fix: eliminate token refresh race condition with shared promise - #5
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Replace the module-level refreshing boolean + queue array with a single shared Promise. The promise is set synchronously so there is no window between checking and setting where concurrent requests can each trigger their own refresh call. Subsequent requests simply await the same promise instead of being queued.
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Replace the module-level refreshing boolean + queue array with a single shared Promise. The promise is set synchronously so there is no window between checking and setting where concurrent requests can each trigger their own refresh call. Subsequent requests simply await the same promise instead of being queued.