fix(widgets): hero title/subtitle/CTA now locale-aware

P0-3: hero widget text rendered hardcoded English on every locale
(ru/hy included) because HeroWidgetData source props were plain
strings with no per-locale variant, unlike nav labels which already
support a locale map (NavigationLocalizedText).

DataSourceResolverService.toHeroData() now accepts either a plain
string (existing tenants unaffected) or a per-locale text map for
title/subtitle/ctaLabel and each slide's fields, resolved against
the active language the same way footer group titles already are
(LocalizedTextContent, current lang -> en -> first available).

Updated the mock bootstrap fixture's hero props to a real ru/en/hy
map so the demo tenant shows translated copy instead of English on
every locale. No editor UI change needed: the Widgets section's
existing JSON-fallback editor already accepts arbitrary prop shapes.

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

src/assets/mock/bootstrap/bootstrap.json

@@ -398,9 +398,21 @@
               },
               "visible": true,
               "props": {
-                "title": "Welcome to Marketplace Platform",
-                "subtitle": "Configuration-driven multi-tenant commerce",
-                "ctaLabel": "Start Shopping"
+                "title": {
+                  "ru": "Добро пожаловать на Маркетплейс",
+                  "en": "Welcome to Marketplace Platform",
+                  "hy": "Բարի գալուստ Մարքեթփլեյս"
+                },
+                "subtitle": {
+                  "ru": "Конфигурируемая мультитенантная торговая площадка",
+                  "en": "Configuration-driven multi-tenant commerce",
+                  "hy": "Կոնֆիգուրացիայով կառավարվող բազմատենանտ առևտրի հարթակ"
+                },
+                "ctaLabel": {
+                  "ru": "Начать покупки",
+                  "en": "Start Shopping",
+                  "hy": "Սկսել գնումները"
+                }
               }
             }
           ]