v0.319.0: the app page in panels, the login in one place, a password the box never had is said in words

- style A (operator 2026-10-16): hero, tab bar and every section are panels on --bg-1, one width, 16px apart;
  the install page's form groups use the same rule; the settings tab's 700px inner wrapper is gone
- „Belépés az alkalmazásba": name + password side by side, fetched on demand (R-254, R-709); pairing in app_login.go
- the empty-value rule: no stored value -> a sentence, never an eye; page and reveal endpoint share storedValuePresent
- „Cím és kulcsok" is rows (no Domain input, no disabled storage select, no install form); hint under the title
- tests red-proved: app_page_tuning_test.go (4); 36 app-page parity fixtures re-captured, 4 new; install fixtures unchanged

Claude-Session: https://claude.ai/code/session_012qRErfCoiTkvDK9N5XHbzb

controller/internal/web/testdata/i18n_parity/app_guide_full.html

@@ -218,14 +218,25 @@
 
 
 
+<script>
 
+function appShotGone(img) {
+    img.style.display = 'none';
+    var box = img.parentNode, left = false;
+    box.querySelectorAll('img').forEach(function (i) { if (i.style.display !== 'none') { left = true; } });
+    if (!left) { box.closest('.app-section').style.display = 'none'; }
+}
+</script>
+
+<div class="app-section" data-screenshots-section="1">
 <div class="app-screenshots" id="screenshots">
     <img src="/static/assets/privatebin-screenshot-1.webp" alt="" class="app-screenshot"
-         onerror="this.style.display='none'">
+         onerror="appShotGone(this)">
     <img src="/static/assets/privatebin-screenshot-2.webp" alt="" class="app-screenshot"
-         onerror="this.style.display='none'">
+         onerror="appShotGone(this)">
     <img src="/static/assets/privatebin-screenshot-3.webp" alt="" class="app-screenshot"
-         onerror="this.style.display='none'">
+         onerror="appShotGone(this)">
+</div>
 </div>
 
 
@@ -262,7 +273,7 @@
 
 
 <div class="app-guide" data-guide="1" data-guide-checked="2.0.6">
-    <div class="app-section" style="margin-top:1rem" data-guide-section="1">
+    <div class="app-section" data-guide-section="1">
         <h3>Első bekapcsolás</h3>
         <p>Nyisd meg a böngészőben.</p>
         
@@ -270,7 +281,7 @@
         </ol>
         
     </div>
-    <div class="app-section" style="margin-top:1rem" data-guide-section="1">
+    <div class="app-section" data-guide-section="1">
         <h3>Megosztás másokkal</h3>
         
         
@@ -278,7 +289,7 @@
         </ol>
         
     </div>
-    <div class="app-section" style="margin-top:1rem" data-guide-faq="1">
+    <div class="app-section" data-guide-faq="1">
         <h3>Gyakori kérdések</h3>
         <dl class="app-faq">
             <dt>Hol vannak a fájlok?</dt>