feat(task-board): re-run a whole selection, not one card at a time

[pedrofrxncx]

#5768 gave every Super-Agent card a Re-run, but only one at a time. The board
that needs it (demo-storefront: 63 items, all delegated, 46 parked) is exactly
the one where clicking 46 cards is not a recovery path.

Re-run now sits in the selection bar next to Auto-fix, gated on the same
predicate as the card button — delegated to the Super Agent and not Done —
required of every selected card, so the action never silently skips part of a
selection. RerunDialog takes a list instead of one item (one card passes a
single-element array), with plural copy and the takeover warning stated
unconditionally for a selection, since the board cannot tell a streaming run
from a wedged one for any of them.

Confirm fires TASK_BOARD_ITEM_RERUN per id, the same fire-and-forget shape as
the bar's other bulk actions, and clears the selection. No bulk tool variant:
one error surfaces (paywall/quota) rather than one per item — worth revisiting
if N grows.

Testing

• bun run --cwd=apps/web check clean
• bun test apps/web/src/layouts/task-board/ — 48 pass (the 4 failures are an untracked local ci-fix/ copy dir, unrelated)
• bun run fmt, bun run lint — 0 errors

Existing hasUnfinishedRun unit test still covers the takeover predicate; the bulk gate is the same expression as the card's showRerun.

Follow-ups

• A bulk TASK_BOARD_ITEM_RERUN variant + per-item error surfacing, if N gets large enough that N round-trips or a swallowed mid-batch quota error bites.

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Summary by cubic

Add bulk Re-run to the task board so you can re-run a whole selection of Super Agent tasks at once. This speeds up recovery on large boards and avoids clicking each card.

• New Features
  • Added Re-run to the selection bar next to Auto-fix. Shown only when all selected cards are delegated to the Super Agent and not Done, so nothing is skipped.
  • Updated RerunDialog to accept multiple items with plural copy; for multi-select, it warns that any open runs will be stopped.
  • Confirm triggers TASK_BOARD_ITEM_RERUN for each selected id and then clears the selection; errors surface once, consistent with other bulk actions.

^{Written for commit 4294a76. Summary will update on new commits.}