gephi / graphstore / #612

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Look up time view indexes under the table lock and support disabled time indexing (#321)

TimeIndexStore read viewIndexes outside the table lock in clear(view), indexView, indexInView and clearInView, and clear(view) mutated the view index without the lock while addTimestamp could change it concurrently. With time indexing disabled, these methods and deleteViewIndex threw NullPointerException, breaking view fill, not, clear, element add/remove and destroyView. The visible view field is now volatile, and the visible graph getters document holding the read lock.

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

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