diff --git a/frontend/src/api/client.ts b/frontend/src/api/client.ts
index 2efc594..29c373a 100644
--- a/frontend/src/api/client.ts
+++ b/frontend/src/api/client.ts
@@ -33,7 +33,7 @@ export const queryClient = new QueryClient({
 });
 
 // Helper function to make GraphQL requests with error handling
-export async function fetchGraphQL<TData, TVariables extends Record<string, unknown>>(
+export async function fetchGraphQL<TData, TVariables extends Record<string, unknown> = Record<string, unknown>>(
   query: string,
   variables?: TVariables
 ): Promise<TData> {
diff --git a/frontend/src/components/layout/CompanySwitcher.tsx b/frontend/src/components/layout/CompanySwitcher.tsx
index faa6db7..86ec65e 100644
--- a/frontend/src/components/layout/CompanySwitcher.tsx
+++ b/frontend/src/components/layout/CompanySwitcher.tsx
@@ -6,6 +6,10 @@ import type { Company } from '@/types/accounting';
 
 const { Text } = Typography;
 
+interface CompanySwitcherProps {
+  compact?: boolean;
+}
+
 // Mock data - will be replaced with API call
 const mockCompanies: Company[] = [
   {
@@ -36,7 +40,7 @@ const mockCompanies: Company[] = [
   },
 ];
 
-export default function CompanySwitcher() {
+export default function CompanySwitcher({ compact = false }: CompanySwitcherProps) {
   const { activeCompany, setActiveCompany, setCompanies } = useCompanyStore();
 
   // Initialize with mock data if needed
@@ -62,7 +66,7 @@ export default function CompanySwitcher() {
       <Select
         value={activeCompany?.id}
         onChange={handleCompanyChange}
-        style={{ minWidth: 280 }}
+        style={{ minWidth: compact ? 150 : 280 }}
         optionLabelProp="label"
         popupMatchSelectWidth={false}
         options={companies.map((company) => ({
diff --git a/frontend/src/lib/formatters.ts b/frontend/src/lib/formatters.ts
index 3be1bf2..f365087 100644
--- a/frontend/src/lib/formatters.ts
+++ b/frontend/src/lib/formatters.ts
@@ -200,3 +200,19 @@ export function decodeHtmlEntities(text: string): string {
   textarea.innerHTML = text;
   return textarea.value;
 }
+
+/**
+ * Format a datetime in ISO format for API requests
+ */
+export function formatDateTimeISO(date: string | Date): string {
+  return dayjs(date).toISOString();
+}
+
+/**
+ * Parse an ISO date string to dayjs object
+ * Returns null if the input is null/undefined/empty
+ */
+export function parseISODate(date: string | null | undefined): import('dayjs').Dayjs | null {
+  if (!date) return null;
+  return dayjs(date);
+}
diff --git a/frontend/src/lib/periods.ts b/frontend/src/lib/periods.ts
index 65bfc88..1853d2c 100644
--- a/frontend/src/lib/periods.ts
+++ b/frontend/src/lib/periods.ts
@@ -156,7 +156,7 @@ export function generateVATPeriods(
  */
 export function getPeriodDisplayName(
   startDate: string,
-  endDate: string,
+  _endDate: string,
   frequency: PeriodFrequency
 ): { name: string; shortName: string } {
   const start = dayjs(startDate);
diff --git a/frontend/src/stores/uiStore.ts b/frontend/src/stores/uiStore.ts
index 6317cf8..fe4be6d 100644
--- a/frontend/src/stores/uiStore.ts
+++ b/frontend/src/stores/uiStore.ts
@@ -5,6 +5,9 @@ interface UIState {
   // Sidebar
   sidebarCollapsed: boolean;
 
+  // Mobile drawer
+  mobileDrawerOpen: boolean;
+
   // Theme
   darkMode: boolean;
 
@@ -14,6 +17,8 @@ interface UIState {
   // Actions
   toggleSidebar: () => void;
   setSidebarCollapsed: (collapsed: boolean) => void;
+  toggleMobileDrawer: () => void;
+  setMobileDrawerOpen: (open: boolean) => void;
   toggleDarkMode: () => void;
   addNotification: (notification: Omit<Notification, 'id'>) => void;
   removeNotification: (id: string) => void;
@@ -32,6 +37,7 @@ export const useUIStore = create<UIState>()(
   persist(
     (set) => ({
       sidebarCollapsed: false,
+      mobileDrawerOpen: false,
       darkMode: false,
       notifications: [],
 
