don't use svg icons, they aren't supported in coversion

pipeline/04_best_icon/select.sql

@@ -6,7 +6,7 @@
 --   2. Other square sizes ≤64
 --   3. Non-square sizes ≤64 on both axes
 --   4. Anything larger (downloaded because rel_sizes was undeclared)
---   5. Among equal priority: prefer PNG/GIF/ICO over WebP over SVG
+--   5. Among equal priority: prefer PNG/GIF/ICO over WebP (SVGs excluded — not supported in bundle generation)
 --   6. Tiebreaker: smaller file size (less bandwidth in bundles)
 --
 -- Usage: psql $DATABASE_URL -f pipeline/04_best_icon/select.sql
@@ -17,6 +17,7 @@ FROM (
   FROM icons i
   WHERE i.scan_state = 'completed'
     AND i.s3_key IS NOT NULL
+    AND i.content_type NOT IN ('image/svg+xml')
   ORDER BY i.host_id,
     CASE
       WHEN i.width = i.height AND i.width IN (64, 48, 32, 16) THEN 0
@@ -28,8 +29,7 @@ FROM (
     CASE
       WHEN i.content_type IN ('image/png', 'image/gif', 'image/x-icon', 'image/vnd.microsoft.icon') THEN 0
       WHEN i.content_type = 'image/webp' THEN 1
-      WHEN i.content_type = 'image/svg+xml' THEN 2
-      ELSE 3
+      ELSE 2
     END,
     i.file_size ASC
 ) sub