feat: Journal list, category pages, pagination, tokens and pl/en strings

- index and category pages paginate with ?page=N and 404 out of range
- category content renders above the list through the html gate
- related posts fall back to the latest posts
- --journal-* tokens and neutral base styles
- pl/en strings registered only for locales the app enables

lib/journal-module.ts

@@ -19,6 +19,18 @@ const PAGE_FILES: Record<keyof JournalRoutes, string> = {
 }
 
 const pagesDir = fileURLToPath(new URL('../app/journal-pages/', import.meta.url))
+const langDir = fileURLToPath(new URL('../i18n/locales/', import.meta.url))
+
+/** UI string locales the layer ships, each in i18n/locales/<code>.json. */
+const LAYER_LOCALES = ['pl', 'en'] as const
+
+/** Locale codes the project enables in its i18n config (strings or objects). */
+function enabledLocaleCodes(locales: unknown): string[] {
+  if (!Array.isArray(locales)) return []
+  return locales
+    .map((l) => (typeof l === 'string' ? l : l && typeof l === 'object' ? (l as { code?: unknown }).code : undefined))
+    .filter((c): c is string => typeof c === 'string')
+}
 
 export default defineNuxtModule<JournalModuleOptions>({
   meta: {
@@ -43,6 +55,20 @@ export default defineNuxtModule<JournalModuleOptions>({
       }
     })
 
+    // Register the layer's strings only for locales the app enables. The
+    // layer config declares no locales: @nuxtjs/i18n merges every locale a
+    // layer declares into the app, which would add /en routes to an app that
+    // enables only pl.
+    const hook = nuxt.hook as unknown as (
+      name: 'i18n:registerModule',
+      fn: (register: (config: { langDir: string; locales: Array<{ code: string; file: string }> }) => void) => void,
+    ) => void
+    hook('i18n:registerModule', (register) => {
+      const enabled = enabledLocaleCodes((nuxt.options as { i18n?: { locales?: unknown } }).i18n?.locales)
+      const locales = LAYER_LOCALES.filter((code) => enabled.includes(code)).map((code) => ({ code, file: `${code}.json` }))
+      if (locales.length > 0) register({ langDir, locales })
+    })
+
     // The public runtime config carries the resolved options next to apiBase,
     // so pages, links and the sitemap source read one source of truth.
     const pub = nuxt.options.runtimeConfig.public as Record<string, any>