Danny White 512201dcd0 chore(ui): remove the Classic Dark theme (#50387)
## What kind of change does this PR introduce?

Chore.

## What is the current behaviour?

Classic Dark remains available across the shared theme library and
several apps. Studio now supports System, Dark, and Light as its theme
modes, but still carries compatibility paths for Classic Dark.

## What is the new behaviour?

- Removes Classic Dark from shared theme options, application commands,
stylesheets, previews, examples, and replay handling.
- Deletes the Classic Dark and faux Classic Dark stylesheets.
- Removes the now-unused Classic Dark branches from Studio theme colour
controls.
- Migrates `classic-dark` to `dark` so first rendered frame renders Dark
(not Light)

| After |
| --- |
| <img width="1458" height="1778" alt="CleanShot 2026-09-18 at 11 07
40@2x"
src="https://github.com/user-attachments/assets/679bf87f-a3c1-4599-ad2f-292d98d0b856"
/> |

## To test

1. In Studio, open Account Preferences → Appearance. Confirm the
available themes are System, Dark, and Light, and that theme colour
controls still work in each resolved mode.
2. Set the `theme` local storage value to `classic-dark`, then reload
Studio. Confirm it renders as Dark immediately and the stored value
becomes `dark`.
3. Open the theme switcher in Design System, Learn, and UI Library.
Confirm Classic Dark is no longer available and Light, Dark, and System
still apply correctly.


<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->

## Summary by CodeRabbit

* **Changes**
* Removed the Classic Dark theme option from theme menus and settings
across the application.
* Classic Dark selections are automatically migrated to the standard
Dark theme.
* Updated theme documentation and demonstrations to list only System,
Light, and Dark.
* Removed Classic Dark styling and preview support; existing Dark,
Light, and System themes remain available.

<!-- end of auto-generated comment: release notes by coderabbit.ai -->
2026-09-21 10:53:14 +10:00
2026-09-18 10:38:49 +10:00
2025-06-17 11:08:46 +02:00
2024-01-10 13:34:41 +01:00
…
2026-09-18 10:38:49 +10:00

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