[web-shared]: timestamp tooltips, toast adapter, loading skeletons, and encrypted data detection

[karthikscale3]

Changes:

• Timestamp tooltips — Added a new TimestampTooltip component that shows UTC time, local time, and relative time ("3 hours ago") on hover for all timestamp fields in the event list and entity detail sidebar. Wrapped the event list view and detail panel with TimestampTooltipProvider.

• Toast adapter abstraction — Replaced direct sonner toast imports with a useToast hook backed by a ToastContext. This lets host apps (e.g. vercel-site with Geist) supply their own toast implementation via ToastProvider, while falling back to sonner by default. Exports ToastAdapter, ToastProvider, and useToast from the package index.

• Improved loading skeletons — Rewrote the RowsSkeleton and header skeleton in the event list to match the actual column layout (gutter, chevron, time, event type, name, correlation ID, event ID) instead of generic placeholders. Increased skeleton row count from 8 to 16.

• Encrypted data detection for lazy-loaded events — The decrypt button now also appears when expanded event rows contain encrypted markers in their lazily-loaded eventData, not just inline data. Uses a sticky onEncryptedDataDetected callback from EventRow to the parent.

• Expanded event type support in sidebar — Added step_retrying, run_failed, wait_created, and wait_completed to the set of event types that show expandable data in the sidebar events list.