chore(deps): bump vite to ^8.1.4, keeping VitePress-dependent packages pinned to a compatible range (#398)

## Pull Request Checklist
     
  Please ensure that your PR meets the following requirements:

  - [x] I have read the [CONTRIBUTING](CONTRIBUTING.md) guide.
  - [ ] I have updated the documentation (if applicable).
  - [x] My code follows the style guidelines of this project.
  - [x] I have performed a self-review of my own code.
- [ ] I have added tests that prove my fix is effective or that my
feature works.
  - [x] New and existing unit tests pass locally with my changes.

  ## Description

Bumps `vite` to `^8.1.4` across all manifests (devDependencies and
pnpm/npm overrides) and regenerates the corresponding lockfiles: root,
`examples/javascript-web`,
`moss-live-labs/examples/image-search/react-app`,
`packages/moss-md-indexer` (and its `example/`), and
  `packages/vitepress-plugin-moss` (and its `demo-site/`).

Also adds `@vue/language-core` as an explicit devDependency in
`packages/vitepress-plugin-moss` it's an optional peer of `unplugin-dts`
(via
`vite-plugin-dts`) that was previously pulled into the dependency graph
transitively, but stopped being resolved after the vite bump, breaking
the `.d.ts` build. Declaring it explicitly (pinned to `^3.2.7`, matching
the existing `pnpm.overrides` entry) fixes it.

Verified `vitepress-plugin-moss` builds and its test suite (45 tests)
passes, `moss-md-indexer` builds, and `examples/javascript-web` builds
  under vite 8.1.4.

  Fixes #362

  ## Type of Change

  - [x] Bug fix (non-breaking change which fixes an issue)
  - [ ] New feature (non-breaking change which adds functionality)
- [ ] Breaking change (fix or feature that would cause existing
functionality to not work as expected)
  - [ ] This change requires a documentation update

Author: rohanshrma222

examples/javascript-web/package-lock.json

@@ -4,6 +4,9 @@
   "description": "Examples for the Moss Browser SDK (@moss-dev/moss-web) - in-browser semantic search powered by WASM",
   "private": true,
   "type": "module",
+  "engines": {
+    "node": "^20.19.0 || >=22.12.0"
+  },
   "scripts": {
     "dev": "vite",
     "build": "vite build",
@@ -18,6 +21,6 @@
   },
   "devDependencies": {
     "typescript": "^5.7.0",
-    "vite": "^8.0.16"
+    "vite": "^8.1.4"
   }
 }

examples/javascript-web/package.json

@@ -28,6 +28,6 @@
     "globals": "^16.0.0",
     "typescript": "~5.7.2",
     "typescript-eslint": "^8.26.1",
-    "vite": "^8.1.3"
+    "vite": "^8.1.4"
   }
 }