v0.1.30 - Throughput overview today-only mix cards; mix formula save 500 fix

Throughput Overview: Horse Mix and Grain Mix are now the first two cards and
show TODAY's output only. Removed the 7d/4w/6w/12w range selector; the cards
are fixed to Horse mix today, Grain mix today, Today, This week, 4-week average.

Mix Editor formula save: fix HTTP 500 on PUT /editor/mixes/{id}/formula. The
audit-diff path read the resolved formula by attribute, but the resolver returns
dicts -> AttributeError. Read by key and expire stale ORM state so the response
reflects the just-saved rows. Adds regression tests for both save branches.

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

frontend/src/lib/components/throughput/utils.ts

@@ -15,13 +15,6 @@ export type ConfettiPiece = {
 
 export const CONFETTI_COLORS = ['#16a34a', '#f59e0b', '#3b82f6', '#ec4899', '#8b5cf6', '#ef4444'];
 
-export const MIX_RANGES = [
-  { key: '7d', label: '7 days', sub: 'last 7 days', days: 7 },
-  { key: '4w', label: '4 weeks', sub: 'last 4 weeks', days: 28 },
-  { key: '6w', label: '6 weeks', sub: 'last 6 weeks', days: 42 },
-  { key: '12w', label: '12 weeks', sub: 'last 12 weeks', days: 84 }
-] as const;
-
 export function compareText(a: string | null | undefined, b: string | null | undefined) {
   return (a ?? '').localeCompare(b ?? '', undefined, { sensitivity: 'base' });
 }