drive-by: update links for pro banners
<!-- CURSOR_SUMMARY -->
---
> [!NOTE]
> Revamps ChatErrorBox with styled CTA buttons, UTM-tracked links,
broader error matching, and adds default help CTAs; updates Pro banners
to point to /pro URLs.
>
> - **Chat**:
> - **Error handling/UI**: Expands rate-limit matching to include
`"Provider returned error"` and appends default CTAs on generic errors.
> - **CTAs**: Replaces underlined links with styled buttons via
`ExternalLink` (supports `primary|secondary` variants and icons), and
adds upgrade/docs buttons across error states.
> - **Links**: Adds UTM parameters to Pro/Docs links; updates exceeded
budget CTA to `"Reload or upgrade your subscription"` with new
subscription URL.
> - **Pro Banners**:
> - Adjusts banner click-through URLs in `AiAccessBanner`,
`SmartContextBanner`, and `TurboBanner` to `https://www.dyad.sh/pro?...`
(removes `#ai`).
>
> <sup>Written by [Cursor
Bugbot](https://cursor.com/dashboard?tab=bugbot) for commit
2111954ac9a98dd66f5b3b9e628270ac19713a2d. This will update automatically
on new commits. Configure
[here](https://cursor.com/dashboard?tab=bugbot).</sup>
<!-- /CURSOR_SUMMARY -->
<!-- This is an auto-generated description by cubic. -->
## Summary by cubic
Added Dyad Pro access buttons in ProBanner to manage a subscription or
add an existing key. Show the manage button when Dyad Pro is enabled or
a user budget exists; otherwise show the setup button, both linking to
academy.dyad.sh.
<!-- End of auto-generated description by cubic. -->
<!-- This is an auto-generated description by cubic. -->
## Summary by cubic
Adds rotating Pro banners on the home page to promote Dyad Pro (AI
access, Smart Context savings, Turbo speed). Also tightens the home
layout and centers the setup headline.
- New Features
- Added ProBanner with three variants (AI Access, Smart Context, Turbo).
One shows at random and links to dyad.sh/pro with UTM tags.
- Banners are hidden when Pro is enabled or the user has a budget
(settings.enableDyadPro or userBudget).
- Added OpenAI, Google, and Anthropic logo assets for the AI Access
banner.
- Home updates: show 3 inspiration prompts (was 5), center and constrain
layout, and render ProBanner below content.
- SetupBanner heading is centered and slightly smaller (text-5xl).
<!-- End of auto-generated description by cubic. -->
