chore(deps): pin exact versions and update to latest (#72)
* chore(deps): pin exact dependency versions
Remove ^ prefixes from all dependency versions in package.json and
pnpm-workspace.yaml catalog entries. Pin versions to the actual
installed versions from the previous lockfile to avoid regressions.
* chore(deps): update all dependencies to latest stable versions
Major: isomorphic-dompurify 2→3 (import API change).
Minor/patch: marked 17.0.3, tailwind-merge 3.5.0,
tailwindcss 4.2.0, @tailwindcss/postcss 4.2.0.
Catalog: commitlint 20.4.2, @types/node 25.3.0.
ESLint pinned to 9.39.3 (eslint-config-next ecosystem
does not yet support ESLint 10).
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