v3.32.1: "Start counter value" in the outfile import

The import created presets with the store's default counter (1).  Cards
whose counters are already past it had to be edited preset by preset
afterwards.

- The outfile preview form gains a "Start counter value" field (default
  1, the store's value).  The value is written into every created keyset
  of every imported card - parse_outfile's `start_counter`, 1-10 hex
  digits, whitespace stripped and uppercased; a bad value raises and the
  endpoint answers 400.  Without it the store's default still applies
  (the field is omitted), so the API keeps its old behaviour.
- The preview shows the counter; an import stores the protocol's
  10-digit form (counter_hex).
- Docs: api.md (the field), help EN/RU (the form).
- Version strings + the PWA cache bumped together (simple-v459).

Tests: the parser (every keyset, normalisation, unset, the bad values),
the endpoint (the preview's keysets, the 400, the stored padded form),
the PWA (the field's default, the controls' normalisation, both bodies).
1008 Python + 953 frontend green.

frontend/index.html

@@ -1943,7 +1943,7 @@
 // ===== Version =====
 // Single source of truth for the PWA version: shown in the header and used
 // by the server version check in pysimConnect().
-const SIMPLE_VERSION = '3.32.0';
+const SIMPLE_VERSION = '3.32.1';
 document.getElementById('app-version').textContent = 'v' + SIMPLE_VERSION;
 
 // ===== view history (the browser Back/Forward buttons) =====
@@ -15154,7 +15154,7 @@ async function cardsOutfileFile(input) {
 	}
 	_cardsOutfile = { text: text, file: String(file.name || ''),
 		name: String(file.name || '').replace(/\.[^.]+$/, ''),
-		algorithm16: '3des2', mode: 'merge', preview: null };
+		algorithm16: '3des2', cntr: '1', mode: 'merge', preview: null };
 	_cardsOutfileTars = 0;
 	cardsOutfileRender();
 	await cardsOutfilePreview();
@@ -15177,6 +15177,7 @@ function cardsOutfileControls() {
 	const val = id => { const el = document.getElementById(id); return el ? String(el.value) : ''; };
 	if (document.getElementById('cards-of-name')) o.name = val('cards-of-name').trim();
 	if (document.getElementById('cards-of-algo')) o.algorithm16 = val('cards-of-algo') || '3des2';
+	if (document.getElementById('cards-of-cntr')) o.cntr = val('cards-of-cntr').trim().toUpperCase();
 	if (document.getElementById('cards-of-mode')) {
 		o.mode = val('cards-of-mode') === 'replace' ? 'replace' : 'merge';
 	}
@@ -15371,6 +15372,13 @@ function cardsOutfileRender() {
 		'<select id="cards-of-mode" class="block mt-0.5 border border-gray-300 dark:border-slate-600 text-sm rounded px-2 py-1 dark:bg-slate-800">' +
 		'<option value="merge"' + (o.mode === 'replace' ? '' : ' selected') + '>' + esc(t('Merge')) + '</option>' +
 		'<option value="replace"' + (o.mode === 'replace' ? ' selected' : '') + '>' + esc(t('Replace')) + '</option></select></label>';
+	// The counter every created keyset starts from (v3.32.1): the store's
+	// default, editable for cards whose counter is already past it.
+	html += '<label class="text-xs text-gray-600 dark:text-slate-400" title="' +
+		esc(t('The counter every created keyset starts from (1-10 hex digits); the store default is 1')) + '">' +
+		esc(t('Start counter value')) +
+		'<input id="cards-of-cntr" class="block mt-0.5 w-24 border border-gray-300 dark:border-slate-600 text-sm rounded px-2 py-1 dark:bg-slate-800 font-mono" maxlength="10" value="' +
+		escHtml(o.cntr || '1') + '" onchange="cardsOutfilePreview()"></label>';
 	html += '</div>';
 	html += '<div class="text-xs text-gray-600 dark:text-slate-400 mb-1">' + esc(t('TAR table')) + '</div>';
 	html += '<div id="cards-of-tars">' + cardsOutfileTarRowsHtml() + '</div>';
@@ -15393,7 +15401,7 @@ async function cardsOutfilePreview() {
 	cardsOutfileControls();
 	const body = {
 		text: o.text, name: o.name, algorithm16: o.algorithm16,
-		tars: cardsOutfileTarsFromForm(),
+		tars: cardsOutfileTarsFromForm(), start_counter: o.cntr,
 	};
 	try {
 		o.preview = await pysimFetchOk('/api/presets/import-outfile', body);
@@ -15418,7 +15426,7 @@ async function cardsOutfileImport() {
 	if (btn) btn.disabled = true;
 	const body = {
 		text: o.text, name: o.name, algorithm16: o.algorithm16,
-		tars: cardsOutfileTarsFromForm(), mode: o.mode,
+		tars: cardsOutfileTarsFromForm(), start_counter: o.cntr, mode: o.mode,
 	};
 	try {
 		const res = await pysimFetchOk('/api/presets/import-outfile', body);
@@ -24012,6 +24020,8 @@ const LANG_RU = {
 	'Common name': 'Общее имя',
 	'16-byte keys': '16-байтные ключи',
 	'This TAR needs a keyset (its MSL requires security)': 'Этому TAR нужен keyset (его MSL требует защиты)',
+	'Start counter value': 'Начальное значение счётчика',
+	'The counter every created keyset starts from (1-10 hex digits); the store default is 1': 'Счётчик, с которого начинается каждый созданный keyset (1–10 hex-цифр); по умолчанию в хранилище — 1',
 	'The file is invalid - fix it and refresh the preview': 'Файл некорректен — исправьте его и обновите предпросмотр',
 	'Import mode': 'Режим импорта',
 	'Merge': 'Дополнить',