Fixes#10668Fixes#8484
Summary of changes:
* `gui2` and `dashboard` are merged to `gui` directory. Various configs were merged (package.json, playwrigth, TS...). The src and e2e directories are split to `dashboard` and `project-view` for now.
* E2E tests run two servers on different ports. The tests are organized in projects. This is also to be changed soon, as we plan to [use better mocking in GUI/ProjectView](#9726)
* ESlint configs were merged to central `eslint.config.mjs`, and that file was moved to repository root. We kept the dashboard lints, but they can be relaxed. The dashboard code was changed to meet GUI lints.
* Also, the versions of linter plugins were bumped, and code fixed.
* The ide-desktop/client no longer has `dashboard` dependency - the only type used there was moved to common package.
* `common` package moved to `app`.
Fixes#9357
The main issue was the spread operator using at the wrong place in functions overriding spacing of nodes. The bug, to be visible, required copying AST node before, because during copying `whitespace` field was explicitly set to undefined (in opposite to being unset), what in turns make spread overriding the value set by those functions.
# Important Notes
* To enable VSCode debugging, added a workspace for vitest and fix any relative path to be working-dir independent.
