Feature/post media translations (#42)

* chore: updated todo with translation ideas

* feat: first take at the implementation of translations

* fix: small addition for the translation feature

* feat: support language switching in the editor and preview

* feat: better handling of long bodies by not running them through a json envelope

* fix: unknown macros have better fallback

* feat: api for python to get translations

* fix: strip dumb prefix of content in translation

* feat: extend meta diff for translations

* feat: hook up translations to rebuild-from-disk

* feat: generation of the website prefers project language, falling back to canonical language

* fix: crashes during rendering

* feat: translation validation report

* fix: made the translation validation actually work

* chore: reorganization of menu

* fix: some topics cleanup

* chore: updated doc

* feat: translations for media

* feat: more aligned in UI/UX

* feat: edit translations possible

* chore: added full multi-language todo

* chore: updated todo for clarity

* feat: implementation of full multi-linguality

* fix: page creation creates pages

* fix: flags on every page

* fix: better prompt

* feat: made MCP server aware of language content

* feat: python tools for translations

* fix: better fill-in-translations

* fix: better prompt for translation. maybe.

* fix: losing posts from search due to translation process

* fix: translation validation handles in-db content and fill-in of missing translations fixed to flush

* fix: faster scanning for infilling of missing translations

* chore: updated agent instructions

* feat: calendar and tag cloud respect current language now

* fix: retries going up

* fix: got metadata-diff and rebuild into sync

* fix: extended meta-diff for timestamps

* fix: made website validation look at translated content, too

* fix: multi-lingual search

* chore: refactor Editor.tsx into two separate editors

* feat: do language detection when no explicit language given

---------

Co-authored-by: hugo <hugoms@me.com>

tests/engine/ValidationApplyPlannerService.test.ts

@@ -92,4 +92,49 @@ describe('ValidationApplyPlannerService', () => {
     expect(targeted.requestedPageSlugs.has('about')).toBe(true);
     expect(targeted.requestRootRoutes).toBe(true);
   });
+
+  it('classifies language-prefixed missing paths into per-language plans', () => {
+    const plan = planMissingValidationPaths(
+      [
+        '/fr/',
+        '/fr/page/2',
+        '/fr/category/news',
+        '/fr/tag/dev',
+        '/fr/2025/01/15/my-post',
+        '/fr/2025',
+        '/fr/2025/01',
+        '/fr/about',
+        '/de/',
+        '/de/category/tech',
+      ],
+      ['fr', 'de'],
+    );
+
+    expect(plan.requiresFallbackSectionRender).toBe(false);
+    expect(plan.requestRootRoutes).toBe(false);
+
+    const frPlan = plan.languagePlans.get('fr');
+    expect(frPlan).toBeDefined();
+    expect(frPlan!.requestRootRoutes).toBe(true);
+    expect(Array.from(frPlan!.requestedCategories)).toEqual(['news']);
+    expect(Array.from(frPlan!.requestedTags)).toEqual(['dev']);
+    expect(frPlan!.requestedPostRoutes).toEqual([
+      { year: 2025, month: 1, day: 15, slug: 'my-post' },
+    ]);
+    expect(Array.from(frPlan!.requestedYears)).toContain(2025);
+    expect(Array.from(frPlan!.requestedYearMonths)).toContain('2025/01');
+    expect(Array.from(frPlan!.requestedPageSlugs)).toEqual(['about']);
+
+    const dePlan = plan.languagePlans.get('de');
+    expect(dePlan).toBeDefined();
+    expect(dePlan!.requestRootRoutes).toBe(true);
+    expect(Array.from(dePlan!.requestedCategories)).toEqual(['tech']);
+  });
+
+  it('treats unknown prefixes as page slugs when no languages specified', () => {
+    const plan = planMissingValidationPaths(['/fr/category/news', '/fr/']);
+
+    expect(plan.languagePlans.size).toBe(0);
+    expect(plan.requiresFallbackSectionRender).toBe(true);
+  });
 });