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/models/raw_material.py

@@ -2,7 +2,7 @@ from __future__ import annotations
 
 from datetime import date, datetime
 
-from sqlalchemy import Date, DateTime, Float, ForeignKey, String, Text
+from sqlalchemy import Date, DateTime, Float, ForeignKey, Integer, String, Text
 from sqlalchemy.orm import Mapped, mapped_column, relationship
 
 from app.db.session import Base
@@ -18,6 +18,9 @@ class RawMaterial(Base):
     unit_of_measure: Mapped[str] = mapped_column(String(64))
     kg_per_unit: Mapped[float] = mapped_column(Float)
     status: Mapped[str] = mapped_column(String(32), default="active")
+    # Decimal places this ingredient's required-kg is rounded to in the mix
+    # calculator output. Set per-ingredient from the Ingredients Editor.
+    rounding_decimals: Mapped[int] = mapped_column(Integer, default=2)
     notes: Mapped[str | None] = mapped_column(Text, nullable=True)
     created_at: Mapped[datetime] = mapped_column(DateTime, default=datetime.utcnow)