feat(rank-tracking): add Last checked at column to CSV and Sheets exports

[AdarshJ173]

Summary

Fixes #70 — Rank Tracking exports now include a Last checked at column in both full-table and selected-row CSV and Google Sheets exports.

What changed

RankTrackingTableParts.tsx

• Added a private formatCheckedAt(lastCheckedAt?: string | null): string helper that converts the stored ISO-8601 timestamp to a YYYY-MM-DD string — machine-sortable in Excel, Google Sheets, and any CSV viewer.
• buildRankTrackingExport accepts a new optional lastCheckedAt?: string | null parameter. The formatted value is appended as the last column so all existing column indexes are unchanged (no breaking change for anyone already parsing the CSV programmatically).
• exportRankTrackingCsv and exportRankTrackingToSheets each accept and forward the new parameter.

RankTrackingDomainDetail.tsx

• Both onExport and onExportToSheets call sites now pass run?.lastCheckedAt — the value already present on resultsData.run — so the column is populated automatically on every export.

Acceptance criteria checklist

• Full-table and selected-row CSV exports include Last checked at
• Sheets exports include the same field and value
• Format is YYYY-MM-DD — consistent and sortable in common spreadsheet tools
• Existing export columns and filtered-row behaviour remain unchanged
• Graceful empty string when run is null (no data yet)

Testing

Manual verification path (no new unit tests needed for a single helper):

1. Open a Rank Tracking domain with at least one completed check
2. Click Export CSV — open the file and confirm the last column is Last checked at with a YYYY-MM-DD value
3. Click Export to Sheets — confirm the same column appears in the sheet
4. Repeat with filters applied (selected-row export) and verify the column is still present
5. On a domain with no completed checks, confirm the column header appears but the value is blank

Notes

• formatCheckedAt wraps new Date(...).toISOString() in a try/catch to guard against malformed timestamps — returns "" on failure.
• No schema changes, no server changes, no new dependencies.

Greptile Summary

This PR adds a Last checked at column to Rank Tracking CSV and Google Sheets exports by threading run?.lastCheckedAt through buildRankTrackingExport. The full-table export paths in RankTrackingDomainDetail are correctly updated, but the selected-row export paths inside RankTrackingTable are not — buildRankTrackingExport is called there without lastCheckedAt, so those exports will always emit a blank column.

• RankTrackingTableParts.tsx — adds lastCheckedAt parameter and a formatCheckedAt helper to buildRankTrackingExport, exportRankTrackingCsv, and exportRankTrackingToSheets.
• RankTrackingDomainDetail.tsx — passes run?.lastCheckedAt to the two full-table export call sites; does not update the <RankTrackingTable /> props, leaving selected-row exports with an empty Last checked at value.

Confidence Score: 3/5

Full-table exports work, but selected-row exports in RankTrackingTable.tsx always emit a blank Last checked at column because the PR did not update that component.

The selected-row export paths in RankTrackingTable.tsx call buildRankTrackingExport without lastCheckedAt, so the new column header appears but every value is empty — the PR's own acceptance criterion for selected-row exports is unmet.

RankTrackingTable.tsx needs a lastCheckedAt prop and both buildRankTrackingExport call sites updated; RankTrackingDomainDetail.tsx needs to pass run?.lastCheckedAt to

Important Files Changed

Filename	Overview
src/client/features/rank-tracking/RankTrackingTableParts.tsx	Adds lastCheckedAt param to buildRankTrackingExport, exportRankTrackingCsv, and exportRankTrackingToSheets; introduces a formatCheckedAt helper that could be simplified to a direct slice since the stored value is already ISO-8601.
src/client/features/rank-tracking/RankTrackingDomainDetail.tsx	Passes run?.lastCheckedAt to the full-table CSV and Sheets export calls; does not pass it to <RankTrackingTable />, so selected-row exports remain broken.

Sequence Diagram

%%{init: {'theme': 'neutral'}}%%
sequenceDiagram
    participant DD as RankTrackingDomainDetail
    participant RT as RankTrackingTable
    participant TP as RankTrackingTableParts

    Note over DD: Full-table export
    DD->>TP: exportRankTrackingCsv(filtered, ..., run?.lastCheckedAt)
    TP->>TP: buildRankTrackingExport(..., lastCheckedAt)
    TP-->>DD: CSV with Last checked at populated

    Note over RT: Selected-row export
    RT->>TP: buildRankTrackingExport(selectedRankRows, showDesktop, showMobile)
    Note right of TP: lastCheckedAt = undefined, value is always empty
    TP-->>RT: Export with Last checked at header but blank values

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sequenceDiagram
    participant DD as RankTrackingDomainDetail
    participant RT as RankTrackingTable
    participant TP as RankTrackingTableParts

    Note over DD: Full-table export
    DD->>TP: exportRankTrackingCsv(filtered, ..., run?.lastCheckedAt)
    TP->>TP: buildRankTrackingExport(..., lastCheckedAt)
    TP-->>DD: CSV with Last checked at populated

    Note over RT: Selected-row export
    RT->>TP: buildRankTrackingExport(selectedRankRows, showDesktop, showMobile)
    Note right of TP: lastCheckedAt = undefined, value is always empty
    TP-->>RT: Export with Last checked at header but blank values

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