Port the options screen

OPTION in the start menu runs _Option with the ROM's labels and settings,
OptionsControl's cursor wrapping and each option's bit handling. The four
option bytes live in the script state and saves, defaulting to
DefaultOptions. The battle style now decides whether a trainer's next
Pokémon brings an offer to switch, and the menu account whether the start
menu describes its items; the other settings are kept for later.

Closes #24

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

docs/SESSION_HANDOFF.md

@@ -929,3 +929,40 @@ physical-device run.
 
 Next: the options screen (board #24), then the Fly map and Teleport/Dig
 warps.
+
+The trainer card increment was committed as `4769856` (`Closes #23`; the
+hook moved the card to Fait). Not pushed.
+
+## Options: 2026-10-01
+
+Continued in the same session with board card #24.
+
+- `src/game/scripts/options.ts` (`OptionsMenu`): OPTION in the start menu
+  runs `_Option` on `state.options` (the start menu's draft) and returns to
+  the start menu. `options` effect answered with buttons; Start/B leave,
+  A on CANCEL leaves; `OptionsControl` wrapping; each option routine ported
+  from its bits (text speed's `.Save` keeps only the high nybble, so bit 3
+  is lost and bit 4 kept). Labels from `StringOptions` (read with a longer
+  `readString` limit), settings from the routines' strings.
+- `GameOptions` = `wOptions`, `wTextboxFrame`, `wGBPrinterBrightness`,
+  `wOptions2`; `defaultOptions()` is `DefaultOptions`. In `ScriptState` and
+  saves (migrated by absence; frame above 7 refused).
+- Consumers: `Battle` takes `shift` (from `BATTLE_SHIFT`) and
+  `CheckWhetherToAskSwitch` honours it; `StartMenu` drops descriptions
+  without `MENU_ACCOUNT`. Text speed, battle scene, sound, print and frame
+  are stored only.
+- New `OPTIONS` profile table and OW option constants, verified by
+  `check:reference` (decimal literals: the checker skips `0b` values, which
+  a deliberately wrong `TEXT_DELAY_MED` confirmed).
+- UI: `#options` panel, labels in a fixed column; checked at desktop and
+  390px widths.
+
+Checks: 413 unit tests with the local ROM (134 passed, 279 skipped without
+it; new `tests/options.test.ts` and a Set-mode test in
+`tests/battle-switch.test.ts`); 119 Chromium/WebKit browser tests passed,
+19 skipped intentionally (a new options flow in both browsers); native and
+reference builds; reference, vendor and release checks; `git diff --check`.
+No emulator comparison; no CI or physical-device run.
+
+Next: the Fly map and Teleport/Dig/Escape Rope warps (board #25), which
+need script commands after a warp; then Headbutt and Rock Smash (#26).