审批人 chips 按组标注（会签 group 归属）— #2762 P1-2 后续

[os-zhuang]

Follow-up to #2762 P1-2. The first pass (#2803) deduped the drawer's "Waiting on" approver chips — a person filling more than one slot now collapses to a single chip with a ×N count instead of N identical "Dev Admin" chips. That removed the noise, but it does not yet answer the original comprehension question for 会签 (per-group / M-of-N sign-off):

which group (finance / legal / manager …) does each pending approver represent?

Today the chip shows only the approver's display name. For a per_group request the reviewer can see group state from the P1-1 progress chips (Finance ✓ / Legal ○), but the "Waiting on" list can't say that the pending Dev Admin chip is standing in for the Legal group vs the Finance group.

Why it's not done in the P1-2 PR

The data isn't there. sys_approval_request.pending_approvers is a flat string[] of approver identities, and pending_approver_names is an id → name map. Neither carries the group each pending slot belongs to, and decision_progress.groups describes group aggregate state, not an approver→group mapping. So the console has nothing to label the chip with — hence the honest scope of #2803 (dedupe + count only).

Proposed shape (cross-repo)

Framework — objectstack-ai/objectstack (@objectstack/plugin-approvals)

• Extend the list/get enrichment so each pending approver carries its group, e.g. either:
  • pending_approver_groups?: Record<string, string> (approver id → group name), or
  • a richer pending_approvers shape { id: string; group?: string }[] (bigger, breaks the flat-string contract — the map is the lighter option).
• Only meaningful for behavior === 'per_group'; absent otherwise.

UI — objectui (ApprovalsInboxPage drawer)

• In approverChips(...), when a group is known, label the chip Dev Admin · Legal (or a small group sub-tag), keyed by (name, group) so the same person in two groups is two labeled chips rather than one ×2.
• Degrade gracefully to today's dedupe-with-count when the group data is absent (older backends).

Acceptance

• A finance∧legal 会签 request's drawer shows which group each waiting approver represents.
• Non-per_group requests are visually unchanged.
• Old backends (no group data) keep the current dedupe + ×N behavior.

Refs #2762 (P1-2), #2803 (dedupe pass that this extends).

Filed as the single follow-up left open from the #2762 sweep.