Breed at the Day-Care, hatch Eggs, draw MAIL stationery and browse the Hall of Fame (Closes #29)

- Day-Care and breeding: deposits, withdrawal pricing and growth,
  compatibility, egg species, DVs and moves, DayCareStep, egg
  collection and the Odd Egg, compared with the cartridge's routines.
- CountStep: walking happiness, DoEggStep, DayCareStep and DoBikeStep
  in the original's order; HatchEggs with the ROM's hatch animation,
  compared frame by frame with the original.
- MAIL: all ten stationery types and the Portrait MAIL picture,
  compared with the cartridge's tilemaps, graphics and palettes.
- Printing: Bill's PC boxes, Pokedex PRNT, MAIL and the Photo Studio
  take the original's absent-printer path.
- Hall of Fame records (saved apart from the League flag, ready for the
  League to call) and the Hall of Fame PC, compared with the cartridge's
  _HallOfFamePC on 255 pages.

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

tests/foundation-browser.spec.ts

@@ -570,6 +570,15 @@ test("MAIL is written when given, and read from the party menu", async ({
     "HELLO, CHRIS!   \nSEE YOU!",
   );
   await expect(page.locator("#mail-author")).toHaveText("CHRIS");
+  await expect(page.locator("#mail-canvas")).toBeVisible();
+  await page.keyboard.press("Enter");
+  await expect(letter).toBeHidden();
+  await expect(page.locator("#tile-screen-canvas")).toHaveAttribute("aria-label", /Printer Error 2/);
+  await page.keyboard.press("KeyX");
+  await expect(page.locator("#tile-screen")).toBeVisible();
+  await page.keyboard.press("KeyZ");
+  await expect(letter).toBeVisible();
+  await expect(page.locator("#mail-message")).toHaveText("HELLO, CHRIS!   \nSEE YOU!");
   await page.locator("#mail-close").click();
   await expect(letter).toBeHidden();
   await expect(page.locator("#game-notice")).toHaveText("");