fix(docs): prebundle fastdom for Mermaid

[yuyinws]

Description

Running pnpm docs currently and open browser fails with:

Uncaught SyntaxError: The requested module '/node_modules/.pnpm/fastdom@1.0.12/node_modules/fastdom/fastdom.js?v=5c4dc56b' does not provide an export named 'default' (at bisector.js:56:1)

This PR adds fastdom and fastdom/extensions/fastdom-promised.js to Vite’s dependency optimization list.

upstream issue: emersonbottero/vitepress-plugin-mermaid#98

[pkg-pr-new]

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@vitejs/devtools

npm i https://pkg.pr.new/@vitejs/devtools@567

@vitejs/devtools-kit

npm i https://pkg.pr.new/@vitejs/devtools-kit@567

@vitejs/devtools-oxc

npm i https://pkg.pr.new/@vitejs/devtools-oxc@567

@vitejs/devtools-rolldown

npm i https://pkg.pr.new/@vitejs/devtools-rolldown@567

@vitejs/devtools-vite

npm i https://pkg.pr.new/@vitejs/devtools-vite@567

@vitejs/devtools-vitest

npm i https://pkg.pr.new/@vitejs/devtools-vitest@567

commit: 86a607a