[web-shared][web] Fix events tab search

[karthikscale3]

Summary

• Replace client-side Events tab substring search with server-backed exact ID lookup
• Support full correlation IDs (step_, wait_, hook_) and event IDs (evnt_)
• Show loading skeleton while fetching, toast on Enter with partial IDs, and scoped results to the current run

Test plan

• Open a workflow run in @workflow/web → Events tab
• Paste a full step_* ID → verify all step events load (including those not on the first page)
• Paste a full evnt_* ID → verify single event loads
• Paste a full wait_* / hook_* ID → verify correlated events load
• Paste a partial ID and press Enter → verify toast: "Enter a full correlation ID or event ID"
• Clear search → verify default paginated list returns
• Change sort order during an active search → verify results re-fetch in new order
• Run pnpm --filter @workflow/web-shared test -- exact-event-search-id.test.ts

Made with Cursor