printedparts: show revision at kiosk; low-stock email uses gage tag + item link

Kiosk now displays the scanned revision (badge, quantity, and done screens) so
the operator sees which revision they checked out - it was already recorded on
the take, just not shown. Low-stock email now uses the gage lab tag (was the
internal item code) and links to the item page when site_base_url is set (new
core setting, category email; emails have no request context to derive the URL).

plugins/printedparts/api/routes.py

@@ -330,13 +330,20 @@ def _send_lowstock_alert(item):
     Recipients: Setting printedparts_alert_email (comma-separated), falling
     back to the site's alert_recipients. Never fails the transaction - the
     ledger write already committed."""
-    from shopdb.api import send_email, send_alert
-    subject = (f'Low stock: {item.itemname} ({item.itemcode}) - '
+    from shopdb.api import send_email, send_alert, Setting
+    code = item.gagelabtag or item.itemcode
+    subject = (f'Low stock: {item.itemname} ({code}) - '
                f'{item.quantityonhand} left')
-    html = (f'<p><strong>{item.itemname}</strong> ({item.itemcode}) is down '
+    # Absolute link to the item page when the site base URL is configured
+    # (e.g. https://<host>/ops). Emails have no request context to derive it.
+    base = (Setting.get('site_base_url') or '').rstrip('/')
+    link_html = (f'<p><a href="{base}/printedparts/{item.printeditemid}">'
+                 f'View {code}</a></p>') if base else ''
+    html = (f'<p><strong>{item.itemname}</strong> ({code}) is down '
             f'to <strong>{item.quantityonhand}</strong> '
             f'(threshold {item.lowstockthreshold}).</p>'
             f'<p>Bin: {item.binlocation or "-"}</p>'
+            f'{link_html}'
             f'<p>Time to print more.</p>')
     try:
         recipients = _alert_recipients()

plugins/printedparts/frontend/views/PartsKiosk.vue

@@ -40,6 +40,7 @@
         <div>
           <h2>{{ item.itemname }}</h2>
           <p class="kiosk-hint">{{ item.gagelabtag || item.itemcode }} - {{ item.quantityonhand }} on hand</p>
+          <p v-if="scannedRevision != null" class="kiosk-rev">Revision {{ scannedRevision }}</p>
         </div>
       </div>
       <p class="kiosk-prompt">Scan your badge or tap in your SSO</p>
@@ -62,6 +63,7 @@
         <div>
           <h2>{{ item.itemname }}</h2>
           <p class="kiosk-hint">{{ item.quantityonhand }} on hand</p>
+          <p v-if="scannedRevision != null" class="kiosk-rev">Revision {{ scannedRevision }}</p>
         </div>
       </div>
       <p class="kiosk-prompt">How many are you taking?</p>
@@ -82,6 +84,7 @@
     <!-- done -->
     <section v-else-if="step === 'done'" class="kiosk-step">
       <p class="kiosk-success">Done - {{ doneMessage }}</p>
+      <p v-if="scannedRevision != null" class="kiosk-hint">Checked out revision {{ scannedRevision }}</p>
       <p class="kiosk-hint">Starting over in a few seconds...</p>
     </section>
   </div>
@@ -222,6 +225,7 @@ function reset() {
 }
 .kiosk-prompt { font-size: 1.6rem; font-weight: 600; }
 .kiosk-hint { color: var(--text-light); }
+.kiosk-rev { font-size: 1.3rem; font-weight: 700; color: var(--primary); margin-top: 0.25rem; }
 .kiosk-error {
   background: var(--danger);
   color: #fff;

shopdb/core/api/settings.py

@@ -830,6 +830,14 @@ def build_default_settings():
             'category': 'email',
             'description': 'Default email recipients for alerts (comma-separated)'
         },
+        {
+            'key': 'site_base_url',
+            'value': '',
+            'valuetype': 'string',
+            'category': 'email',
+            'description': 'Public base URL of this site (e.g. '
+                           'https://host/ops), used to build links in emails'
+        },
         # Audit log settings
         {
             'key': 'audit_retention_days',