fix: bust CSS cache (v20260505b) + bump webapp to v1.7.2

style.css was still served with ?v=20260421a so all CSS changes since
April 21 (scale indicator redesign, banner close button fix, etc.) were
invisible in the kiosk WebView — it used the cached old file.

Bumping manifest.json version 1.7.1→1.7.2 causes the auto-update
detector (_checkWebappUpdate) to fire on the kiosk: it compares the
loaded page version (1.7.1) with the server version (1.7.2), detects
a change, and shows the '⬆️ Aggiorna' badge so the user can reload.

index.html

@@ -11,7 +11,7 @@
     <title>EverShelf</title>
     <link rel="manifest" href="manifest.json">
     <link rel="icon" type="image/png" href="assets/img/logo/logo_icon.png">
-    <link rel="stylesheet" href="assets/css/style.css?v=20260421a">
+    <link rel="stylesheet" href="assets/css/style.css?v=20260505b">
     <!-- QuaggaJS for barcode scanning -->
     <script src="https://cdn.jsdelivr.net/npm/@ericblade/quagga2@1.8.4/dist/quagga.min.js"></script>
     <!-- @xenova/transformers: ES-module bootstrap that exposes a lazy category-classifier as window._categoryPipelinePromise -->
@@ -67,7 +67,7 @@
         <!-- Title — left-aligned; grows to fill space -->
         <div class="header-title-wrap">
             <h1 class="header-title" onclick="showPage('dashboard')">
-                <img src="assets/img/logo/logo_icon.png" alt="" class="header-logo-icon" aria-hidden="true" /><span data-i18n="nav.title">EverShelf</span><span class="header-version">v1.7.1</span>
+                <img src="assets/img/logo/logo_icon.png" alt="" class="header-logo-icon" aria-hidden="true" /><span data-i18n="nav.title">EverShelf</span><span class="header-version">v1.7.2</span>
             </h1>
             <!-- Update badge — shown alongside title, never replaces it -->
             <span class="header-update-badge" id="header-update-badge" style="display:none"></span>

manifest.json

@@ -2,7 +2,7 @@
     "name": "EverShelf",
     "short_name": "EverShelf",
     "description": "Gestione completa della dispensa di casa con scansione barcode",
-    "version": "1.7.1",
+    "version": "1.7.2",
     "start_url": "/evershelf/",
     "display": "standalone",
     "background_color": "#f0f4e8",