Add selectable base currency to form header

Replace static base currency badge with a currency dropdown (makeCDD).
Changing the selection updates state.baseCurrency, re-renders all item/line
blocks so closures capture the new base, and recalculates totals. All
dynamic references to CFG['currency-base'] replaced with state.baseCurrency.

https://claude.ai/code/session_014uUwDBtG5y5FuWcy5zqVD1

index.html

@@ -140,12 +140,12 @@ async function loadConfig() {
 }
 
 // ========== STATE ==========
-const state = { staff: '', periodFrom: '', periodTo: '', items: [], _grandTotal: 0 };
+const state = { staff: '', periodFrom: '', periodTo: '', baseCurrency: CFG['currency-base'], items: [], _grandTotal: 0 };
 
 function newItem() { return { id: uid(), name: '', lines: [newLine()], _subtotal: 0 }; }
 function newLine() {
   return {
-    id: uid(), date: '', description: '', currency: CFG['currency-base'],
+    id: uid(), date: '', description: '', currency: state.baseCurrency,
     fxRate: '1.00000', vendor: '', hasReceipt: true, receipts: [],
     noReceiptExplanation: '', amount: '', account: '', program: '', programOther: ''
   };
@@ -164,11 +164,11 @@ function recalc() {
     item._subtotal = sub;
     grand += sub;
     const se = $(`#sub-${item.id}`);
-    if (se) se.textContent = `${CFG['currency-base']} ${fmtAmt(sub)}`;
+    if (se) se.textContent = `${state.baseCurrency} ${fmtAmt(sub)}`;
   });
   state._grandTotal = grand;
   const ge = $('#grand-total');
-  if (ge) ge.textContent = `${CFG['currency-base']} ${fmtAmt(grand)}`;
+  if (ge) ge.textContent = `${state.baseCurrency} ${fmtAmt(grand)}`;
 }
 
 // ========== CURRENCY DROPDOWN ==========
@@ -246,13 +246,21 @@ function render() {
   const toInput = el('input', {type:'date', value: state.periodTo});
   toInput.addEventListener('change', () => { state.periodTo = toInput.value; });
 
-  const baseBadge = el('span', {style:{fontWeight:'600', fontSize:'14px', padding:'7px 0'}}, CFG['currency-base']);
+  const baseCurDD = makeCDD(CFG.currencies || [], state.baseCurrency, code => {
+    state.baseCurrency = code;
+    const box = $('#items-box');
+    if (box) {
+      box.innerHTML = '';
+      state.items.forEach(item => box.appendChild(renderItem(item)));
+    }
+    recalc();
+  });
 
   wrap.appendChild(el('div', {className:'frow'}, [
     el('div', {className:'fgrp grow'}, [el('label', null, 'Staff'), staffInput]),
     el('div', {className:'fgrp'}, [el('label', null, 'Period from'), fromInput]),
     el('div', {className:'fgrp'}, [el('label', null, 'to'), toInput]),
-    el('div', {className:'fgrp'}, [el('label', null, 'Base currency'), baseBadge]),
+    el('div', {className:'fgrp'}, [el('label', null, 'Base currency'), baseCurDD]),
   ]));
 
   wrap.appendChild(el('hr', {className:'divider'}));
@@ -274,7 +282,7 @@ function render() {
     addItemBtn,
     el('div', {className:'grand-total'}, [
       'Total reimbursement claim: ',
-      el('span', {id:'grand-total'}, `${CFG['currency-base']} ${fmtAmt(0)}`)
+      el('span', {id:'grand-total'}, `${state.baseCurrency} ${fmtAmt(0)}`)
     ])
   ]));
 
@@ -301,7 +309,7 @@ function renderItem(item) {
   blk.appendChild(el('div', {className:'item-hdr'}, [
     el('label', null, 'Item / Project / Travel'),
     el('span', {className:'item-subtotal'}, [
-      'Subtotal: ', el('span', {id:`sub-${item.id}`}, `${CFG['currency-base']} ${fmtAmt(0)}`)
+      'Subtotal: ', el('span', {id:`sub-${item.id}`}, `${state.baseCurrency} ${fmtAmt(0)}`)
     ]),
     rmBtn
   ]));
@@ -327,7 +335,7 @@ function renderLine(ln, item) {
   const blk = el('div', {className:'line-blk', id:`line-${ln.id}`});
 
   const currencies = CFG.currencies || [];
-  const baseCur = CFG['currency-base'];
+  const baseCur = state.baseCurrency;
 
   // Row 1: Date, Description, Currency, FX Rate
   const dateIn = el('input', {type:'date', value: ln.date, style:{width:'140px'}});
@@ -461,7 +469,7 @@ function validate() {
       if (!ln.vendor.trim()) errs.push(`${lx}: Vendor is required.`);
       const amt = parseFloat(ln.amount);
       if (isNaN(amt) || amt <= 0) errs.push(`${lx}: Amount must be a positive number.`);
-      if (ln.currency !== CFG['currency-base']) {
+      if (ln.currency !== state.baseCurrency) {
         const rate = parseFloat(ln.fxRate);
         if (isNaN(rate) || rate <= 0) errs.push(`${lx}: FX rate must be a positive number.`);
       }
@@ -499,7 +507,7 @@ async function generatePDF() {
   const black = rgb(0.13, 0.13, 0.13);
   const gray = rgb(0.45, 0.45, 0.45);
   const lineCol = rgb(0.75, 0.75, 0.75);
-  const baseCur = CFG['currency-base'];
+  const baseCur = state.baseCurrency;
 
   // Logo
   let logoImage = null;