Investigate potential race condition in UnitDisplay.tick() buildables updates

[coderabbitai]

Description

In src/client/graphics/layers/UnitDisplay.ts, the tick() method calls player.buildables(undefined, BuildMenus.types) without guarding against overlapping requests or handling promise rejections.

Potential Issues

1. Race condition: If tick() is called multiple times before the first promise resolves, older responses may overwrite newer state in this.playerBuildables.
2. Unhandled rejections: Missing .catch() handler could allow unhandled promise rejections.

Context

This was flagged during review of PR #3220 but deferred for separate investigation.

Requested by: @VariableVince
PR: #3220
Review comment: #3220 (comment)

Next Steps

Verify whether the race condition can occur in practice and whether error handling is needed.

[VariableVince]

@iiamlewis why close? This hasn't been investigated nor (if needed) solved yet?