feat: enlarge hero image and add medium-zoom for image lightbox

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

package-lock.json

@@ -47,6 +47,7 @@
         "lodash-es": "^4.17.23",
         "lru-cache": "^11.2.7",
         "marked": "^17.0.5",
+        "medium-zoom": "^1.1.0",
         "p-map": "^7.0.4",
         "picomatch": "^4.0.4",
         "proper-lockfile": "^4.1.2",
@@ -5416,6 +5417,12 @@
         "node": ">= 0.8"
       }
     },
+    "node_modules/medium-zoom": {
+      "version": "1.1.0",
+      "resolved": "https://registry.npmmirror.com/medium-zoom/-/medium-zoom-1.1.0.tgz",
+      "integrity": "sha512-ewyDsp7k4InCUp3jRmwHBRFGyjBimKps/AJLjRSox+2q/2H4p/PNpQf+pwONWlJiOudkBXtbdmVbFjqyybfTmQ==",
+      "license": "MIT"
+    },
     "node_modules/merge-descriptors": {
       "version": "2.0.0",
       "resolved": "https://registry.npmmirror.com/merge-descriptors/-/merge-descriptors-2.0.0.tgz",