Richer player profiles, launcher command guide, integration docs

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01DjMbLQujBHunCCu5GpsHaT

launcher/src-tauri/src/commands.rs

@@ -1129,6 +1129,7 @@ pub async fn update_my_profile(
     banner_url: Option<String>,
     custom_badge: Option<String>,
     featured_achievement_id: Option<String>,
+    accent_color: Option<String>,
 ) -> Res<UserProfileView> {
     let req = account_api(&state, reqwest::Method::PUT, "/profiles/me").await?;
     let resp = req
@@ -1137,6 +1138,7 @@ pub async fn update_my_profile(
             "banner_url": banner_url,
             "custom_badge": custom_badge,
             "featured_achievement_id": featured_achievement_id,
+            "accent_color": accent_color,
         }))
         .send()
         .await