Some refactoring separated from #8825 for easier review.
# Important Notes
**ID types**
The new *synchronization IDs* will replace `ExprId` for `Ast` references in frontend logic. `ExprId` (now called `ExternalId`) is now used only for module serialization and engine communication. The graph database will maintain an index that is used to translate at the boundaries. For now, this translation is implemented as a type cast, as the IDs have the same values until the next PR.
- `AstId`: Identifies an `Ast` node.
- `NodeId`: A subtype of `AstId`.
- `ExternalId`: UUID used for serialization and engine communication.
**Other changes**:
- Immediate validation of `Owned` usage.
- Eliminate `Ast.RawCode`.
- Prepare to remove `IdMap` from yjsModel.
Related to https://github.com/enso-org/enso/issues/8518
These tests already caught one regression in nav breadcrumbs: https://github.com/enso-org/enso/issues/8756
It also provides API for mocking expression updates for arbitrary nodes on the screen. The implementation is a bit convoluted and includes setting a callback on `window`, but it looks like the only possible solution given our architecture and playwright restrictions.
Implements first two points of #8745
1. The fix for drop-down was simple, just stop click propagation
2. The fix for connections was much more complicated. It turned out, that it's about keeping track of hovered ports; when picking an option in WidgetSelection makes the drop-down disappear - but that won't emit `pointerleave` event, so the port was still deemed hovered. Changed the mechanism for tracking hovered port to more "centralized" one.
- Closes https://github.com/enso-org/cloud-v2/issues/804
- The GUI should now properly configure deep links and auth settings, among other things, because the logic has been ported over from the GUI1 runner.
- The porting was very basic; it may be a good idea to refactor it later, but that is out of scope of this PR.
- This also means that `runner/` should be safe to remove along with GUI1 in the future, as all code relevant to GUI2 now resides in `app/gui2/runner`.
# Important Notes
- The built `ide2` has been tested on Windows, but should also be tested on macOS.
- Should *also* be fully tested in `npm run dev`.
- The module is edited by changing the AST, not the text representation.
- `IdMap`s no longer need to be maintained in parallel with the module content; they are snapshots produced as needed from the ASTs.
- Simplistic synchronization is in place until #8237: Edits are never merged; if two edits are started from the same state, one will be overwritten.
- Closes#8072
- Implement handlers for the corresponding buttons on the circular menu
- Add missing icons and styles
- Add functionality to match and extract ASTs
# Important Notes
None
