Add circular thumbnail creation for Map view

src/data/mod.rs

@@ -186,6 +186,8 @@ pub struct ThumbnailRequest {
     #[serde(default)]
     #[allow(dead_code)] // Part of API contract, may be used in future
     pub(crate) format: Option<ThumbnailFormat>,
+    #[serde(default)]
+    pub(crate) shape: Option<ThumbnailShape>,
 }
 
 #[derive(Debug, Deserialize, PartialEq)]
@@ -196,6 +198,14 @@ pub enum ThumbnailFormat {
     Image,
 }
 
+#[derive(Debug, Deserialize, PartialEq)]
+pub enum ThumbnailShape {
+    #[serde(rename = "circle")]
+    Circle,
+    #[serde(rename = "square")]
+    Square,
+}
+
 #[derive(Deserialize)]
 pub struct LoginRequest {
     pub username: String,