fix: align Claude MCP path for custom config dirs (#3431)

* fix claude mcp path for custom config dir

* fix claude mcp custom profile isolation

* fix claude mcp override path edges

* fix ci test isolation

src-tauri/src/database/dao/usage_rollup.rs

@@ -493,8 +493,10 @@ mod tests {
 
         {
             let conn = crate::database::lock_conn!(db.conn);
-            let date_str = chrono::DateTime::from_timestamp(old_ts, 0)
-                .unwrap()
+            let date_str = Local
+                .timestamp_opt(old_ts, 0)
+                .single()
+                .expect("old timestamp should be a valid local datetime")
                 .format("%Y-%m-%d")
                 .to_string();
             conn.execute(