Add passcode, name, and join steps to Zoom workflow

[EugeneVuong]

Summary

• Adds wait + passcode/display name input + final join click to the Zoom web client workflow
• Uses iframe-piercing selectors (iframe#webclient >>> ...) for the post-meeting-ID screen
• Final wait uses {{wait_seconds}} so the bot stays in the meeting/lobby for the configured duration

Test plan

• Run the workflow against a real Zoom meeting that requires a passcode and display name
• Verify the bot enters the meeting / waiting room and stays for wait_seconds

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