20260316h: Recipe ingredient USE popup with qty/location controls

- Clicking 'Usa' on a recipe ingredient now opens a modal popup instead of
  directly consuming. Shows location selector, quantity controls (+/- buttons),
  conf/sub-unit mode, and 'Usa TUTTO' option.
- Quantity is pre-filled with the recipe's suggested amount
- Auto-selects location with opened package
- After use, shows move-after-use modal (stays on recipe page, not dashboard)
- Separate recipe-context move functions (showRecipeMoveModal, confirmRecipeMove)
- Modal overlay z-index 250 to appear above recipe dialog

assets/css/style.css

@@ -1672,6 +1672,10 @@ body {
     padding: 0;
 }
 
+#modal-overlay {
+    z-index: 250;
+}
+
 .modal-content {
     background: var(--bg-card);
     border-radius: var(--radius) var(--radius) 0 0;