LoadTest

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- Added professional load testing UI with cleaner default layout.
- Added Auth, Headers, Body, Cookies, and Assertions editors.
- Added duration, ramp-up, and constant RPS load modes.
- Added per-step metrics, live progress, charts, and better reports.
- Added TXT/CSV/JSON report export.
- Added run history and improved import/share URL handling.
- Advanced options are now collapsible for a cleaner pro experience.