* build: migrate frontend tooling from yarn to pnpm
The Dockerfiles ran `yarn && yarn build`, which broke on node:24 (yarn no
longer on PATH; the corepack yarn shim made `npm i -g yarn` fail EEXIST),
while CI + Makefile used npm and only a yarn.lock was committed — an
inconsistent yarn/npm split. Standardize on pnpm, pinned via the
packageManager field + corepack.
- package.json: packageManager pnpm@11.6.0.
- pnpm-workspace.yaml: nodeLinker: hoisted (flat node_modules, npm/yarn-like, so
directly-imported transitive deps like flatpickr resolve) + allow vue-demi's
postinstall (it selects the Vue 3 entry). pnpm 11 reads these here, not .npmrc.
- Generate pnpm-lock.yaml (imported from yarn.lock); delete yarn.lock.
- Dockerfiles (dev/nginx/production): node:24 + `corepack enable && pnpm install --frozen-lockfile && pnpm build`.
- CI (check.yaml, docker.yaml): pnpm/action-setup + setup-node cache:pnpm; pnpm install --frozen-lockfile / pnpm build.
- Makefile, composer.json dev script, CLAUDE.md: npm/yarn -> pnpm.
pnpm build verified on a clean install (1425 modules, hoisted node_modules).
* fix(build): pin vite to 8.0.3 to fix rolldown chunk regression
vite 8.0.16 (pulled in by #653) bundles rolldown 1.0.3, which emits a
lazy chunk referencing an undefined Vue runtime-init function
(init_runtime_dom_esm_bundler), breaking the SPA at runtime. The build
succeeds so CI never caught it. Pin vite to 8.0.3 (the version 2.3.3
shipped, rolldown 1.0.0) which produces a correct bundle.
