chore: update dependencies and configuration for project consistency

- Updated several npm dependencies to their latest versions.
- Enabled mermaid diagram support in documentation.
- Set `global.IS_REACT_ACT_ENVIRONMENT` for React testing compatibility.
- Added `exact` package installation configuration in `bunfig.toml`.

Author: codeBelt

bun.lock

@@ -1,2 +1,4 @@
 [test]
 preload = ["./happydom.ts"]
+[install]
+exact = true

bunfig.toml

@@ -18,8 +18,8 @@
     "tailwindcss": "4.1.18"
   },
   "devDependencies": {
-    "@types/react": "^19",
-    "@types/react-dom": "^19",
+    "@types/react": "19.2.14",
+    "@types/react-dom": "19.2.3",
     "@types/bun": "latest"
   }
 }

examples/rendering/bun.lock

@@ -1,3 +1,6 @@
 import {GlobalRegistrator} from '@happy-dom/global-registrator';
 
 GlobalRegistrator.register();
+
+// @ts-expect-error
+global.IS_REACT_ACT_ENVIRONMENT = true;

examples/rendering/package.json

@@ -67,9 +67,9 @@
     "react": ">=18.0.0"
   },
   "devDependencies": {
-    "@biomejs/biome": "2.3.15",
-    "@changesets/changelog-github": "^0.5.2",
-    "@changesets/cli": "^2.29.8",
+    "@biomejs/biome": "2.4.0",
+    "@changesets/changelog-github": "0.5.2",
+    "@changesets/cli": "2.29.8",
     "@happy-dom/global-registrator": "20.6.1",
     "@types/bun": "1.3.9",
     "@types/react": "19.2.14",