@@ -41,6 +47,12 @@ export const useUIStore = create<UIState>()(
       setSidebarCollapsed: (collapsed) =>
         set({ sidebarCollapsed: collapsed }),
 
+      toggleMobileDrawer: () =>
+        set((state) => ({ mobileDrawerOpen: !state.mobileDrawerOpen })),
+
+      setMobileDrawerOpen: (open) =>
+        set({ mobileDrawerOpen: open }),
+
       toggleDarkMode: () =>
         set((state) => ({ darkMode: !state.darkMode })),
 
diff --git a/frontend/src/types/accounting.ts b/frontend/src/types/accounting.ts
index 2f4fb3f..fe42c45 100644
--- a/frontend/src/types/accounting.ts
+++ b/frontend/src/types/accounting.ts
@@ -209,3 +209,65 @@ export interface UserCompanyAccess {
 export interface CompanyWithRole extends Company {
   role: CompanyRole;
 }
+
+// Journal Entry Draft types
+export type JournalEntryDraftStatus = 'draft' | 'pending_review' | 'approved' | 'posted' | 'discarded';
+
+export interface JournalEntryDraftLine {
+  lineNumber: number;
+  accountId: string;
+  debitAmount: number;
+  creditAmount: number;
+  description?: string;
+  vatCode?: string;
+}
+
+export interface JournalEntryDraft {
+  id: string;
+  companyId: string;
+  name: string;
+  voucherNumber?: string;
+  documentDate?: string;
+  description?: string;
+  fiscalYearId?: string;
+  lines: JournalEntryDraftLine[];
+  attachmentIds: string[];
+  status: JournalEntryDraftStatus;
+  transactionId?: string;
+  createdBy: string;
+  createdAt: string;
+  updatedAt: string;
+}
+
+export interface CreateJournalEntryDraftInput {
+  companyId: string;
+  name: string;
+  voucherNumber?: string;
+  documentDate?: string;
+  description?: string;
+  fiscalYearId?: string;
+}
+
+export interface UpdateJournalEntryDraftInput {
+  id: string;
+  name?: string;
+  voucherNumber?: string;
+  documentDate?: string;
+  description?: string;
+  fiscalYearId?: string;
+  lines?: JournalEntryDraftLine[];
+  attachmentIds?: string[];
+}
+
+// Account balance type
+export interface AccountBalance {
+  id: string;
+  accountNumber: string;
+  name: string;
+  accountType: AccountType;
+  isActive: boolean;
+  totalDebits: number;
+  totalCredits: number;
+  netChange: number;
+  entryCount: number;
+}
diff --git a/frontend/src/types/periods.ts b/frontend/src/types/periods.ts
index 44d89cc..a554833 100644
--- a/frontend/src/types/periods.ts
+++ b/frontend/src/types/periods.ts
@@ -48,6 +48,14 @@ export interface FiscalYear {
   closedBy?: string;         // User who closed the year
   openingBalancePosted: boolean;
 
