i18n slice 1 release C: parity cases + fixtures captured from UNCONVERTED templates

storage, storage_network, storage_init, storage_attach, sharing, login, claim,
launcher_shared, launcher_share_password, catchall, debug. Case completeness checked with the
coverage probe on a trial conversion.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_0159rPz1ZhFKsS53msqPYxtS

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

@@ -0,0 +1,40 @@
+
+<!DOCTYPE html>
+<html lang="hu">
+<head>
+    <meta charset="UTF-8">
+    <meta name="viewport" content="width=device-width, initial-scale=1.0">
+    <title>Bejelentkezés — Felhom</title>
+    <link rel="stylesheet" href="/static/style.css">
+</head>
+<body class="login-body">
+    <div class="login-card">
+        <img src="/static/felhom-logo.svg?v=0.250.0" alt="Felhom.eu" class="login-logo">
+        <h1 class="login-title">Otthoni <span class="title-accent">vezérlőpult</span></h1>
+        <p class="login-subtitle">Teszt Ügyfél</p>
+        <div class="alert alert-info">Sikeres kijelentkezés most.</div>
+        <div class="alert alert-error">Hibás jelszó lett megadva.</div>
+        <form method="POST" action="/login">
+            <input type="hidden" name="next" id="next-field" value="">
+            <div class="form-group">
+                <label for="password">Jelszó</label>
+                <input type="password" id="password" name="password" required autofocus
+                       placeholder="Adja meg a jelszavát" class="form-control">
+            </div>
+            <button type="submit" class="btn btn-primary btn-full">Bejelentkezés</button>
+        </form>
+        <p style="text-align:center;margin:0.75rem 0 0;font-size:0.85rem"><a href="/claim">Elfelejtett jelszó</a></p>
+        <p class="login-footer">Felhom — Otthoni szerver kezelés<br>
+        <a href="https://felhom.eu" target="_blank">felhom.eu</a></p>
+    </div>
+    <script>
+    (function() {
+        var params = new URLSearchParams(window.location.search);
+        var next = params.get('next');
+        if (next) {
+            document.getElementById('next-field').value = next;
+        }
+    })();
+    </script>
+</body>
+</html>