Add product version display on single product page (v0.3.4)

- Display current version under product title for licensed products
- Add frontend CSS styling for version badge
- Update translations for new "Version:" string
- Bump version to 0.3.4

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

composer.lock

@@ -12,7 +12,7 @@
             "source": {
                 "type": "git",
                 "url": "https://src.bundespruefstelle.ch/magdev/wc-licensed-product-client.git",
-                "reference": "83037ea0c2d9e365cf9ec0ad50251d3ebc7e4782"
+                "reference": "a3a957914fd6ef74cb479e213d1d3bc0606f496b"
             },
             "require": {
                 "php": "^8.3",
@@ -52,7 +52,7 @@
                 "issues": "https://src.bundespruefstelle.ch/magdev/wc-licensed-product-client/issues",
                 "source": "https://src.bundespruefstelle.ch/magdev/wc-licensed-product-client"
             },
-            "time": "2026-01-22T15:24:57+00:00"
+            "time": "2026-01-22T20:05:48+00:00"
         },
         {
             "name": "psr/cache",