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

app/composables/useJournalLinks.ts

@@ -0,0 +1,23 @@
+// Links to Journal views, built from stable route names through
+// useLocalePath() (i18n gives every route a per-locale name), never from
+// concatenated paths. A link to a disabled view (journal.routes.<key>: false)
+// is null; components then render plain text.
+
+import { JOURNAL_ROUTE_NAMES } from '../utils/routes.ts'
+import type { JournalRoutes } from '../utils/types.ts'
+
+export function useJournalLinks() {
+  const localePath = useLocalePath()
+  const routes = (useRuntimeConfig().public.journal as { routes: JournalRoutes }).routes
+
+  const link = (key: keyof JournalRoutes, params?: Record<string, string>, query?: Record<string, string>) =>
+    routes[key] === false ? null : localePath({ name: JOURNAL_ROUTE_NAMES[key], params, query })
+
+  return {
+    postLink: (slug: string) => link('post', { slug }),
+    categoryLink: (slug: string) => link('category', { category: slug }),
+    tagLink: (slug: string) => link('tag', { tag: slug }),
+    authorLink: (slug: string) => link('author', { author: slug }),
+    indexLink: (page: number = 1) => link('index', undefined, page > 1 ? { page: String(page) } : undefined),
+  }
+}