feat(apps): a sales expert can work inside their customer's account (D29)

Reported missing by the owner: in the reference an expert could open any
of their referred customers and use the app AS them — browse, see
balance and debt, place orders — «یکجورایی انگار با اکانت اون ها لاگین
کرده». D21 had deliberately left it out as a session-hijack primitive.
The owner asked for the capability back with the implementation left to
judgement, so the scope is the reference's and the mechanism is not.

Scope: everything, as the reference had it. Its axios interceptor
swapped the bearer token, so every request went as the customer,
document upload included. No route is closed in act-as mode.

Mechanism: the reference minted and handed over the customer's own
permanent api_token. Here the expert keeps their own token and sends
X-Act-As-Customer, resolved in one place — CustomerJwtStrategy
.validateExpert. That single point is why all 17 customer routes work
unchanged: validate() already returns a principal whose `id` is a
Customer id and every customer route reads it. It also fixes four real
defects of the original:

  - ownership is re-checked on EVERY request, with referredByAgentId in
    the same where clause as the id, so another expert's customer and a
    non-existent id both answer 403, and a customer moved to another
    expert loses access at once rather than at token expiry;
  - nothing durable is handed out — the reference's token sat in
    localStorage with no expiry and kept working after the expert left;
  - adminUserId survives, so an order placed this way is attributable;
    in the reference the request was literally the customer's;
  - 403 rather than 401, so the app clears the act-as state instead of
    logging a perfectly valid session out.

Performance: one findFirst on the primary key, only when the header is
present, and it replaces the trading-account lookup rather than adding
to it.

Three things the reference never needed, because it swapped the whole
session. queryCache's `me:` keys, favouritesStore and wageQuoteStore all
dropped their data on a TOKEN change, which act-as does not cause — so
an expert would have seen their own profile, orders, balance, ledger and
favourites inside the customer's account. The wage-quote one is the
money case: making charge is per customer, so the figure on screen would
not have been the one the order was priced at. And uploadDocument builds
its own headers, so an expert's upload would have been filed against
their own account, silently.

Added with no reference equivalent: a permanent «در حال مشاهده به‌عنوان
…» bar. There, impersonation was invisible once the token had been
swapped, and placing an order on the wrong customer's gold debt was one
tap away. It is also the exit — the reference's only way out was a
logout that ended the expert's own session too. The cart is cleared in
both directions.

CustomerJwtStrategy had no test coverage at all and is now where this
feature's whole authorisation boundary lives: act-as-customer.spec.ts
covers 11 cases, including the header being ignored on a customer token,
the no-header path asserting the extra query does not run, and a revoked
session short-circuiting before the header is read.

api: 308/308 tests, 28 suites; both apps vue-tsc clean.

اپ: کارشناس فروش می‌تواند وارد حساب مشتریان خود شود، وضعیتشان را ببیند و از طرفشان سفارش ثبت کند.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

docs/parity/ISSUES.md

@@ -243,3 +243,25 @@ response for every unregistered number. `request-otp.spec.ts` now covers 9 cases
 — the happy path, the unknown number, Persian-digit input, a refused gateway, the
 dev no-gateway fallback, that the fallback does **not** apply in production, and
 the two sales-expert states.
+
+## Sales expert — «ورود به حساب مشتری» restored (2026-10-12)
+
+Reported by the owner: «کارشناس فروش میتونه از طریق اپ خودش وارد صفحه مشتری هاش
+بشه و از جانب اون ها ثبت سفارش کنه … انگار با اکانت اون ها لاگین کرده … و این
+خیلی کاربردی بود ولی الان نیست».
+
+| ID | Severity | Where | Description | Evidence | Status |
+|---|---|---|---|---|---|
+| **EXP-01** | High (missing capability) | REF `henza_pwa` `customerChoice.vue:155-167` → `myDataStore.ts:159-169` → `tokenManage.ts:8` → `plugins/axios.ts:18`; REF server `ApiMobileController.php:197-201`. TGT both apps + `customer-jwt.strategy.ts` | A sales expert could open any of their referred customers' accounts and use the whole app as them — browse, see balance and debt, place orders. The reference did it by **minting and handing over the customer's own permanent `api_token`**, which its axios interceptor then used for every request. The target listed the customers but tapping one only opened a detail sheet; an expert's order always landed on their own trading account. | Read all five reference files and the target's view header, which recorded the omission (D21). | ✅ **RESTORED 2026-10-12 (D29)** with the reference's full scope — every customer route, including documents — but a different mechanism: `X-Act-As-Customer` alongside the expert's **own** token, resolved once in `CustomerJwtStrategy.validateExpert`, which is why all 17 customer routes work unchanged. Ownership (`referredByAgentId`) is re-checked **on every request** in the same query as the id, so another expert's customer and a non-existent id both answer 403. 11 tests. |
+| **EXP-02** | Medium (found while building EXP-01) | TGT both apps `stores/queryCache.ts`, `favoritesStore.ts`, `wageQuoteStore.ts` | All three drop their per-customer data when `session.token` changes — but act-as changes **whose** data they hold *without* changing the token. An expert entering a customer's account would have seen their own profile, orders, balance, ledger, favourites and **making-charge quotes**. | Read each watcher; each one's own comment stated the rule it was about to break. | ✅ Fixed with EXP-01: each watcher now also keys on `actingAs.id`. The wage-quote one is the money case — making charge is per customer, so a stale quote would have shown a figure that was not the one the order was priced at. |
+| **EXP-03** | Medium (same) | TGT both apps `api/client.ts` `uploadDocument` | The multipart upload bypasses `request()` and builds its own headers, so the act-as header had to be repeated there. Without it an expert uploading a customer's documents would have filed them against their **own** account, silently and with no error. | `grep Authorization` on the client returns two call sites, not one. | ✅ Both call sites send the header. |
+
+**Deliberately different from the reference** (all in D29): no customer token is
+ever minted; the act-as target lives in `sessionStorage`, so closing the tab ends
+it, where the reference's `api_token` sat in `localStorage` forever and outlived
+the expert's employment; `adminUserId` survives the switch so an order placed
+this way is attributable (the reference's requests were indistinguishable from
+the customer's own); a permanent «در حال مشاهده به‌عنوان …» bar with an exit
+button, which the reference had no equivalent of — there, impersonation was
+invisible and the only way out was a logout that also ended the expert's own
+session; and the cart is cleared in both directions.