fix: wait for stop button visibility before clicking in E2E test #221

Job	Run time
Lint commit messages	52s
Lint & format-check changed JS files	51s
Security audit	14s
Build (Node 20.x)	56s
Cypress E2E	2m 34s
Build (Node 22.x)	51s
Jest tests & coverage	1m 12s
	7m 30s

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