feat: remove F-skatt warning card from dashboard

Remove FSkattWarningCard component, related tax warning functions,
types, and thresholds. Feature was not providing enough value.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

types/index.ts

@@ -1009,9 +1009,6 @@ export interface CreateFiscalPeriodInput {
   period_end: string
 }
 
-// Tax warning levels
-export type TaxWarningLevel = 'safe' | 'info' | 'warning' | 'danger'
-
 // Onboarding progress for new user checklist
 export interface OnboardingProgress {
   hasCustomers: boolean
@@ -1020,19 +1017,6 @@ export interface OnboardingProgress {
   hasBankConnected: boolean
 }
 
-// Enhanced tax warning status
-export interface TaxWarningStatus {
-  level: TaxWarningLevel
-  message: string
-  percentageDifference: number
-  yearEndProjection?: {
-    estimatedTotalTax: number
-    projectedPreliminaryPayments: number
-    projectedDifference: number
-  }
-  recommendation?: string
-}
-
 // Onboarding step data
 export interface OnboardingStepData {
   step1?: {