Remove pro trial button from website account page

[devin-ai-integration]

Remove pro trial button from website account page

Summary

Removes the "Start Free Trial" button from the website's user account page (/app/account). Since pro trial and plan functionality is already implemented in the desktop application, this button is no longer needed on the website.

Changes:

• Removed canStartTrial and createTrialCheckoutSession imports
• Removed canTrialQuery and startTrialMutation hooks
• Simplified renderPlanButton to skip trial button logic

Free users will now see the "Upgrade to Pro" link directly instead of the trial button.

Review & Testing Checklist for Human

• Verify this is the correct button to remove (the "Start Free Trial" button that appeared for eligible free users)
• Test the account page renders correctly for free users (should show "Upgrade to Pro" link)
• Test the account page renders correctly for pro/trial users (should show "Manage Billing" button)

Notes

• Link to Devin run: https://app.devin.ai/sessions/5c3c3df416e9464585191e7ed6780d80
• Requested by: john@hyprnote.com (@ComputelessComputer)

[devin-ai-integration]

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