'

* add lab2 metric

* add legacy metric

* unify metrics logic

* feat: add navigation for previous and next lessons with disabled states

* fix: handle edge cases for lesson navigation when lessons array is empty or undefined

…levels in a lesson are CFU (#69977)

* feat: add CFU levels fetching functionality to StudentSnapshot component

* test: add comprehensive tests for cfu_levels endpoint in StudentSnapshotsController

* test: refactor CFU levels creation in StudentSnapshotsController tests

- Added TanStack Router plugin to Vite configuration for enhanced routing capabilities.
- Added a stub of the `/projects/[labType]/[channelId]/edit` route
- Implemented `@/` alias for the `src` root

feat(router): integrate TanStack Router

This commit introduces the initial implementation of Music Lab.

It includes a dedicated frontend package, lazy-loaded entrypoints,
and initial integration with lab infrastructure. The changes ensure
that the Music Lab is modular and code-split.

The commit also includes updates to the workspace configuration, routing,
and TypeScript settings to support the new Music Lab package.

- **Added** `@code-dot-org/music-lab` package with initial React-based implementation.
- **Updated** `package.json` and `yarn.lock` to include the new Music Lab package and dependencies.
- **Created** `AVAILABLE_LABS` configuration to register the Music Lab.
- **Implemented** lazy-loaded entrypoints for labs in `getLabEntrypoint.ts`.
- **Added** type definitions and type guard for labs in `lab.ts`.
- **Updated** routing to support `/projects/$labType/$channelId/edit` for Music Lab.
- **Configured** Vite, ESLint, and TypeScript for the Music Lab package.
- **Added** `.gitignore` and `.lintstagedrc.mjs` for the Music Lab package.
- **Created** basic `App.tsx` and `main.tsx` for the Music Lab UI.

Merge staging into staging-next

feat(music): add initial Music Lab implementation

* Add query limit for inactive users

* WIP

* Use user account deletion limit in inactive deleter

* Use user account deletion limit in inactive deleter

* Add break statements

* Reuse limit argument

* Add limit to query itself in order to prevent timeouts

* Trigger build / empty commit

* Refactor Inactive Teacher Deletion Warning Emailer

* Update dashboard/lib/inactive_teacher_deletion_warning_emailer.rb

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

* Update dashboard/lib/inactive_teacher_deletion_warning_emailer.rb

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

* Refactor class names

* Use correct class name

* Add error handling and tracking

* Add rescue to ApplicationJob

* Trigger build / empty commit

---------

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

…or selected (#70008)

* move focus to aitutor vh panel when tab selected

* add helper function

* move focus to chat msg editor

Merge staging-next into staging after restricted deploy period

* fix broken pipeline

* test fix for ui test

Music: credit