fix(webapp): Cancel button in API key regeneration dialog now closes the modal

The Cancel button was missing an onClick handler to close the modal dialog.
This caused confusing behavior where clicking Cancel would not dismiss the dialog.
Also added type="button" to prevent form submission since the button is inside a form.

Slack thread: https://triggerdotdev.slack.com/archives/C04CR1HUWBV/p1768323370953509

Author: claude

apps/webapp/app/components/environments/RegenerateApiKeyModal.tsx

@@ -94,7 +94,11 @@ const RegenerateApiKeyModalContent = ({ id, randomWord, title, closeModal }: Mod
                 Regenerate
               </Button>
             }
-            cancelButton={<Button variant={"tertiary/medium"}>Cancel</Button>}
+            cancelButton={
+              <Button variant={"tertiary/medium"} type="button" onClick={closeModal}>
+                Cancel
+              </Button>
+            }
           />
         </Fieldset>
       </fetcher.Form>