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> [!IMPORTANT]
> Improves email template migration by adding error handling, updating
default values, and adjusting styles across backend and dashboard
components.
>
> - **Behavior**:
> - In `route.tsx`, added check for non-existent projects, returning
zero templates converted.
> - Updated default values for email template rendering in `route.tsx`
and `page-client.tsx`.
> - **Rendering**:
> - In `convert.tsx`, changed `textAlign` default from 'center' to
'left'.
> - Set `padding` to '0' for `Container` elements in `convert.tsx`.
> - **UI**:
> - In `page-client.tsx`, added progress tracking and error handling for
template conversion.
> - Updated UI components to reflect conversion progress and results in
`page-client.tsx`.
>
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----
> [!IMPORTANT]
> This PR adds default email templates and themes, updates schema and
components, and introduces a migration tool for email templates.
>
> - **Behavior**:
> - Adds default email templates and themes, including `Email
Verification`, `Password Reset`, `Magic Link/OTP`, `Team Invitation`,
and `Sign In Invitation`.
> - Updates `render-email` and `send-email` routes to use `themes` and
`templates` instead of `themeList` and `templateList`.
> - Introduces migration tool for email templates in `page-client.tsx`
and `page.tsx`.
> - **Schema**:
> - Updates `branchConfigSchema` and `organizationConfigDefaults` to use
`selectedThemeId`, `themes`, and `templates`.
> - Adds `templateThemeIdSchema` to `schema-fields.ts`.
> - **Components**:
> - Replaces `ThemePreview` with `EmailPreview` in various components.
> - Adds `ResizableContainer` for email preview resizing.
> - **Tests**:
> - Updates e2e tests for email themes and templates to reflect new
schema and behavior.
> - **Misc**:
> - Renames `themeList` to `themes` and `templateList` to `templates` in
multiple files.
> - Adds new email template metadata in `utils.tsx`.
>
> <sup>This description was created by </sup>[<img alt="Ellipsis"
src="https://img.shields.io/badge/Ellipsis-blue?color=175173">](https://www.ellipsis.dev?ref=stack-auth%2Fstack-auth&utm_source=github&utm_medium=referral)<sup>
for 49554ca03d. You can
[customize](https://app.ellipsis.dev/stack-auth/settings/summaries) this
summary. It will automatically update as commits are pushed.</sup>
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