* fix: update cursor state handling in CodeEditor for read-only mode
* tests: add response pane update test for re-sent requests
* refactor: add data-testid attributes for improved testing in RequestBody and RequestBodyMode components; update locators and tests accordingly
* test: verify response status code is 200
* test: enhance response pane update tests to verify body editor content after request re-sent
* test: add data-testid for method selector and update locators for improved testability
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