feat: add release notes overlay with Markdown rendering

- Replace truncated plaintext release notes with full-screen overlay
  rendered via `marked` library
- Server reconnection does a hard page reload instead of custom event

server/package-lock.json

@@ -10,7 +10,8 @@
       "license": "ISC",
       "dependencies": {
         "chart.js": "^4.5.1",
-        "elkjs": "^0.11.1"
+        "elkjs": "^0.11.1",
+        "marked": "^17.0.5"
       },
       "devDependencies": {
         "esbuild": "^0.27.4",
@@ -495,6 +496,17 @@
         "@esbuild/win32-x64": "0.27.4"
       }
     },
+    "node_modules/marked": {
+      "version": "17.0.5",
+      "resolved": "https://registry.npmjs.org/marked/-/marked-17.0.5.tgz",
+      "integrity": "sha512-6hLvc0/JEbRjRgzI6wnT2P1XuM1/RrrDEX0kPt0N7jGm1133g6X7DlxFasUIx+72aKAr904GTxhSLDrd5DIlZg==",
+      "bin": {
+        "marked": "bin/marked.js"
+      },
+      "engines": {
+        "node": ">= 20"
+      }
+    },
     "node_modules/typescript": {
       "version": "5.9.3",
       "resolved": "https://registry.npmjs.org/typescript/-/typescript-5.9.3.tgz",
@@ -744,6 +756,11 @@
         "@esbuild/win32-x64": "0.27.4"
       }
     },
+    "marked": {
+      "version": "17.0.5",
+      "resolved": "https://registry.npmjs.org/marked/-/marked-17.0.5.tgz",
+      "integrity": "sha512-6hLvc0/JEbRjRgzI6wnT2P1XuM1/RrrDEX0kPt0N7jGm1133g6X7DlxFasUIx+72aKAr904GTxhSLDrd5DIlZg=="
+    },
     "typescript": {
       "version": "5.9.3",
       "resolved": "https://registry.npmjs.org/typescript/-/typescript-5.9.3.tgz",