Tech cards: remove photo without replacement, header spacing, order link

- New "Видалити фото (без заміни)" checkbox on the tech card form —
  previously the only way to clear a plating photo was uploading a
  replacement.
- Fixed missing top margin between the "← До тех карт" back-link and the
  product header on the tech card form.
- Order detail page now links each item to its tech card (when the viewer
  has tech-card access) so kitchen staff can jump straight to prep
  instructions while working an order.

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

bober_bbq/admin/tech_cards.py

@@ -46,6 +46,8 @@ def tech_card_edit(product_id):
                 upload_dir.mkdir(parents=True, exist_ok=True)
                 file.save(upload_dir / secure_filename(filename))
                 card.photo_url = f"/static/uploads/{filename}"
+        elif request.form.get("remove_photo"):
+            card.photo_url = ""
 
         db.session.commit()
         log_action("tech_card_save", f"Оновлено тех карту «{product.name}»")

bober_bbq/templates/admin/order_detail.html

@@ -74,7 +74,12 @@
       <tr><th>Товар</th><th>К-сть</th><th>Ціна</th><th>Сума</th></tr>
       {% for item in order.items %}
       <tr>
-        <td>{{ item.product_name }}</td>
+        <td>
+          {{ item.product_name }}
+          {% if tech_cards_nav_visible and item.product_id %}
+          <a class="muted" style="font-size:11px;margin-left:6px;white-space:nowrap;" href="{{ url_for('admin.tech_card_edit', product_id=item.product_id) }}" title="Тех карта: інструкція та фото подачі">📋 тех карта</a>
+          {% endif %}
+        </td>
         <td>{{ item.quantity }}</td>
         <td>{{ item.product_price }} грн</td>
         <td>{{ item.line_total }} грн</td>

bober_bbq/templates/admin/tech_card_form.html

@@ -2,7 +2,7 @@
 {% block page_title %}Тех карта: {{ product.name }}{% endblock %}
 {% block content %}
 <style>
-  .tc-head { display: flex; align-items: center; gap: 14px; margin-bottom: 18px; }
+  .tc-head { display: flex; align-items: center; gap: 14px; margin-top: 18px; margin-bottom: 18px; }
   .tc-head h1 { margin: 0 0 4px; }
   .tc-preview {
     display: block;
@@ -38,6 +38,10 @@
     <label>Фото подачі <span class="muted">(як страва має виглядати на видачі)</span></label>
     {% if card and card.photo_url %}
       <img class="tc-preview" src="{{ card.photo_url }}" alt="">
+      <label style="display:flex;align-items:center;gap:8px;font-weight:400;margin-bottom:10px;">
+        <input type="checkbox" name="remove_photo" class="admin-checkbox">
+        Видалити фото (без заміни)
+      </label>
     {% endif %}
     <input type="file" name="photo" accept="image/*">
 

tests/test_tech_cards.py

@@ -5,7 +5,7 @@ pattern as suppliers (see admin/authz.py's tech_cards_access_required).
 
 from bober_bbq.config import config
 from bober_bbq.extensions import db
-from bober_bbq.models import AdminUser, Category, Product, Setting, TechCard
+from bober_bbq.models import AdminUser, Category, Order, OrderItem, Product, Setting, TechCard
 
 
 def _make_category(app):
@@ -97,6 +97,44 @@ def test_tech_card_create_then_edit_roundtrip(app):
     assert "Видалити тех карту" in body
 
 
+def test_tech_card_remove_photo_without_replacement(app):
+    product_id = _make_product(app)
+    with app.app_context():
+        db.session.add(TechCard(product_id=product_id, photo_url="/static/uploads/old.jpg"))
+        db.session.commit()
+
+    client = app.test_client()
+    _admin_login(client, app)
+    resp = client.post(
+        f"/admin/tech-cards/{product_id}",
+        data={"instructions": "", "remove_photo": "1"},
+        follow_redirects=True,
+    )
+    assert resp.status_code == 200
+
+    with app.app_context():
+        card = TechCard.query.filter_by(product_id=product_id).one()
+        assert card.photo_url == ""
+
+
+def test_order_detail_links_to_tech_card(app):
+    product_id = _make_product(app)
+    with app.app_context():
+        product = Product.query.get(product_id)
+        order = Order(user_id=-1, order_type="pickup", customer_name="Гість", payment_method="cash", pickup_time="19:00")
+        db.session.add(order)
+        db.session.commit()
+        db.session.add(OrderItem(order_id=order.id, product_id=product_id, product_name=product.name, product_price=150, quantity=1))
+        db.session.commit()
+        order_id = order.id
+
+    client = app.test_client()
+    _admin_login(client, app)
+    resp = client.get(f"/admin/orders/{order_id}")
+    assert resp.status_code == 200
+    assert f"/admin/tech-cards/{product_id}" in resp.get_data(as_text=True)
+
+
 def test_tech_card_delete_removes_row(app):
     product_id = _make_product(app)
     with app.app_context():