+  // Reopen tracking
+  reopenedDate?: string;     // When year was reopened
+  reopenedBy?: string;       // User who reopened the year
+
+  // Lock tracking
+  lockedDate?: string;       // When year was locked
+  lockedBy?: string;         // User who locked the year
+
   // Metadata
   createdAt: string;
   updatedAt: string;
diff --git a/frontend/tsconfig.tsbuildinfo b/frontend/tsconfig.tsbuildinfo
index a903e1d..91357a4 100644
--- a/frontend/tsconfig.tsbuildinfo
+++ b/frontend/tsconfig.tsbuildinfo
@@ -1 +1 @@
-{"root":["./src/app.tsx","./src/main.tsx","./src/routes.tsx","./src/vite-env.d.ts","./src/api/client.ts","./src/api/documentprocessing.ts","./src/api/mutations/accountmutations.ts","./src/api/mutations/bankconnectionmutations.ts","./src/api/mutations/companymutations.ts","./src/api/mutations/customermutations.ts","./src/api/mutations/draftmutations.ts","./src/api/mutations/fiscalyearmutations.ts","./src/api/mutations/invoicemutations.ts","./src/api/mutations/ordermutations.ts","./src/api/mutations/productmutations.ts","./src/api/mutations/saftmutations.ts","./src/api/queries/accountqueries.ts","./src/api/queries/bankconnectionqueries.ts","./src/api/queries/banktransactionqueries.ts","./src/api/queries/companyqueries.ts","./src/api/queries/customerqueries.ts","./src/api/queries/draftqueries.ts","./src/api/queries/fiscalyearqueries.ts","./src/api/queries/invoicequeries.ts","./src/api/queries/orderqueries.ts","./src/api/queries/productqueries.ts","./src/api/queries/vatqueries.ts","./src/components/auth/companyguard.tsx","./src/components/auth/protectedroute.tsx","./src/components/bank-reconciliation/documentuploadmodal.tsx","./src/components/company/useraccessmanager.tsx","./src/components/kassekladde/balanceimpactpanel.tsx","./src/components/layout/applayout.tsx","./src/components/layout/companyswitcher.tsx","./src/components/layout/fiscalyearselector.tsx","./src/components/layout/header.tsx","./src/components/layout/sidebar.tsx","./src/components/modals/closefiscalyearwizard.tsx","./src/components/modals/createfiscalyearmodal.tsx","./src/components/settings/bankconnectionstab.tsx","./src/components/shared/amounttext.tsx","./src/components/shared/attachmentupload.tsx","./src/components/shared/commandpalette.tsx","./src/components/shared/confirmationmodal.tsx","./src/components/shared/demodatadisclaimer.tsx","./src/components/shared/emptystate.tsx","./src/components/shared/errorboundary.tsx","./src/components/shared/fullpagedropzone.tsx","./src/components/shared/hotkeyprovider.tsx","./src/components/shared/isodatepicker.tsx","./src/components/shared/pageheader.tsx","./src/components/shared/periodfilter.tsx","./src/components/shared/shortcuttooltip.tsx","./src/components/shared/shortcutshelpmodal.tsx","./src/components/shared/skeletonloader.tsx","./src/components/shared/statisticcard.tsx","./src/components/shared/statusbadge.tsx","./src/components/shared/index.ts","./src/components/tables/datatable.tsx","./src/hooks/useautosave.ts","./src/hooks/usecompany.ts","./src/hooks/usedatatable.ts","./src/hooks/usepagehotkeys.ts","./src/hooks/useperiod.ts","./src/hooks/useresponsivemodal.ts","./src/lib/accounting.ts","./src/lib/errorhandling.ts","./src/lib/fiscalyear.ts","./src/lib/formatters.ts","./src/lib/keyboardshortcuts.ts","./src/lib/periods.ts","./src/lib/vatcalculation.ts","./src/lib/vatcodes.ts","./src/pages/admin.tsx","./src/pages/bankafstemning.tsx","./src/pages/companysetupwizard.tsx","./src/pages/dashboard.tsx","./src/pages/eksport.tsx","./src/pages/fakturaer.tsx","./src/pages/kassekladde.tsx","./src/pages/kontooversigt.tsx","./src/pages/kreditnotaer.tsx","./src/pages/kunder.tsx","./src/pages/loenforstaelse.tsx","./src/pages/momsindberetning.tsx","./src/pages/ordrer.tsx","./src/pages/produkter.tsx","./src/pages/settings.tsx","./src/pages/usersettings.tsx","./src/services/authservice.ts","./src/stores/authstore.ts","./src/stores/companystore.ts","./src/stores/hotkeystore.ts","./src/stores/periodstore.ts","./src/stores/reconciliationstore.ts","./src/stores/uistore.ts","./src/styles/designtokens.ts","./src/styles/theme.ts","./src/types/accounting.ts","./src/types/api.ts","./src/types/order.ts","./src/types/periods.ts","./src/types/product.ts","./src/types/ui.ts","./src/types/vat.ts"],"errors":true,"version":"5.6.3"}
