Migrated public UMD apps to rolldown-vite

[9larsons]

ref PLA-96

Summary

Workstream F1 of the Rolldown migration: puts Ghost's public UMD apps (portal, comments-ui, signup-form, sodo-search, announcement-bar) on rolldown-vite@7.3.1. These ship to site visitors via CDN, so this is a draft pending review + the runtime gate before merge.

Admin apps are untouched — they stay on stock vite@7.3.2. The migration is scoped via a new named catalog.

Changes

• pnpm-workspace.yaml: new rolldown catalog → vite: npm:rolldown-vite@7.3.1. The 5 public apps' vite dep now points at catalog:rolldown; every other workspace keeps catalog: (stock vite@7.3.2).
• apps/portal/vite.config.mjs: removed build.rollupOptions.output.manualChunks: false. Rolldown rejects the false literal (manualChunks is not a function); lib mode + cssCodeSplit:false already yield a single chunk.
• apps/_shared/vite-public-app.mjs: replaced the @rollup/plugin-commonjs dynamicRequireTargets glob with a new i18nLocaleBundlePlugin.

The i18n regression this fixes

ghost/i18n's generateResources() loads translations with a dynamic require(\../locales/${locale}/${ns}.json`). Under Rollup this was resolved at build time by @rollup/plugin-commonjs's dynamicRequireTargets`, which eagerly bundled every locale file.

Rolldown does not implement dynamicRequireTargets. Left as-is, the dynamic require fell through and portal shrank from 2.4 MB → 907 KB, shipping English only — every non-English site would silently lose its translations.

The new plugin re-expresses the same intent bundler-agnostically: it enumerates every locales/<locale>/<ns>.json for the app's namespace, statically imports them, and rewrites the dynamic require to read from that registry. All 62 locale files bundle again.

Output verification (Rolldown vs. prior Rollup build)

App	Baseline	Rolldown	Δ	Locales	Notes
portal	2,423,157	2,429,323	+0.3%	62/62 ✅
comments-ui	860,427	856,531	−0.5%	✅	252/252 unit tests pass
signup-form	264,049	256,153	−3.0%	✅
sodo-search	274,869	267,218	−2.8%	✅	umd/main.css still emitted (load-bearing)
announcement-bar	136,094	133,210	−2.1%	n/a

• UMD wrapper: identical self-executing define.amd ? define([],e) : e() form in every app (empty AMD deps array vs. Rollup's no-arg define(e) — semantically equivalent).
• i18n: all locale files bundle for all 4 i18n apps (verified string-presence across de/fr/es/ja/ru/zh/nb + full 62-file sweep for portal).
• sodo-search still emits umd/main.css by name — theme templates reference it via sodoSearch.styles.

Size deltas are within noise (rolldown-vite's oxc minifier vs. esbuild/terser). No output-correctness risks found.

Not in scope / follow-ups

• Runtime gate (loading the built bundles in a real theme) — required before un-drafting.
• Empty rollupOptions: {output: {}} blocks in comments-ui/signup-form left as-is (no-ops under Rolldown, which aliases rollupOptions).

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