Show quick email verification widget on order page

[Copilot]

Email verification is now required to complete orders, but users previously had to navigate to account settings to set/verify their email. This adds an inline email verification prompt directly on the order page.

Changes

New component: src/components/email-verification.tsx

• Renders nothing if the user's email is already verified
• When unverified, shows a compact banner with an email input (pre-filled if email already set) and a "Send Verification" button
• Calls updateAccount on submit to save the email and trigger a server-side verification email
• Switches to a success message after submission; surfaces errors inline
• Cleans up async state updates on unmount via a mounted flag

Order page: src/pages/order/vm.tsx

• Renders <EmailVerification /> at the top of the logged-in order flow, before OS/SSH key selection

Original prompt

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This section details on the original issue you should resolve

<issue_title>Show quick email verification on order page</issue_title>
<issue_description>Now that email verification is required, we should show a quick input for email address on the order page so users can quickly verify their email address during the other process</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes Show quick email verification on order page #6

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