printedparts stage 16: kiosk touch fixes from first hands-on use

The tap-anywhere wedge refocus stole focus from the manual-entry field
the moment it was tapped - the handler now only reclaims focus from
dead space, never from a real control. Manual entry works without a
physical keyboard: badge entry uses the TouchKeypad (an SSO is
digits), and item lookup accepts bare digits resolved by row id - the
digits in a minted code are the id, which also keeps labels printed
under an older prefix scannable after the prefix changes.

plugins/printedparts/api/routes.py

@@ -381,12 +381,28 @@ def adjust_item(item_id: int):
 # physically rate-limited. It can reduce stock of an active item and nothing
 # else; identity comes from the badge resolved server-side, never the client.
 
+def _kiosk_find_item(itemcode):
+    """Resolve a scanned or typed code to an active item.
+
+    Accepts the full code (WJRP0042) or bare digits from the touch keypad
+    (42 -> prefix + zero-pad), so manual entry never needs letters."""
+    itemcode = (itemcode or '').strip()
+    item = PrintedItem.query.filter(
+        PrintedItem.itemcode == itemcode,
+        PrintedItem.isactive == True).first()
+    if not item and itemcode.isdigit():
+        # The digits in a minted code ARE the row id, so id lookup keeps
+        # working even for labels printed under an older prefix.
+        candidate = db.session.get(PrintedItem, int(itemcode))
+        if candidate and candidate.isactive:
+            item = candidate
+    return item
+
+
 @printedparts_bp.route('/kiosk/item/<itemcode>', methods=['GET'])
 def kiosk_item(itemcode):
     """Item summary for a scanned bin barcode (open read for the kiosk)."""
-    item = PrintedItem.query.filter(
-        PrintedItem.itemcode == itemcode.strip(),
-        PrintedItem.isactive == True).first()
+    item = _kiosk_find_item(itemcode)
     if not item:
         return error_response(ErrorCodes.NOT_FOUND,
                               'No part matches that barcode', http_code=404)
@@ -398,9 +414,7 @@ def kiosk_take():
     """Take parts from a bin. Body: {itemcode, badge, quantity}."""
     data = request.get_json() or {}
 
-    item = PrintedItem.query.filter(
-        PrintedItem.itemcode == (data.get('itemcode') or '').strip(),
-        PrintedItem.isactive == True).first()
+    item = _kiosk_find_item(data.get('itemcode'))
     if not item:
         return error_response(ErrorCodes.NOT_FOUND,
                               'No part matches that barcode', http_code=404)