Fix timestamps, delete requests, invoice dates and GR quantities

Apply the configured timezone to PHP and both DB connections, wrap
unwrapped ajax payloads so delete buttons reach their engines, normalise
and validate invoice due dates, reject stock quantities below the stored
4dp scale, and list stock movements across all warehouses.

app/assets/js/custom.js

@@ -772,6 +772,42 @@ function ajax_request(options) {
       // Override options.data with the full FormData object
       options.data = options.formData;
     }
+
+  } else if (
+    options.data && !(options.data instanceof FormData) &&
+    typeof options.data === 'object' && !('json' in options.data)
+  ) {
+
+    // autoPrepare: false with a plain field map — e.g. the delete buttons'
+    // `data: { id: id }`. db_auth.php only accepts a `json` string or a
+    // FormData post carrying `otp`, so an unwrapped map was rejected outright
+    // with "Request denied: No valid JSON payload or Form Data detected.", and
+    // `options.action` was dropped because only the autoPrepare branch applied
+    // it. Wrap it the same way here, without touching callers that already
+    // pass a ready-made `{ json: ... }`.
+    const session_element = document.getElementById('session-context');
+    const payload = {};
+
+    if (session_element) {
+      payload['company_id'] = session_element.dataset.companyId;
+      payload['otp']        = session_element.dataset.otp;
+    }
+
+    Object.entries(options.data).forEach(([key, value]) => {
+      payload[key] = value;
+    });
+
+    if (options.action) {
+      payload['action'] = (options.action === 'manage')
+        ? (payload['id'] ? 'update' : 'create')
+        : options.action;
+    }
+
+    options.data = { json: JSON.stringify(payload) };
+
+    if (options.debugMode) {
+      console.log("REQUEST DATA:", options.data);
+    }
   }
 
   // --- START MODIFIED $.AJAX BLOCK ---
@@ -1073,6 +1109,25 @@ function expand_exponential_number(value) {
   return sign + digits.slice(0, point) + '.' + digits.slice(point);
 }
 
+/**
+ * Format a stock quantity without hiding real data.
+ *
+ * Quantity columns are decimal(18,4), so a genuine 0.0001 exists. Formatting
+ * every quantity at 2 dp printed such a value as "0.00", which reads as "no
+ * data" — the stock popups and list pages all showed an empty-looking QTY for
+ * a receipt that had in fact been made. Show 2 dp normally, and the stored
+ * 4 dp whenever rounding to 2 would lose something.
+ */
+function format_quantity(value) {
+  var n = Number(value);
+  if (isNaN(n)) return '--';
+
+  return (round_dp(n, 2) !== round_dp(n, 4))
+    ? format_number(n, 4)
+    : format_number(n, 2);
+}
+
+
 function format_number(value, decimal) {
   var n = Number(value);
   if (isNaN(n)) return '--';
@@ -1184,7 +1239,7 @@ function show_stock_rows(source, source_id, label) {
           <td>${escape_html(r.warehouse_name)}</td>
           <td><small>${escape_html(location)}</small></td>
           <td><small>${escape_html(r.lot_number || '—')}</small></td>
-          <td class="text-end fw-semibold">${format_number(r.quantity, 2)}</td>
+          <td class="text-end fw-semibold">${format_quantity(r.quantity)}</td>
           <td>${status_badge}</td>
           <td><small>${format_date(r.date)}</small></td>
         </tr>`;