Fix dialog dismiss parsing in CLI

[bytes032]

What’s going on

The CLI help and README list dialog dismiss as a valid subcommand, but the dialog parser only handles accept. Any other value (including dismiss) falls into UnknownSubcommand and the CLI exits with an error.

• README docs: https://github.com/vercel-labs/agent-browser/blob/main/README.md#L209-L214
• CLI parser today: https://github.com/vercel-labs/agent-browser/blob/main/cli/src/commands.rs#L701-L719

Fix

Add a dismiss branch to the dialog parser to emit the correct command JSON:

{ "id": id, "action": "dialog", "response": "dismiss" }

This matches the existing protocol and runtime support:

• Dialog schema accepts dismiss: https://github.com/vercel-labs/agent-browser/blob/main/src/protocol.ts#L198-L202
• Dialog command type: https://github.com/vercel-labs/agent-browser/blob/main/src/types.ts#L177-L181
• Runtime handler supports dismiss: https://github.com/vercel-labs/agent-browser/blob/main/src/browser.ts#L246-L262

Why this is safe

It only changes CLI parsing for dialog and doesn’t touch the protocol or Playwright behavior.

Testing

Not run (no CLI tests in repo).

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