<!-- CURSOR_SUMMARY -->
> [!NOTE]
> **Upgrade default template and migrate Calendar**
> 
> - Bumps dependencies in template/package manifests:
`react`/`react-dom` -> `^19.2.3`, `react-day-picker` -> `^9.13.0`, and
`@types/react`/`@types/react-dom` -> `^19.x`
> - Migrates `Calendar` (`src/components/ui/calendar.tsx`) to DayPicker
v9: updates `classNames` keys (e.g., `month_caption`,
`button_previous/next`, `month_grid`, `weekday/week`, `day_button`,
`selected`, `range_end`, `today`, `outside`, `disabled`, `range_middle`,
`hidden`) and replaces `IconLeft/IconRight` with `components.Chevron`
> 
> **Tests and snapshots**
> 
> - Rebaselines e2e snapshots reflecting dependency/UI changes
> - Adds `await this.waitForChatCompletion()` in `snapshotServerDump` to
stabilize chat/server dump snapshots
> 
> <sup>Written by [Cursor
Bugbot](https://cursor.com/dashboard?tab=bugbot) for commit
3bc152b48e32e9746bf9e08fe7795505608a1c6d. 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
Upgrade the default scaffold to React 19 and bump react-day-picker to
v9, updating the Calendar component to the new DayPicker v9 API.
Rebaselined e2e snapshots and added a wait in tests to stabilize chat
output.

- **Dependencies**
- Updated scaffold/package.json: react and react-dom -> ^19.2.3;
react-day-picker -> ^9.13.0; @types/react and @types/react-dom -> ^19.x.
- Updated scaffold/pnpm-lock.yaml; refreshed root/test lockfiles and
peer flags.
- Adjusted e2e snapshots for dependency/version changes and minor UI
text ordering.

- **Migration**
  - Run npm ci and rebuild the template. No app code changes required.

<sup>Written for commit 3bc152b48e32e9746bf9e08fe7795505608a1c6d.
Summary will update on new commits.</sup>

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