Revert "feat(bolt-vite-react-ts): modernize toolchain and remove eslint (#120)"

[xKevIsDev]

Reverts #120 (commit 9e5405c).

bolt-vite-react-ts goes back to its pre-#120 state: Vite 5, React 18 types, Tailwind 3 with tailwind.config.js and postcss.config.js, ESLint restored, and src/vite-env.d.ts back.

Conflict resolution

package.json and package-lock.json conflicted because #121 landed afterwards and tightened the @types/react / @types/react-dom ranges from ^19.2.18 to ~19.2.18 — versions that #120 itself introduced. Those lines disappear entirely in the revert, so both files were resolved to their pre-#120 state. The resulting tree is byte-identical to be9cf85 for every path #120 touched.

Notes

• The @/ path alias and its prompt line from feat(bolt-vite-react-ts): add @/ path alias for src #116 / docs(bolt-vite-react-ts): clarify @/ alias mapping in template prompt #117 are untouched. Only the Tailwind v4 and Vite 8 paragraphs added by feat(bolt-vite-react-ts): modernize toolchain and remove eslint #120 were removed from .bolt/prompt.
• The removeFileHash change in test/utils/index.ts is reverted along with everything else. It is only used by test/bolt-vite-react-ts.test.ts, whose inline snapshot feat(bolt-vite-react-ts): modernize toolchain and remove eslint #120 never changed, so the old /-\w*/ regex lines up with Vite 5 output again.

Test plan

• bolt-vite-react-ts tests pass (build produces index.css / index.js, dev server preview updates on edit)
• package-lock check passes

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[linear-code]

Issue reopened: BOAI-983 Modernize our bolt-vite-react-ts starter template