gephi / graphstore / #611

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Check view existence under the lock and reject destroyed views in index getters (#320)

createView, destroyView and setTimeInterval checked the view before taking the write lock, so a racing destroyView could leave them copying stale state into a new view. The index getters created a view index for a destroyed view that was never deleted. setTimeInterval on the main view threw ClassCastException instead of IllegalArgumentException.

Co-authored-by: Claude Sonnet 5.5 <noreply@anthropic.com>

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