fix(lobbyswitcher): translate the switcher texts

[TheMeinerLP]

Root cause

The lobby switcher's hotbar clock was built once, when the LobbyItem bean was created, with messages.itemName(Locale.ENGLISH). That call renders the translatable component immediately through GlobalTranslator. If the bundle is not yet registered at that point, the render leaves the translatable component untouched, and the name sent to the client is the raw key titan.lobbyswitcher.item.name. Even when it was registered in time, the stored stack was English for every player, because the hotbar equips the same ItemStack instance for everyone.

The reproduction is a clock built before registration, then handed to a German player. Before the fix its name is empty when rendered to plain text (the client shows the raw key), and the German player does not get Lobbys.

The inventory, entry texts and chat messages were already rendered per locale and are covered by existing tests (e.g. SwitcherInventoryTest German viewer). The bundle keys are present in both messages_en.properties and messages_de.properties, and the bundle is registered with GlobalTranslator before the inventory opens.

Fix

• core: LobbyItem gets a localized function (Locale -> ItemStack). The existing 5-argument constructor keeps the stack identical for every player. stackFor(Locale) returns the stack for a locale.
• hotbar: HotbarLobbyItems.equip builds the placements for the player's locale (English when the client has not reported one). The stamped identity tag is applied to localized stacks too, so dispatch keeps working.
• lobbyswitcher: the clock bean no longer renders a name at build time. Its localized function renders titan.lobbyswitcher.item.name for the player's locale at equip time.
• lobbyswitcher: LobbySwitcherMessages.render treats a null locale as English. Players whose client has not sent a locale no longer cause an NPE in the unavailable and click messages.

Texts checked (all keys exist in messages_en and messages_de):

key	en	de
item.name (clock)	Lobbies	Lobbys
title	Lobbies	Lobbys
entry.count	Players: x/y - click to join	Spieler: x/y - Klicken zum Beitreten
state.current	You are here (x/y)	Du bist hier (x/y)
state.full	Full (x/y)	Voll (x/y)
state.not_ready	Not ready yet	Noch nicht bereit
state.unavailable	Lobbies are not available right now	Lobbys sind gerade nicht verfügbar
message.sent / current / full / not_ready / gone / unavailable	see bundle	see bundle

Tests

• LobbySwitcherItemsTest
  • clockBuiltBeforeRegistrationIsNamedWhenGiven: reproduces the live symptom (raw key or empty name) and asserts the German name and non-italic decoration after equip.
  • clockNameFollowsThePlayersLocale: German player sees Lobbys, English player sees Lobbies.
• HotbarLobbyItemsIntegrationTest.equipGivesTheStackOfThePlayersLocale: a localized item gives the German player the German stack.
• LobbySwitcherMessagesBundleTest (existing) checks that every key used by the module exists in both bundles and that the German bundle has the same keys as English.

All tests are Minestom Env based with env.tick() where ticks are needed, no sleeps and no system time.

https://claude.ai/code/session_01GXose9rakuRNZoM3TP3xj1