Fix gen:mail --markdown type error and accept HtmlString content in Mailer

[Copilot]

gen:mail --markdown could return a boolean from getView() and crash during template path generation. Separately, Content(htmlString: ...) flowed into Mailer::addContent() as HtmlString and failed strict parameter typing.

• Markdown mail generator correctness

  • Corrected stub selection for --markdown so markdown generation uses markdown-mail.stub.
  • Updated getView() to always derive a string view name when the option is a boolean flag.
  • Aligned buildClass() markdown branch check with flag semantics.

• HtmlString support through mail rendering pipeline

  • Expanded Mailer type signatures in parseView(), addContent(), and renderView() to accept HtmlString / Htmlable.
  • Preserved existing rendering behavior while allowing pre-rendered HTML payloads from Content(htmlString: ...).

Example (now accepted without type error):

public function content(): Content
{
    return new Content(
        htmlString: '<h1>Hello</h1><p>Mail body</p>',
    );
}

• Fixes 【BUG】生成markdown命令出错，另外也不支持htmlString #3

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