\ No newline at end of file
+{"root":["./src/app.tsx","./src/main.tsx","./src/routes.tsx","./src/vite-env.d.ts","./src/api/client.ts","./src/api/documentprocessing.ts","./src/api/mutations/accountmutations.ts","./src/api/mutations/bankconnectionmutations.ts","./src/api/mutations/companymutations.ts","./src/api/mutations/customermutations.ts","./src/api/mutations/draftmutations.ts","./src/api/mutations/fiscalyearmutations.ts","./src/api/mutations/invoicemutations.ts","./src/api/mutations/ordermutations.ts","./src/api/mutations/productmutations.ts","./src/api/mutations/saftmutations.ts","./src/api/queries/accountqueries.ts","./src/api/queries/bankconnectionqueries.ts","./src/api/queries/banktransactionqueries.ts","./src/api/queries/companyqueries.ts","./src/api/queries/customerqueries.ts","./src/api/queries/draftqueries.ts","./src/api/queries/fiscalyearqueries.ts","./src/api/queries/invoicequeries.ts","./src/api/queries/orderqueries.ts","./src/api/queries/productqueries.ts","./src/api/queries/vatqueries.ts","./src/components/auth/companyguard.tsx","./src/components/auth/protectedroute.tsx","./src/components/bank-reconciliation/documentuploadmodal.tsx","./src/components/company/useraccessmanager.tsx","./src/components/kassekladde/balanceimpactpanel.tsx","./src/components/layout/applayout.tsx","./src/components/layout/companyswitcher.tsx","./src/components/layout/fiscalyearselector.tsx","./src/components/layout/header.tsx","./src/components/layout/sidebar.tsx","./src/components/modals/closefiscalyearwizard.tsx","./src/components/modals/createfiscalyearmodal.tsx","./src/components/settings/bankconnectionstab.tsx","./src/components/shared/amounttext.tsx","./src/components/shared/attachmentupload.tsx","./src/components/shared/commandpalette.tsx","./src/components/shared/confirmationmodal.tsx","./src/components/shared/demodatadisclaimer.tsx","./src/components/shared/emptystate.tsx","./src/components/shared/errorboundary.tsx","./src/components/shared/fullpagedropzone.tsx","./src/components/shared/hotkeyprovider.tsx","./src/components/shared/isodatepicker.tsx","./src/components/shared/pageheader.tsx","./src/components/shared/periodfilter.tsx","./src/components/shared/shortcuttooltip.tsx","./src/components/shared/shortcutshelpmodal.tsx","./src/components/shared/skeletonloader.tsx","./src/components/shared/statisticcard.tsx","./src/components/shared/statusbadge.tsx","./src/components/shared/index.ts","./src/components/tables/datatable.tsx","./src/hooks/useautosave.ts","./src/hooks/usecompany.ts","./src/hooks/usedatatable.ts","./src/hooks/usepagehotkeys.ts","./src/hooks/useperiod.ts","./src/hooks/useresponsivemodal.ts","./src/lib/accounting.ts","./src/lib/errorhandling.ts","./src/lib/fiscalyear.ts","./src/lib/formatters.ts","./src/lib/keyboardshortcuts.ts","./src/lib/periods.ts","./src/lib/vatcalculation.ts","./src/lib/vatcodes.ts","./src/pages/admin.tsx","./src/pages/bankafstemning.tsx","./src/pages/companysetupwizard.tsx","./src/pages/dashboard.tsx","./src/pages/eksport.tsx","./src/pages/fakturaer.tsx","./src/pages/kassekladde.tsx","./src/pages/kontooversigt.tsx","./src/pages/kreditnotaer.tsx","./src/pages/kunder.tsx","./src/pages/loenforstaelse.tsx","./src/pages/momsindberetning.tsx","./src/pages/ordrer.tsx","./src/pages/produkter.tsx","./src/pages/settings.tsx","./src/pages/usersettings.tsx","./src/services/authservice.ts","./src/stores/authstore.ts","./src/stores/companystore.ts","./src/stores/hotkeystore.ts","./src/stores/periodstore.ts","./src/stores/reconciliationstore.ts","./src/stores/uistore.ts","./src/styles/designtokens.ts","./src/styles/theme.ts","./src/types/accounting.ts","./src/types/api.ts","./src/types/order.ts","./src/types/periods.ts","./src/types/product.ts","./src/types/ui.ts","./src/types/vat.ts"],"version":"5.6.3"}
\ No newline at end of file