Crystal synthesis in BuyPremiumAsync is now unconditional: always remove
any crystal entry ApplyAsync may have added, then append the fresh
post-deduction total. Prevents stale on-screen balances when a retroactive
grant also touches crystal (or when no grants fire and the conditional
guard would have been the only crystal entry).
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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