fix(embed): correct link thumbnail placement and harden unfurl parsing (#1672)

Cargo.lock

@@ -1624,6 +1624,15 @@ dependencies = [
  "zeroize",
 ]
 
+[[package]]
+name = "encoding_rs"
+version = "0.8.35"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "75030f3c4f45dafd7586dd6780965a8c7e8e285a5ecb86713e63a79c5b2766f3"
+dependencies = [
+ "cfg-if",
+]
+
 [[package]]
 name = "entities"
 version = "1.0.1"
@@ -1931,6 +1940,7 @@ dependencies = [
  "anyhow",
  "base64",
  "chrono",
+ "encoding_rs",
  "entities",
  "fluxer-svc",
  "hmac 0.13.0",