fix: glossary selection respects target language — sort by source+target, reset on lang change, fix template import

- GlossarySelector: filteredGlossaries now sorts matching target_language
  first so FR→FA appears before FR→EN when translating to Persian
- GlossarySelector: toggle auto-select prefers glossary matching
  targetLang, falls back to first available
- useTranslationConfig: reset glossaryId when targetLang changes (was
  only resetting on sourceLang change)
- glossary_routes: set target_language from template data on import
  (was missing, defaulted to None/en)

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

routes/glossary_routes.py

@@ -597,6 +597,7 @@ async def import_glossary_template(
                 user_id=user.id,
                 name=glossary_name,
                 source_language=template_data.get("source_lang", "fr"),
+                target_language=template_data.get("target_lang", "en"),
                 created_at=datetime.now(timezone.utc),
                 updated_at=datetime.now(timezone.utc),
             )