v0.1.19 - Throughput overview & responsive header

- Throughput: new "Throughput Overview" header with Gauge icon and brand-green
  badge icons on each card (Today, This week, 4-week average, Horse Mix, Grain Mix)
- Throughput: inline rolling-range selector (7d / 4w / 6w / 12w, default 4 weeks)
  driving the customer-mix cards; stats window widened to 12 weeks so switching
  range is a pure client-side re-filter
- Throughput: cards collapse to a single even 5-across row on laptop and up,
  with container-query value text that scales to each card's width
- Throughput: date logic pinned to Australian Eastern time (fixes the day-early
  date); This week subtitle shows the Mon-Sun date range
- Throughput: subtler tinted add-form; removed the inline-entry kicker and the
  "Open full form" link
- Topbar: fix cramped laptop header - action toggles no longer wrap above the
  user button; search drops to its own row earlier

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

backend/app/services/mix_calculator_service.py

@@ -43,6 +43,7 @@ def _resolved_formula_rows(product: Product) -> tuple[list[dict], float]:
                 "raw_material_name": ingredient.raw_material.name,
                 "quantity_kg": ingredient.quantity_kg,
                 "unit": ingredient.raw_material.unit_of_measure,
+                "rounding_decimals": ingredient.raw_material.rounding_decimals,
                 "sort_order": ingredient.sort_order,
             }
             for ingredient in product.ingredients
@@ -55,6 +56,7 @@ def _resolved_formula_rows(product: Product) -> tuple[list[dict], float]:
                 "raw_material_name": ingredient.raw_material.name if ingredient.raw_material is not None else f"Raw material {ingredient.raw_material_id}",
                 "quantity_kg": ingredient.quantity_kg,
                 "unit": ingredient.raw_material.unit_of_measure if ingredient.raw_material is not None else "kg",
+                "rounding_decimals": ingredient.raw_material.rounding_decimals if ingredient.raw_material is not None else 2,
                 "sort_order": index,
             }
             for index, ingredient in enumerate(product.mix.ingredients, start=1)
@@ -128,6 +130,7 @@ def calculate_mix_calculator_preview(
                 "required_kg": required_kg,
                 "mix_percentage": mix_percentage,
                 "unit": ingredient["unit"],
+                "rounding_decimals": ingredient.get("rounding_decimals", 2),
                 "sort_order": ingredient["sort_order"] or index,
             }
         )
@@ -260,6 +263,7 @@ def serialize_mix_calculator_session(session_record: MixCalculatorSession, auth_
                 "required_kg": round(line.required_kg, 4),
                 "mix_percentage": round(line.mix_percentage, 4),
                 "unit": line.unit,
+                "rounding_decimals": line.rounding_decimals,
                 "sort_order": line.sort_order,
             }
             for line in session_record.lines
@@ -331,6 +335,7 @@ def create_mix_calculator_session(db: Session, *, auth_session: AuthSession, pay
             required_kg=line["required_kg"],
             mix_percentage=line["mix_percentage"],
             unit=line["unit"],
+            rounding_decimals=line.get("rounding_decimals", 2),
             sort_order=line["sort_order"],
         )
         for line in preview["lines"]