Docs: reflect SCP80 tab grouping (Secured Packet + Cards); SW v24

The Secured Packet and Cards views moved under a single top-level SCP80
tab switched by two pills. Update README and help (EN+RU) section
titles/descriptions to match; bump service-worker cache so the precached
help pages are re-fetched.

README.md

@@ -274,9 +274,9 @@ Optional TLV objects appended to the INSTALL data field:
 
 ---
 
-## Secured Packet Tab
+## SCP80 Tab — Secured Packet
 
-Assembles secured packets per ETSI TS 102 225.
+The **SCP80** top-level tab groups SCP80-related views, switched by two pills: **Secured Packet** (this section) and **Cards**. Assembles secured packets per ETSI TS 102 225.
 
 ### Packet structure
 

frontend/help-ru.html

@@ -201,8 +201,8 @@
 
 
 <section class="mb-10">
-	<h2 id="secured-packet" class="text-xl font-semibold mb-3 border-b border-gray-300 dark:border-slate-700 pb-1">3. Вкладка Secured Packet</h2>
+	<h2 id="secured-packet" class="text-xl font-semibold mb-3 border-b border-gray-300 dark:border-slate-700 pb-1">3. Вкладка SCP80 — Secured Packet</h2>
-	<p class="mb-3">Сборка защищённых пакетов SCP80 по ETSI TS 102 225.</p>
+	<p class="mb-3">Верхнеуровневая вкладка <strong>SCP80</strong> объединяет разделы, связанные с SCP80. Переключение — двумя переключателями: <strong>Secured Packet</strong> (этот раздел) и <strong>Cards</strong> (раздел 5). Собирает защищённые пакеты SCP80 по ETSI TS 102 225.</p>
 	<h3 id="packet-structure" class="text-lg font-medium mb-2">Структура пакета</h3>
 	<table class="w-full text-sm mb-3 border-collapse">
 		<thead><tr class="border-b border-gray-300 dark:border-slate-700"><th class="text-left py-1 px-2">Поле</th><th class="text-left py-1 px-2">Размер</th><th class="text-left py-1 px-2">Описание</th></tr></thead>
@@ -245,8 +245,8 @@
 
 
 <section class="mb-10">
-	<h2 id="cards" class="text-xl font-semibold mb-3 border-b border-gray-300 dark:border-slate-700 pb-1">5. Вкладка Cards</h2>
+	<h2 id="cards" class="text-xl font-semibold mb-3 border-b border-gray-300 dark:border-slate-700 pb-1">5. Вкладка SCP80 — Cards</h2>
-	<p class="mb-3">Хранит предустановки карт локально в браузере (<code class="font-mono text-sm">localStorage</code>), чтобы вкладка Secured Packet могла автоматически подставлять ключи и параметры.</p>
+	<p class="mb-3">Второй переключатель вкладки <strong>SCP80</strong>. Хранит предустановки карт локально в браузере (<code class="font-mono text-sm">localStorage</code>), чтобы представление Secured Packet могло автоматически подставлять ключи и параметры.</p>
 	<table class="w-full text-sm mb-3 border-collapse">
 		<thead><tr class="border-b border-gray-300 dark:border-slate-700"><th class="text-left py-1 px-2">Поле</th><th class="text-left py-1 px-2">Описание</th></tr></thead>
 		<tbody>

frontend/help.html

@@ -201,8 +201,8 @@
 
 
 <section class="mb-10">
-	<h2 id="secured-packet" class="text-xl font-semibold mb-3 border-b border-gray-300 dark:border-slate-700 pb-1">3. Secured Packet tab</h2>
+	<h2 id="secured-packet" class="text-xl font-semibold mb-3 border-b border-gray-300 dark:border-slate-700 pb-1">3. SCP80 tab — Secured Packet</h2>
-	<p class="mb-3">Assembles SCP80 secured packets per ETSI TS 102 225.</p>
+	<p class="mb-3">The <strong>SCP80</strong> top-level tab groups the SCP80-related views. It is switched by two pills: <strong>Secured Packet</strong> (this section) and <strong>Cards</strong> (section 5). Assembles SCP80 secured packets per ETSI TS 102 225.</p>
 	<h3 id="packet-structure" class="text-lg font-medium mb-2">Packet structure</h3>
 	<table class="w-full text-sm mb-3 border-collapse">
 		<thead><tr class="border-b border-gray-300 dark:border-slate-700"><th class="text-left py-1 px-2">Field</th><th class="text-left py-1 px-2">Size</th><th class="text-left py-1 px-2">Description</th></tr></thead>
@@ -245,8 +245,8 @@
 
 
 <section class="mb-10">
-	<h2 id="cards" class="text-xl font-semibold mb-3 border-b border-gray-300 dark:border-slate-700 pb-1">5. Cards tab</h2>
+	<h2 id="cards" class="text-xl font-semibold mb-3 border-b border-gray-300 dark:border-slate-700 pb-1">5. SCP80 tab — Cards</h2>
-	<p class="mb-3">Stores card presets locally in the browser (<code class="font-mono text-sm">localStorage</code>) so the Secured Packet tab can auto-fill keys and parameters.</p>
+	<p class="mb-3">The second pill of the <strong>SCP80</strong> tab. Stores card presets locally in the browser (<code class="font-mono text-sm">localStorage</code>) so the Secured Packet view can auto-fill keys and parameters.</p>
 	<table class="w-full text-sm mb-3 border-collapse">
 		<thead><tr class="border-b border-gray-300 dark:border-slate-700"><th class="text-left py-1 px-2">Field</th><th class="text-left py-1 px-2">Description</th></tr></thead>
 		<tbody>

frontend/sw.js

@@ -1,4 +1,4 @@
-const CACHE = 'otaman-v23';
+const CACHE = 'otaman-v24';
 const URLS = [
   'index.html',
   'help.html',