; the Pokédex line only
+  with `ENGINE_POKEDEX`; badges from the Johto badge engine flags.
+- `src/game/world/game-time.ts`: `wGameTime` and `GameTimer` (60 frames a
+  second, capped at 999:59:59.00). `GameWorld.gameTime` advances two
+  frames per tick unless the introduction is pending; `beginIntro` resets
+  it. `save()` during a scene returns the committed state with the current
+  play time. Saves gained `gameTime`, migrated by absence to zero.
+- The world refreshes the card's time, blinking colon (every 32 frames on
+  page 1) and badge step (every 8 frames on page 2, only with badges) each
+  tick, counting from the page load.
+- `src/game/rendering/trainer-card.ts`: the Chris/Kris card picture
+  (tile $1c left blank, as the corner covers it) and page 2's leader faces
+  with the owned badges' sprites, coloured by `_CGB_TrainerCard`'s
+  attribute map. UI: `#trainer-card` panel, frame colour from the other
+  gender's palette; checked visually at desktop and 390px widths.
+- New `TRAINER_CARD` profile table, OW constants (`ENGINE_MINERALBADGE`,
+  `NUM_JOHTO_BADGES`, `PREDEFPAL_CGB_BADGE`, the leaders' trainer classes).
+  `check:reference` now understands the `trainerclass` macro.
+- Tests that compare a save before and after a refused or rolled-back
+  action now ignore the play time (`withoutPlayTime` in
+  `tests/world-driver.ts`), which keeps counting.
+
+Checks: 407 unit tests with the local ROM (134 passed, 273 skipped without
+it; new `tests/trainer-card.test.ts`); 117 Chromium/WebKit browser tests
+passed, 19 skipped intentionally (a new trainer card flow in both
+browsers); native and reference builds; reference, vendor and release
+checks; `git diff --check`. No emulator comparison of the card; no CI or
+physical-device run.
+
+Next: the options screen (board #24), then the Fly map and Teleport/Dig
+warps.