feat(browser): add optional computer-use sidecar backend (#335)

src/cost/tracker.rs

@@ -1,5 +1,5 @@
 use super::types::{BudgetCheck, CostRecord, CostSummary, ModelStats, TokenUsage, UsagePeriod};
-use crate::config::CostConfig;
+use crate::config::schema::CostConfig;
 use anyhow::{anyhow, Context, Result};
 use chrono::{Datelike, NaiveDate, Utc};
 use std::collections::HashMap;