fix(media-proxy): rasterize svg responses (#1298)

fluxer_media_proxy/src/output_format.rs

@@ -20,12 +20,16 @@ pub struct OutputSelection {
 pub fn is_output_format_supported(ext: AssetExtension) -> bool {
     !matches!(
         ext,
-        AssetExtension::Avif | AssetExtension::Heic | AssetExtension::Heif | AssetExtension::Jxl
+        AssetExtension::Avif
+            | AssetExtension::Heic
+            | AssetExtension::Heif
+            | AssetExtension::Jxl
+            | AssetExtension::Svg
     )
 }
 
 pub fn can_encode_to(ext: AssetExtension) -> bool {
-    is_output_format_supported(ext) && ext != AssetExtension::Svg
+    is_output_format_supported(ext)
 }
 
 pub fn coerce_unsupported_format(ext: AssetExtension) -> AssetExtension {
@@ -80,6 +84,18 @@ mod tests {
         assert_eq!("url-coerced", r.reason);
     }
 
+    #[test]
+    fn svg_url_extension_coerces_to_webp() {
+        let r = select_url_variant(Input {
+            kind: AssetKind::Avatar,
+            original: AssetExtension::Svg,
+            requested_size: Some(128),
+            manual_format_override: None,
+        });
+        assert_eq!(AssetExtension::Webp, r.format);
+        assert_eq!("url-coerced", r.reason);
+    }
+
     #[test]
     fn manual_query_format_wins_over_url_extension() {
         let r = select_url_variant(Input {