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<!-- This is an auto-generated description by cubic. -->
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## Summary by cubic
Restricts Dyad Pro trial users to the Auto model and adds an upgrade
call-to-action. Non-trial users see the full set of cloud and local
models as before.

- **New Features**
- Added useTrialModelRestriction hook to detect trial status and
auto-switch to the Auto model.
- Updated ModelPicker to show an upgrade banner and only the Auto model
for trial users; hides cloud and local models.
  - Extended IPC user budget response and schema to include isTrial.
  - Updated TitleBar to show "Pro Trial" when applicable.

<sup>Written for commit 714d2c704f155c004240e563e0e850ace0c9f5f8.
Summary will update on new commits.</sup>

<!-- End of auto-generated description by cubic. -->

<!-- CURSOR_SUMMARY -->
---

> [!NOTE]
> **Medium Risk**
> Introduces trial-based gating in the model picker and an effect that
can automatically change a user’s selected model, which could impact UX
if trial detection is wrong or delayed.
> 
> **Overview**
> **Trial enforcement for model selection.** Adds
`useTrialModelRestriction` to derive `isTrial` from `get-user-budget`
and auto-switch trial users to the `auto` model.
> 
> **Model picker gating + upgrade CTA.** Updates `ModelPicker` to show
an upgrade banner (opening the subscription URL via
`ipc.system.openExternalUrl`) and to hide all cloud/local model choices
for trial users, leaving only the `auto` option.
> 
> **IPC/schema update.** Extends user budget IPC types and
`pro_handlers` API parsing to include an `isTrial` flag (defaulting to
`false` when absent).
> 
> <sup>Written by [Cursor
Bugbot](https://cursor.com/dashboard?tab=bugbot) for commit
7928275e3b1a7d32ec792609968d9d5786ee8582. This will update automatically
on new commits. Configure
[here](https://cursor.com/dashboard?tab=bugbot).</sup>
<!-- /CURSOR_SUMMARY -->