bug(ui/history): Completed status chip filter excludes partially_completed rows that the chip counter includes #706

Chip-bucket count for Completed at frontend/src/history.ts:303-309 includes anything not pending/in-flight/failed/expired/cancelled (catch-all), but the chip filter at history.ts:574-580 returns s === 'completed' || !p.status which excludes partially_completed. Net effect: partially_completed rows count toward the Completed total but vanish when the chip is clicked.

QA observed (row 3.6) that "Completed" doesn't filter — likely a false positive on a test dataset where everything was already 'completed', OR the partially_completed exclusion bites in a real dataset.

Fix direction

Reproduce on a dataset with at least one non-completed row. Independent of repro: align chip bucket and filter for partially_completed — include in both (filter → s === 'completed' || s === 'partially_completed' || !p.status) or exclude from both (bucket → explicit branch).

Surfaced by QA spreadsheet row 3.6.