feat(execution-history): restore parity gaps from the old runs UI

[aryasaatvik]

What

Restores the user-facing affordances the execution-history plugin dropped when it replaced the old observability runs UI (a952d08ad). Scoped from a full old-vs-new audit; Groups A + B (all client-side — no API/store changes).

Timestamps

• HoverCardTimestamp (new) — hovering a timestamp reveals epoch / UTC / local-tz / relative renderings, each click-to-copy. On the list-row started cell (keeps its relative-time display) and the drawer's Started/Completed. Native Date/Intl, reusing the shared Radix HoverCard (no date-fns).

List

• Log column — optional column counting [error]/[warn] lines from the row's logsJson (off by default; toggle in view options). Case-insensitive.
• Slow-run highlight — durations > 5s render in the destructive color.
• Code preview widened 80 → 160 chars.
• Toolbar row count ("N of M"); end-of-history footer; empty-state hint line.

Filters / controls

• Last 15m time-range preset; title hints on Live/Refresh buttons.

Chart

• Seconds-resolution axis + tooltip for sub-minute buckets; tooltip escapes the view box and ignores pointer events.

Persistence

• Column visibility persists across reloads (localStorage, comma-joined keys — no JSON.parse).

Deferred (called out, not done here)

• Filter-state persistence — needs a RunsFilters schema (the repo lints against JSON.parse) and is better paired with URL params for shareability.
• tool: / code: / duration_ms: filters + Tools facet — these need API + store changes (cross-collection tool faceting especially), so they belong in a separate PR next to the data work.

Verification

oxfmt --check, oxlint, turbo typecheck (9 packages), plugin tests (17) all pass. UI-only; no API, store, or event-contract changes — independent of the in-flight data/actor work.

[greptile-apps]

Greptile Summary

This PR restores a set of UI affordances dropped from the old runs page: a HoverCardTimestamp component with click-to-copy epoch/UTC/local/relative values, a log error/warn count column, slow-run highlighting, sub-minute chart resolution, column-visibility persistence in localStorage, row-count display, "End of history" footer, and a "Last 15m" time preset.

• HoverCardTimestamp is a self-contained new component using only native Date/Intl; closeDelay={150} addresses the previous review concern about premature card close.
• Column persistence uses a comma-joined key=0|1 format (no JSON.parse), and readStoredColumns correctly seeds from DEFAULT_COLUMNS before applying stored values, so future new columns keep their defaults for existing users.
• All changes are UI-only with no API, store, or event-contract modifications.

Confidence Score: 5/5

Safe to merge — all changes are purely client-side UI with no API, store, or event-contract modifications.

Every changed file is UI-only. The column persistence logic correctly merges stored values over DEFAULT_COLUMNS so new columns never silently inherit hidden state for existing users. The HoverCardTimestamp component is well-isolated, uses only native APIs, and the portal-rendered content avoids any nested-interactive-element issues. The only finding is a stale outer comment on readStoredColumns that contradicts the implementation — the code itself behaves correctly.

No files require special attention beyond the comment fix in RunsPage.tsx.

Important Files Changed

Filename	Overview
packages/plugins/execution-history/src/react/RunsPage.tsx	Adds column-visibility persistence (localStorage, comma-join format) and a row-count display. The read logic correctly merges stored values over DEFAULT_COLUMNS so future new columns keep their defaults; the outer comment above the function contradicts the implementation.
packages/plugins/execution-history/src/react/hover-card-timestamp.tsx	New component — hover reveals epoch/UTC/local-TZ/relative renderings with click-to-copy. closeDelay set to 150ms (previous review concern addressed). Click propagation stopped correctly on CopyRow; portalled HoverCardContent avoids nested-button HTML issues.
packages/plugins/execution-history/src/react/run-row.tsx	Adds HoverCardTimestamp for the Started cell, log error/warn counts column (gated by columns.log), and slow-run destructive highlight for durationMs > 5000. Log parsing is lazy (skipped when column is off). Code preview widened to 160 chars.
packages/plugins/execution-history/src/react/detail-drawer.tsx	Started and Completed MetaCards now use HoverCardTimestamp. Null-completedAt branch falls back to formatDateTime(null) which returns "Pending" — correct and type-safe.
packages/plugins/execution-history/src/react/timeline-chart.tsx	Seconds-resolution axis/tooltip for sub-minute buckets (≤60 000 ms); tooltip escape and pointer-events fix are straightforward Recharts prop additions.
packages/plugins/execution-history/src/react/shell.tsx	Adds "End of history" footer when !hasMore && !isLoadingMore. Correctly guarded inside the !isEmpty branch so it never shows when the empty state is displayed.
packages/plugins/execution-history/src/react/filter-rail.tsx	Adds a "Last 15m" preset (15 * 60 * 1000 ms) at the head of TIME_RANGE_PRESETS. Straightforward and correctly ordered.
packages/plugins/execution-history/src/react/view.ts	Adds the "log" column key with default false to RunColumns, DEFAULT_COLUMNS, and RUN_COLUMN_LABELS. All three locations updated consistently.

Flowchart

%%{init: {'theme': 'neutral'}}%%
flowchart TD
    A[RunsPage mount] --> B[readStoredColumns]
    B --> C{localStorage has\nexecutionHistory.columns?}
    C -- No --> D[Return DEFAULT_COLUMNS]
    C -- Yes --> E[Seed next from DEFAULT_COLUMNS]
    E --> F[Override only stored key=value pairs]
    F --> G[New columns keep default visibility]
    G --> H[columns state initialized]
    H --> I[useEffect: columns changed]
    I --> J[serializeColumns → write to localStorage]

    H --> K[RunListRow render]
    K --> L{columns.log?}
    L -- Yes --> M[logLines logsJson\ncount errors/warns]
    L -- No --> N[logs = empty array]
    M --> O[Display Log column with E/W counts]

    K --> P[HoverCardTimestamp timestamp=startedAt]
    P --> Q{Hover?}
    Q -- Yes --> R[Show epoch / UTC / local / relative\neach click-to-copy]
    Q -- No --> S[Show formatRelative display]

    K --> T{durationMs > 5000?}
    T -- Yes --> U[text-destructive]
    T -- No --> V[text-muted-foreground]

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_{Reviews (2): Last reviewed commit: "fix(execution-history): address drawer p..." | Re-trigger Greptile}