feat: store and display per-patient sync detail in historial

- Add detalle_json column to sync_wa_log via migration
- guardar_sync_log() now stores doc, nombre, action, examenes count per patient
- Historial table shows "Ver N" button that expands a row with patient list,
  action badge (Nuevo/Actualizado/Omitido) and exam count per patient

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

app/database.py

@@ -14,6 +14,10 @@ def get_connection():
 
 
 def _migrate(conn):
+    sync_cols = {r[1] for r in conn.execute("PRAGMA table_info(sync_wa_log)")}
+    if "detalle_json" not in sync_cols:
+        conn.execute("ALTER TABLE sync_wa_log ADD COLUMN detalle_json TEXT")
+
     cols = {r[1] for r in conn.execute("PRAGMA table_info(envios)")}
     if "idrecepcion" not in cols:
         conn.execute("ALTER TABLE envios ADD COLUMN idrecepcion INTEGER")