fix(#240): use annotationCount as denominator in queue thresholds

The ready-to-read and transcription queue queries were dividing
reviewed blocks by textedBlockCount instead of annotationCount.
A document with 4/15 annotations typed — all 4 reviewed — scored
4/4 = 100 % and incorrectly appeared in the Lesefertig column.

Both queries now compute the ratio as:
  reviewed / annotationCount

so a document must have ≥ 90 % of all its drawn regions reviewed
before it graduates to Lesefertig.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

backend/src/main/java/org/raddatz/familienarchiv/repository/DocumentRepository.java

@@ -193,12 +193,9 @@ public interface DocumentRepository extends JpaRepository<Document, UUID>, JpaSp
             GROUP BY d.id, d.title, d.meta_date
             HAVING COUNT(DISTINCT da.id) > 0
                AND (
-                 COUNT(DISTINCT CASE WHEN tb.text IS NOT NULL AND tb.text <> '' THEN tb.id END) = 0
-                 OR (
-                   COUNT(DISTINCT CASE WHEN tb.reviewed = true THEN tb.id END)::float /
-                   NULLIF(COUNT(DISTINCT CASE WHEN tb.text IS NOT NULL AND tb.text <> '' THEN tb.id END), 0)
-                 ) < 0.90
-               )
+                 COUNT(DISTINCT CASE WHEN tb.reviewed = true THEN tb.id END)::float /
+                 COUNT(DISTINCT da.id)
+               ) < 0.90
             ORDER BY COUNT(DISTINCT CASE WHEN tb.text IS NOT NULL AND tb.text <> '' THEN tb.id END) DESC,
                      HASHTEXT(d.id::text || EXTRACT(WEEK FROM NOW())::int::text)
             LIMIT :limit
@@ -216,14 +213,13 @@ public interface DocumentRepository extends JpaRepository<Document, UUID>, JpaSp
             LEFT JOIN transcription_blocks tb ON tb.document_id = d.id
             GROUP BY d.id, d.title, d.meta_date
             HAVING COUNT(DISTINCT da.id) > 0
-               AND COUNT(DISTINCT CASE WHEN tb.text IS NOT NULL AND tb.text <> '' THEN tb.id END) > 0
                AND (
                  COUNT(DISTINCT CASE WHEN tb.reviewed = true THEN tb.id END)::float /
-                 COUNT(DISTINCT CASE WHEN tb.text IS NOT NULL AND tb.text <> '' THEN tb.id END)
+                 COUNT(DISTINCT da.id)
                ) >= 0.90
             ORDER BY (
                 COUNT(DISTINCT CASE WHEN tb.reviewed = true THEN tb.id END)::float /
-                COUNT(DISTINCT CASE WHEN tb.text IS NOT NULL AND tb.text <> '' THEN tb.id END)
+                COUNT(DISTINCT da.id)
               ) DESC
             LIMIT :limit
             """)