feat: UI polish, lint fixes, onboarding redesign, help page expansion, and test improvements

Broad update across dashboard pages, components, extensions, and lib code. Includes ESLint config additions, onboarding flow redesign, settings page refactor, help page content expansion, dead code removal, and test mock fixes. Adds dev docs and public assets.

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

lib/bookkeeping/account-descriptions.ts

@@ -1,3 +1,5 @@
+import { getBASReference, ACCOUNT_CLASS_LABELS } from './bas-reference'
+
 export type AccountType = 'asset' | 'liability' | 'equity' | 'revenue' | 'expense' | 'untaxed_reserves'
 
 export interface AccountDescription {
@@ -332,8 +334,6 @@ export function getAccountDescription(accountNumber: string): AccountDescription
 
   // Fall back to BAS reference data for accounts not in the hardcoded list
   try {
-    // Dynamic import avoided — use lazy require pattern
-    const { getBASReference, ACCOUNT_CLASS_LABELS } = require('./bas-reference')
     const ref = getBASReference(accountNumber)
     if (ref) {
       const classLabel = ACCOUNT_CLASS_LABELS[ref.account_class] || ''

lib/bookkeeping/currency-revaluation.ts

@@ -173,10 +173,8 @@ export async function previewCurrencyRevaluation(
   let credit1510 = 0 // Receivable loss (revalue down)
   let debit2440 = 0 // Payable gain (liability shrank)
   let credit2440 = 0 // Payable loss (liability grew)
-  let debit3960 = 0 // Placeholder — we won't debit 3960
   let credit3960 = 0 // Gains
   let debit7960 = 0 // Losses
-  let credit7960 = 0 // Placeholder — we won't credit 7960
 
   for (const item of items) {
     if (item.type === 'receivable') {

lib/bookkeeping/invoice-entries.ts

@@ -1,6 +1,6 @@
 import { createJournalEntry, findFiscalPeriod } from './engine'
 import { resolveSekAmount, buildCurrencyMetadata } from './currency-utils'
-import { generateSalesVatLines, generateReverseChargeLines } from './vat-entries'
+import { generateSalesVatLines } from './vat-entries'
 import { getVatTreatmentForRate } from '@/lib/invoices/vat-rules'
 import { createLogger } from '@/lib/logger'
 import type { SupabaseClient } from '@supabase/supabase-js'

lib/bookkeeping/mapping-engine.ts

@@ -2,14 +2,11 @@ import type { SupabaseClient } from '@supabase/supabase-js'
 import {
   generateInputVatLine,
   generateReverseChargeLines,
-  extractNetAmount,
-  extractVatAmount,
 } from './vat-entries'
 import { findMatchingTemplates, buildMappingResultFromTemplate } from './booking-templates'
 import type {
   MappingRule,
   MappingResult,
-  RiskLevel,
   Transaction,
   EntityType,
   VatJournalLine,

lib/bookkeeping/transaction-entries.ts

@@ -1,6 +1,6 @@
 import { createJournalEntry, findFiscalPeriod } from './engine'
 import { resolveSekAmount, buildCurrencyMetadata } from './currency-utils'
-import { generateInputVatLine, generateReverseChargeLines, extractNetAmount, extractVatAmount } from './vat-entries'
+import { extractNetAmount, extractVatAmount } from './vat-entries'
 import { createLogger } from '@/lib/logger'
 import type { SupabaseClient } from '@supabase/supabase-js'
 import type {