feat(bolt-vite-react-ts): upgrade to vite 8

[sheepsteak]

Problem

bolt-vite-react-ts is still on Vite 5 (vite ^5.4.2, @vitejs/plugin-react ^4.3.1), while bolt-slides moved to Vite 8 in #121. The previous attempt (#120) bundled Vite 8 with React 19, Tailwind 4, TypeScript 6, and removing ESLint, and was reverted in #123.

Solution

Upgrade only the build tooling: vite to ^8.3.3 and @vitejs/plugin-react to ^6.1.2 (the v6 line targets Vite 8). React 18, Tailwind 3 with PostCSS, ESLint, TypeScript, and vite.config.ts are unchanged. The existing resolve.alias and optimizeDeps.exclude options still work in Vite 8.

Implementation Details

• Lockfile: regenerated with the repo's pinned npm 10.2.3, and npm ci passes with it. Only the Vite toolchain moved: Babel, esbuild, and Rollup drop out, Rolldown and Lightning CSS come in, and postcss goes from 8.4 to 8.5 because Vite 8 requires ^8.5.28.
• removeFileHash: reapplies the fix from feat(bolt-vite-react-ts): modernize toolchain and remove eslint #120. Vite hashes are base64url and can contain -, so the regex now strips from the first - up to the file extension.
• Assets snapshot: sorted before comparing, because readdir in the WebContainer returned index.js before index.css. Older Vite 5 checkouts of the template fail the same way, so the ordering isn't specific to Vite 8.
• .bolt/prompt: unchanged. The Vite 8 note feat(bolt-vite-react-ts): modernize toolchain and remove eslint #120 added was about resolve.tsconfigPaths, which this PR doesn't adopt.
• Other bolt-* templates: bolt-slides is already on Vite 8, and bolt-expo (Metro) and bolt-remotion (Webpack) don't use Vite. bolt-qwik stays on Vite 5: Qwik 1.x, including the latest 1.20.2, declares vite: ">=5 <8", so npm install fails with ERESOLVE, and even with overrides the client build fails under Rolldown. Vite 8 needs the Qwik 2 migration (@qwik.dev/core, currently 2.0.0-rc.2), which can wait until Qwik 2 is stable.

Test plan

• npm ci, npm run build, npm run typecheck, tsc --noEmit -p tsconfig.node.json, and npm run lint pass in bolt-vite-react-ts
• Dev server starts on Vite 8.3.3 and resolves @/ imports
• test/bolt-vite-react-ts.test.ts passes in Chromium (build in a WebContainer, dev server preview updates on edit)
• Firefox test project
• New Bolt project from this template

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