chore: sync the frontend template from a0fbafb to 5434760

Carries eight template commits: the provider sandbox actually running, release
admission to a named environment, the product feature manifest with its runtime
kill switch, architecture and documentation rules that match what is enforced,
the removability fixtures, and the browser, visual and performance evidence.

Product identity is unchanged. `package.json` keeps `tech-log-frontend` and the
catalog keeps the Tech Log naming; the home page was not in the delta. The
visual baselines are this product's own — the template's were excluded from the
transplant and these were regenerated here, where the only difference is the
platform overview's new product-feature section.

What this repository gains operationally: `config/runtime/{local,development,
staging,production}.json` with `FE-GATE-027` refusing an artifact whose runtime
document does not match the environment it is being admitted to, and
`FEATURE_OVERRIDES` for taking an installed feature out of service without a
rebuild.

Verified here: eight gates green, build green, visual 5/5, and 1,858 of 1,859
tests in the suites that do not need a sandbox — the one failure passes in
isolation and is a jsdom lazy-chunk timeout under parallel load. The provider
suites cannot run on this machine at all: `kernel.apparmor_restrict_unprivileged
_userns=1` makes `bwrap --unshare-net` fail, reproducible without any code from
either repository.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

src/presentation/i18n/catalog.ts

@@ -79,6 +79,10 @@ const PLATFORM_KO_MESSAGES = {
   "route.invalid.title": "올바르지 않은 주소입니다.",
   "route.invalid.description": "주소의 경로 또는 검색 조건을 확인해 주세요.",
   "route.invalid.action": "안전한 탐색 링크를 사용해 주세요.",
+  "route.disabledFeature.title": "현재 사용할 수 없는 기능입니다.",
+  "route.disabledFeature.description":
+    "이 기능은 배포 설정에서 중지되어 있습니다. 코드에는 포함되어 있으며 운영자가 다시 켤 수 있습니다.",
+  "route.disabledFeature.action": "다른 탐색 링크를 사용해 주세요.",
   "route.auth.integration.title": "로그인 연동이 필요합니다.",
   "route.auth.integration.description":
     "외부 인증 소유자가 연결되면 이 보호 라우트를 사용할 수 있습니다.",
@@ -233,6 +237,10 @@ const PLATFORM_EN_MESSAGES = {
   "route.invalid.title": "This address is invalid.",
   "route.invalid.description": "Check the path and search parameters.",
   "route.invalid.action": "Use a safe navigation link.",
+  "route.disabledFeature.title": "This feature is not available right now.",
+  "route.disabledFeature.description":
+    "The deployment configuration has switched it off. It is still part of this build and an operator can switch it back on.",
+  "route.disabledFeature.action": "Use another navigation link.",
   "route.auth.integration.title": "Sign-in integration is required.",
   "route.auth.integration.description":
     "This protected route is available after an external authentication owner is connected.",