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/i18n_parity_test.go

@@ -6,9 +6,9 @@ import (
 	"fmt"
 	"html/template"
 	"io/fs"
-	"path"
 	"net/http/httptest"
 	"os"
+	"path"
 	"path/filepath"
 	"reflect"
 	"regexp"
@@ -51,14 +51,19 @@ func i18nFixtureTime() time.Time { return time.Date(2026, 9, 14, 3, 12, 0, 0, ti
 // i18nTitleKeys mirrors the handlers' data["TitleKey"]: a page whose Go-side title has a key renders it
 // translated in English, exactly as addLanguageData does in production.
 var i18nTitleKeys = map[string]string{
-	"Indítópult":        "page.title.launcher",
-	"Biztonsági mentés": "page.title.backups",
-	"Vezérlőpult":             "page.title.dashboard",
-	"Alkalmazások":            "page.title.stacks",
-	"Rendszermonitor":         "page.title.monitoring",
-	"Beállítások":             "page.title.settings",
-	"Értesítések":             "page.title.settings_notifications",
-	"Biztonság és hozzáférés": "page.title.settings_security",
+	"Indítópult":                 "page.title.launcher",
+	"Biztonsági mentés":          "page.title.backups",
+	"Vezérlőpult":                "page.title.dashboard",
+	"Alkalmazások":               "page.title.stacks",
+	"Rendszermonitor":            "page.title.monitoring",
+	"Beállítások":                "page.title.settings",
+	"Értesítések":                "page.title.settings_notifications",
+	"Biztonság és hozzáférés":    "page.title.settings_security",
+	"Tárhely":                    "page.title.storage",
+	"Hálózati tárhely":           "page.title.storage_network",
+	"Új meghajtó inicializálása": "page.title.storage_init",
+	"Meglévő meghajtó csatolása": "page.title.storage_attach",
+	"Hálózati megosztás":         "page.title.sharing",
 }
 
 func i18nLayoutData(page, title string) map[string]interface{} {