Redesign the setup flow and consolidate the CSS into one primitives layer

Onboarding asks explicitly for one or two parents and shows one card per
parent for balances; the balance form is per parent with inline
validation; the partner can be filled from the FK deduction or added
from it. Settings and Dashboard reuse the same form.

CSS: bare buttons carry no colour any more; buttons, cards, choice
cards, fields, alerts, badges, eyebrow and modal chrome are defined once
in primitives.css. Media queries live only in responsive.css. A style
guard test blocks hex, !important and stray media queries. Bilingual
fixes: calendar selects size by content, header no longer wraps. Vitest
is capped at four workers.

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>

frontend/src/hooks/useAnalytics.ts

@@ -1,6 +1,7 @@
 import { useState, useEffect, useCallback } from 'react'
 import * as api from '@/services/api'
 import { useLatestRequest } from './useLatestRequest'
+import { useWorkspace } from '@/context'
 import type { WorkspaceOverview } from '@/types'
 
 interface UseAnalyticsResult {
@@ -15,6 +16,7 @@ export function useAnalytics(workspaceId: string | null, childId?: string): UseA
   const [isLoading, setIsLoading] = useState(false)
   const [error, setError] = useState<string | null>(null)
   const { start, isCurrent } = useLatestRequest()
+  const { planVersion } = useWorkspace()
 
   const fetch = useCallback(async () => {
     const requestId = start()
@@ -43,9 +45,14 @@ export function useAnalytics(workspaceId: string | null, childId?: string): UseA
     }
   }, [workspaceId, childId, start, isCurrent])
 
+  // `planVersion` (bumped by usePlannedDays/useDayOverrides mutations) is
+  // included so a plan edit made through a different hook instance — e.g.
+  // the Calendar's `usePlannedDays` — refreshes the at-risk figures here
+  // too, without this hook knowing anything about who mutated. See
+  // `WorkspaceContext.planVersion`.
   useEffect(() => {
     fetch()
-  }, [fetch])
+  }, [fetch, planVersion])
 
   return { data, isLoading, error, refresh: fetch }
 }