feat(gen2): share battle UI visibility hooks

docs/mod-api-gen2-compat.md

@@ -533,8 +533,9 @@ gains a field instead of the name gaining a prefix.
   `pokemon.level_up`, `pokemon.move_learned`; hooks `battle.damage`,
   `battle.crit`, `battle.accuracy`, `battle.turn_order`,
   `battle.enemy_action`, `battle.run`, `battle.exp_award`, `exp.gain`,
-  `catch.rate`, `trainer.party`, `battle.overlay`, `battle.low_health_alarm`
-  and `battle.catch_exp`. One payload difference: Gen 1's vanilla
+  `catch.rate`, `trainer.party`, `battle.overlay`, `battle.low_health_alarm`,
+  `battle.catch_exp`, `battle.bottom_ui_visible` and
+  `battle.status_hud_visible`. One payload difference: Gen 1's vanilla
   `battle.low_health_alarm` link reads `ctx.battle.data`, and Gold's battle
   screen has no `.data` field, so the Gen 2 site **adds** `ctx.data` beside the
   Gen 1 keys. A mod that calls `nextFn` is unaffected; one that reaches through

docs/modding.md

@@ -455,6 +455,7 @@ identifiers: `pc_box_withdraw`, `pc_box_deposit`, `pc_box_release`,
 `battle.bottom_ui_visible` and `battle.status_hud_visible` independently
 control the battle text/menu layer and the HP/status panels. Both receive
 `(next, state)` and default to `true`, so vanilla rendering is unchanged.
+Both hooks apply to Gen 1 and Gen 2 battles.
 Text boxes and YES/NO prompts pushed above a battle inherit a `false` result
 for that battle, so hiding the bottom layer cannot leave their white backing
 behind under another overlay. Text boxes also pass through the hook as their