Some quick `npm audit` fixes

[freckletonj]

Add esbuild override:

  "overrides": {
      "@libsql/client": "^0.5.3",
      "esbuild": "0.25.4"
  },

Update next and wrangler:

"next": "^15.3.2",
"wrangler": "^4.14.4"

I don't think this breaks anything.

There's one remaining audit issue with xlsx that depends on a version that apparently exists, but is not on npmjs yet.

Off topic: it'd be nice to have better (any) installation instructions:

• mention the now existing linux AppImage in releases
• or just mention git clone > npm run dev
• mention that for Cloudflare D1 local, you can point to: .wrangler/state/v3/d1/miniflare-D1DatebaseObject/[id].sqlite
• mention firefox is not supported

Took me a minute to get up to speed. Thanks for this project!