* feat(web-evals): remember last Roo model selection
* fix(web-evals): reset model selections on provider switch and fix lint warning
- Add useEffect to reset model selections when switching between providers
This prevents OpenRouter model IDs from persisting when switching to Roo,
which was causing Roo's stored selection to be overwritten with wrong IDs
- Remove unused 'executionMethod' from onSubmit dependency array to fix
react-hooks/exhaustive-deps warning
* fix(web-evals): add missing executionMethod to test cases
* fix(web-evals): harden localStorage + keep provider selections
