Fix errors in theme2

crates/gpui2/src/elements/img.rs

@@ -23,6 +23,18 @@ impl From<SharedString> for ImageSource {
     }
 }
 
+impl From<&'static str> for ImageSource {
+    fn from(uri: &'static str) -> Self {
+        Self::Uri(uri.into())
+    }
+}
+
+impl From<String> for ImageSource {
+    fn from(uri: String) -> Self {
+        Self::Uri(uri.into())
+    }
+}
+
 impl From<Arc<ImageData>> for ImageSource {
     fn from(value: Arc<ImageData>) -> Self {
         Self::Data(value)