Product delete (#64)

* feat: restore stalls from `nostr` as pending

* feat: stall and prod last update time

* feat: restore products and stalls as `pending`

* feat: show pending stalls

* feat: restore stall

* feat: restore a stall from nostr

* feat: add  blank `Restore Product` button

* fix: handle no talls to restore case

* feat: show restore dialog

* feat: allow query for pending products

* feat: restore products

* chore: code clean-up

* fix: last dm and last order query

* chore: code clean-up

* fix: subscribe for stalls and products on merchant create/restore

* feat: add message type to orders

* feat: simplify messages; code format

* feat: add type to DMs; restore DMs from nostr

* fix: parsing ints

* fix: hide copy button if invoice not present

* fix: do not generate invoice if product not found

* feat: order restore: first version

* refactor: move some logic into `services`

* feat: improve restore UX

* fix: too many calls to customer DMs

* fix: allow `All` customers filter

* fix: ws reconnect on server restart

* fix: query for customer profiles only one

* fix: unread messages per customer per merchant

* fix: disable `user-profile-events`

* fix: customer profile is optional

* fix: get customers after new message debounced

* chore: code clean-up

* feat: auto-create zone

* feat: fixed ID for default zone

* feat: notify order paid

static/components/customer-stall/customer-stall.html

@@ -110,7 +110,8 @@
         </q-inner-loading>
       </div>
       <div class="row q-mt-lg">
-        <q-btn outline color="grey" @click="copyText(qrCodeDialog.data.payment_request)">Copy invoice</q-btn>
+        <q-btn v-if="qrCodeDialog.data.payment_request" outline color="grey"
+          @click="copyText(qrCodeDialog.data.payment_request)">Copy invoice</q-btn>
         <q-btn @click="closeQrCodeDialog" flat color="grey" class="q-ml-auto">Close</q-btn>
       </div>
     </q-card>