feat: add profile avatar selection and enhance sidebar UI with icons

backend/src/handlers/users.rs

@@ -35,6 +35,7 @@ pub struct UpdateUserRequest {
     pub smoking: Option<bool>,
     pub alcohol: Option<bool>,
     pub diet_id: Option<i32>,
+    pub avatar_url: Option<String>,
 }
 
 /// Response for a user.
@@ -50,6 +51,7 @@ pub struct UserResponse {
     pub smoking: Option<bool>,
     pub alcohol: Option<bool>,
     pub diet: Option<String>,
+    pub avatar_url: Option<String>,
     pub created_at: String,
 }
 
@@ -95,6 +97,7 @@ pub async fn list_users(
             smoking: u.smoking,
             alcohol: u.alcohol,
             diet: u.diet_id.and_then(|id| diet_map.get(&id).cloned()),
+            avatar_url: u.avatar_url,
             created_at: u.created_at.to_string(),
         })
         .collect();
@@ -141,6 +144,7 @@ pub async fn get_user(
         smoking: u.smoking,
         alcohol: u.alcohol,
         diet: diet_name,
+        avatar_url: u.avatar_url,
         created_at: u.created_at.to_string(),
     }))
 }
@@ -188,6 +192,7 @@ pub async fn create_user(
         smoking: Set(req.smoking),
         alcohol: Set(req.alcohol),
         diet_id: Set(req.diet_id),
+        avatar_url: Set(None), // Default to None on create for now, unless we want to support it in CreateUserRequest
         created_at: Set(now),
         updated_at: Set(now),
         ..Default::default()
@@ -223,6 +228,7 @@ pub async fn create_user(
         smoking: inserted.smoking,
         alcohol: inserted.alcohol,
         diet: diet_name,
+        avatar_url: inserted.avatar_url,
         created_at: inserted.created_at.to_string(),
     }))
 }
@@ -270,6 +276,9 @@ pub async fn update_user(
     if req.diet_id.is_some() {
         active.diet_id = Set(req.diet_id);
     }
+    if req.avatar_url.is_some() {
+        active.avatar_url = Set(req.avatar_url);
+    }
     active.updated_at = Set(now);
 
     let updated = active
@@ -307,6 +316,7 @@ pub async fn update_user(
         smoking: updated.smoking,
         alcohol: updated.alcohol,
         diet: diet_name,
+        avatar_url: updated.avatar_url,
         created_at: updated.created_at.to_string(),
     }))
 }

backend/src/models/user/user.rs

@@ -41,6 +41,9 @@ pub struct Model {
     /// Foreign key to diet types
     pub diet_id: Option<i32>,
 
+    /// URL to profile avatar icon
+    pub avatar_url: Option<String>,
+
     pub created_at: DateTime,
     pub updated_at: DateTime,
 }