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feat: right-click "what happened around this log" time correlation

Add a context menu on log rows with "что происходило рядом" — shows all events in a +-N second window around the clicked log, across every service and level, without needing a TraceId. Window presets: 1/5/15/60s.

Time bounds are built from the log timestamp in UTC, matching how both the Lucene and in-memory query compilers parse @timestamp (AssumeUniversal -> UtcTicks), so the window lines up with the stored instants.

Routed through a per-row ILogRowActions callback so the MenuFlyout binds to the row item command directly (RelativeSource into a flyout is unreliable).