i18n slice 1 release C: storage, sharing, sign-in, guest, catch-all and debug pages in English

- 11 templates converted (storage, storage_network, storage_init, storage_attach, sharing, login,
  claim, launcher_shared, launcher_share_password, catchall, debug); every key translated.
  Six ASCII-only Hungarian JS fragments the extractor missed were found by eye and converted by hand
  (", majd a(z)", "FIGYELEM:", "jelenlegi:", "mp", "p", " db").
- login, claim, both guest share pages and the catch-all render through executeTemplateLang (the
  household language; no session CSRF, no escrow reminder). renderLogin now takes the request.
- Page titles: TitleKey for storage, network storage, the two drive wizards and sharing.
  TestHandlerTitleKeysMatchHungarianTitle pins handler literal == hu.json value for every TitleKey.
- Tests: TestDirectRenderHandlersFollowLanguage (real routes, en + hu),
  TestI18nDirectRenderPagesHaveNoAdminChrome (escrow reminder due; none on the guest page).
- Fixture correction: the release C cases had invented page titles; the cases now carry the handlers'
  real titles (and the wizard pages their real page name), and those 12 fixtures were RE-CAPTURED from
  the unconverted templates at 0555091. The diff to the old fixtures is the <title> line (and the nav
  highlight on the two wizard pages) only.
- i18n gate: HU_FORMAL_CEILING 12 -> 16 — four more „ön" forms in the converted copy, unchanged by rule (R-516).

Hungarian: byte-identical (TestI18nParity against fixtures from unconverted templates).

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

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

@@ -112,10 +112,10 @@
             <li><a href="/dashboard" class=""><svg class="ico"><use href="#i-layout-grid"/></svg>Vezérlőpult</a></li>
             <li><a href="/stacks" class=""><svg class="ico"><use href="#i-cloud"/></svg>Alkalmazások</a></li>
             
-            <li class="nav-group is-open">
-                <button type="button" class="nav-group-toggle active" aria-expanded="true" aria-controls="nav-group-storage"><svg class="ico"><use href="#i-hard-drive"/></svg>Tárhely<svg class="ico nav-chevron"><use href="#i-chevron-down"/></svg></button>
+            <li class="nav-group">
+                <button type="button" class="nav-group-toggle" aria-expanded="false" aria-controls="nav-group-storage"><svg class="ico"><use href="#i-hard-drive"/></svg>Tárhely<svg class="ico nav-chevron"><use href="#i-chevron-down"/></svg></button>
                 <ul id="nav-group-storage" class="nav-links nav-links-sub nav-links-nested">
-                    <li><a href="/storage" class="active">Meghajtók</a></li>
+                    <li><a href="/storage" class="">Meghajtók</a></li>
                     <li><a href="/storage/network" class="">Hálózati tárhely</a></li>
                 </ul>
             </li>