## Summary
Pairs with
[copenhagentruckwash/api#371](https://github.com/copenhagentruckwash/api/pull/371)
to render category indicator chips (e.g. *Faktura pr. ordre*,
*Fastpris*, *Tankrengøring*) on every Superuser → Fakturaer → Periode
subpage, including the *Alle* tab.
## What changed
* `InvoicingBillingPeriodCustomerAttributes.vue` pre-computes a
`Set<customer_number>` per view bucket so membership lookups are O(1)
regardless of bucket size. The component already iterated
`sharedVariables.types`; this PR just hoists the membership check out of
the per-chip `Array.some()` into a precomputed Set index.
* Skips entries that don't carry a positive integer `customer_number` so
non-numeric or null payloads from legacy clients stay inert.
* Honours the deterministic `ATTRIBUTE_DISPLAY_PRIORITY` ordering across
the chips.
## Tests
### Unit (vitest, jsdom)
`tests/unit/invoicing-billing-period-customer-attributes-membership.spec.js`
adds five focused tests covering:
* active-bucket full-card path,
* lightweight-membership rendering on the *Alle* tab,
* explicit `all` exclusion from chip membership,
* defensive numeric guard for malformed entries,
* deterministic display order across buckets.
### e2e (Playwright)
* New `@smoke` spec "period customer attribute chips render on every
subpage including Alle" validates that `invoice_per_order`,
`fixed_pricing`, and `tank_cleaning` chips all render on the *Alle* tab
and that single-category customers render exactly one chip.
* Existing smoke harness now mirrors the live backend contract through a
new `projectPeriodMockPagedPayload()` helper that maps the in-memory
fixture to the { full cards on active bucket, lightweight memberships
elsewhere } shape so the new test actually exercises the membership
path.
## Plan
`docs/invoicing-period-tag-membership-plan.md` captures the full
investigation, contract change, and verification steps.
🤖 Generated by [OpenHands](https://docs.openhands.dev/) on behalf of
copenhagentruckwash.
---------
Co-authored-by: openhands <openhands@all-hands.dev>
