ui: keep the selected file in state, drop the File: title line

The File: EF.DIR [LF] line doubled as the selection store: pysimFsClickFile
wrote a formatted display string there and pysimFsRead/Save parsed it back
(stripping '✗ ' and ' [TYPE]'). The pane now keeps the name in
pysimFsSelected, the redundant title is gone (FID/type/size/FCI remain in
the info block), and the dead pysimFsSelect() plus the unused 'File:' RU
entry are removed. Read/Save still re-select on the server first: pySim's
current selection is a shared cursor that tree expansion, scans and
commands move, so it cannot identify the file shown in the pane.

SW cache v121 -> v122; structural test updated.

frontend/index.html

@@ -866,7 +866,6 @@
 				</div>
 				<div class="flex-1">
 					<div id="pysim-fs-detail" class="hidden">
-						<div class="text-xs font-mono mb-1"><span data-l10n="File:">File:</span> <b id="pysim-fs-filename"></b></div>
 						<div id="pysim-fs-info" class="mb-1"></div>
 						<div id="pysim-fs-content" class="w-full font-mono text-xs border border-gray-300 dark:border-slate-600 rounded px-2 py-1.5 bg-gray-100 dark:bg-slate-800 min-h-20 overflow-y-auto"></div>
 						<div class="flex gap-2 mt-1 items-center">
@@ -6125,6 +6124,8 @@ async function pysimFsToggleDir(name) {
 	if (node.expanded) pysimRefresh();
 }
 
+let pysimFsSelected = null;
+
 function pysimFsInfoHtml(sel) {
 	if (!sel) return '';
 	const num = v => (v === null || v === undefined) ? null : String(v);
@@ -6153,10 +6154,7 @@ async function pysimFsClickFile(name) {
 		if (!exists) node.children = [];
 		pysimFsRenderTree();
 	}
-	const ft = exists ? sel.file_type : null;
-	const label = ({ transparent: 'TR', linear_fixed: 'LF', cyclic: 'CY', ber_tlv: 'BT', df: 'DF' })[ft] || '';
-	const prefix = exists ? '' : '✗ ';
-	document.getElementById('pysim-fs-filename').textContent = prefix + name + (label ? ' [' + label + ']' : '');
+	pysimFsSelected = name;
 	document.getElementById('pysim-fs-info').innerHTML = exists ? pysimFsInfoHtml(sel) : '';
 	document.getElementById('pysim-fs-content').innerHTML = '';
 	document.getElementById('pysim-fs-status').textContent = exists ? '' : '✗ File not found on card';
@@ -6169,7 +6167,7 @@ async function pysimFsClickFile(name) {
 }
 
 async function pysimFsRead() {
-	const rawName = document.getElementById('pysim-fs-filename').textContent.replace(/ \[.*?\]$/, '').replace(/^✗ /, '');
+	const rawName = pysimFsSelected;
 	const out = document.getElementById('pysim-fs-content');
 	const statusEl = document.getElementById('pysim-fs-status');
 	out.innerHTML = '';
@@ -6204,18 +6202,6 @@ async function pysimFsRead() {
 	}
 }
 
-async function pysimFsSelect() {
-	const name = document.getElementById('pysim-fs-filename').textContent;
-	const node = pysimFsFindNode(name, pysimFsTreeRoot);
-	if (node && node.fid) {
-		await pysimFetch('/api/command', { cmd: 'select ' + node.fid });
-	} else {
-		await pysimFetch('/api/command', { cmd: 'select ' + name });
-	}
-	pysimFsRefresh();
-	pysimRefresh();
-}
-
 let pysimFsEditMode = false;
 let pysimFsEditData = null;
 
@@ -6249,7 +6235,7 @@ function pysimFsCancel() {
 }
 
 async function pysimFsSave() {
-	const rawName = document.getElementById('pysim-fs-filename').textContent.replace(/ \[.*?\]$/, '').replace(/^✗ /, '');
+	const rawName = pysimFsSelected;
 	const statusEl = document.getElementById('pysim-fs-status');
 	const out = document.getElementById('pysim-fs-content');
 	const node = pysimFsFindNode(rawName, pysimFsTreeRoot);
@@ -9220,7 +9206,6 @@ const LANG_RU = {
 	'Execute': 'Выполнить',
 	'Send': 'Отправить',
 	'Custom files are added in file manager tree and included in card scan.': 'Пользовательские файлы добавляются в менеджер файлов и учитываются при чтении карт.',
-	'File:': 'Файл:',
 	'Cancel': 'Отмена',
 	'Timeout': 'Таймаут',
 	'OK': 'OK',

frontend/sw.js

@@ -1,4 +1,4 @@
-const CACHE = 'otaman-v121';
+const CACHE = 'otaman-v122';
 const URLS = [
   'index.html',
   'help.html',

frontend/tests/html.test.js

@@ -69,11 +69,15 @@ test('file manager has a probe-all-files button and status line', () => {
     assert.ok(html.includes('id="pysim-fs-probe-status"'));
 });
 
-test('file manager shows decoded FCI info under the file name', () => {
-    const name = html.indexOf('id="pysim-fs-filename"');
+test('file manager shows FCI info and keeps the selection in state, not the DOM', () => {
+    const detail = html.indexOf('id="pysim-fs-detail"');
     const info = html.indexOf('id="pysim-fs-info"');
     const content = html.indexOf('id="pysim-fs-content"');
-    assert.ok(name !== -1 && info > name && info < content, 'pysim-fs-info must sit between filename and content');
+    assert.ok(detail !== -1 && info > detail && info < content, 'pysim-fs-info must sit above the content');
     assert.ok(html.includes('function pysimFsInfoHtml'));
     assert.ok(html.includes("pysimFsInfoHtml(sel)"));
+    assert.ok(!html.includes('pysim-fs-filename'));
+    assert.ok(html.includes('let pysimFsSelected = null;'));
+    assert.ok(html.includes('pysimFsSelected = name;'));
+    assert.ok(!html.includes('pysimFsSelect()'));
 });