macOS: load lang/ + sound/aac/, dress up Set username dialog

[devin-ai-integration]

Summary

Three macOS-only fixes for the bugs reported in the last test pass (broken Options text, silent game, near-invisible username dialog). All on top of 7f3f64f.

1. Options/Game settings text was rendering as raw keys — AppPlatform_macOS::readAssetFile was modeled on the iOS port and stripped both the directory and the extension from the requested asset path. The iOS bundle is flat; ours mirrors the source data/ tree, so lang/en_US.lang was being looked up as en_US.lang only under Resources/images/ and the bundle root. The lookup failed → I18n::loadLanguage loaded zero strings → every I18n::get(id) fell back to return id + '<'; (literal < suffix), so the in-game Options screen showed labels like options.group.mojang< instead of Account. Hard-coded ASCII strings (Armor, Survival, Creative) kept working, which matches what the user saw on-device. Fix: keep the subdirectory in filename, only strip the extension — findBundleResource already searches the raw subdir (lang/, etc.) as a fallback.

2. The game was completely silent — SoundEngine::_pp called [NSBundle pathForResource:fn ofType:@"m4a"] with no inDirectory:. Apple's pathForResource:ofType: only scans the top of Resources/ and *.lproj children. The Makefile copies handheld/data/sound/aac/<category>/<file>.m4a into the bundle, so every lookup returned nil and no clip ever loaded. Fix: try the four categories that actually exist on disk (damage, mob, random, step) plus sound/aac/ and sound/ as fallbacks, and only as a last ditch the flat bundle root that iOS uses.

3. The Set username dialog read as "there's no window at all" — DIALOG_SET_USERNAME was using the generic accessory path with rows == 1, no label, no informative text, a "Name" placeholder and a thin 32-tall accessory frame. Visually it collapsed to a thin unlabelled strip under the Set username title. Fix: lay out rows as <label> | <control> (so even a one-row dialog has a clearly captioned field), give the username dialog its own Username: caption + Username placeholder + an informative-text sentence, and pre-fill the field from the saved mp_username so it's obvious the field is editable.

Review & Testing Checklist for Human

This is yellow risk — the changes are scoped to three small areas but I could not run a real macOS build on this box; CI is the first integration test. Please double-check:

• Open the in-game Options screen on the built .app — the tab labels (Account, Game, Controls, Graphics) and per-row captions should now be real English text instead of options.group.mojang< style keys.
• Sounds: place/break a block, take fall damage, hit a mob — confirm at least one clip plays. Console will print MyGetOpenALAudioData: errors if a lookup still fails.
• On the Options screen, tap the username button — the Set username NSAlert should now show a labelled Username: field pre-filled with the current name, with an informative line under the title.
• World creation / rename still work — the same dialog code path was touched. Each field should now show its own caption (Name:, Seed:, Game mode:).

Notes

I deliberately did not touch the player-preview rendering in ArmorScreen (reported as "the player is not shown"). The relevant code (ArmorScreen::renderPlayer, MobRenderer::render, PlayerRenderer) hasn't changed since the initial commit, and I couldn't reproduce or debug it without a Mac — I'd rather not start poking at GL state blindly. If after this PR the Options text + sound look right but the armor-preview player is still missing, I'll do a focused follow-up for that one specifically (likely a GL state issue around alpha test / texture binding when entering the inventory screen).

The <name> wow\ line in the screenshots is not a bug — the local player's default name is the literal string "name" (see Player.cpp), and <name> is the chat prefix wrapped around it.

Link to Devin session: https://app.devin.ai/sessions/5a7050a439284734a4b5702cd21fd2b7
Requested by: @j92580498-max

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