Changes

Add `statementId` to student grouping navigation routes and update associated ViewModels to track and pass xAPI statement identifiers.

Specific changes:
* Add optional `statementId` parameter to the `StudentGroupingDetail` route.
* Update `ClazzDetailViewModel` to extract `statementId` from xAPI statements and pass it when navigating to group details.
* Update `StudentGroupingEditViewModel` to store the `statementId` from existing groups and include it in navigation commands.
* Include `statementId` in `GroupDisplayData` and UI states for better tracking of group-related xAPI statements.
* Add debug logging for group and statement identifiers across Clazz Detail, Student Grouping Detail, and Edit screens.
 (commit: 30b418c)

Implement xAPI statement voiding when updating a student group in `StudentGroupingEditViewModel`. When editing an existing group, a voiding statement is sent for the old statement ID before posting the updated group information as a new statement.
 (commit: fe27bd6)

Remove debug logging from `ClazzDetailViewModel` and `StudentGroupingEditViewModel`.
 (commit: 30117f6)

Update `ClazzDetailViewModel`, `StudentGroupingDetailViewModel`, and `StudentGroupingEditViewModel` to filter out voided xAPI statements when retrieving groups.
 (commit: 11a551b)

Update `ClazzDetailViewModel`, `StudentGroupingDetailViewModel`, and `StudentGroupingEditViewModel` to filter out voided xAPI statements when retrieving groups.
 (commit: e2640a3)

Simplify xAPI statement retrieval by using timestamps to identify the latest group state and refactor `StudentGroupingDetailViewModel` to inject `NavResultReturner` via the constructor.
 (commit: 3bc78c6)

Refactor `ClazzDetailViewModel.kt` to improve code formatting and update enrollment removal logic to mark records as `TO_BE_DELETED` if they were created on the current day.
 (commit: 55392bf)

Clean up whitespace in `StudentGroupingDetailViewModel.kt`.
 (commit: 7089f57)

Implement xAPI group deletion and refine the student grouping data model.

- Implement `onConfirmDeleteGroup` in `StudentGroupingDetailViewModel` using xAPI `VOIDED` statements.
- Update `StudentGroupingDetailUiState` to include the selected account and helper properties for person name and ID.
- Remove unused `metadata` field and related `GROUP_IDS` constant from the `Clazz` model and `ClassEntity` database schema.
- Fix a bug in `XapiStatementEntityDao` and `XapiStatementEntityJsonDao` where `statementVerbId` was incorrectly referenced as `statementVerbUid`.
- Clean up UI code in `StudentGroupingEditScreen` and `StudentGroupingDetailScreen`, including improved paging keys and formatting.
- Remove the unused `findGroupByAccountNameAsync` from `XapiActorDao`.
- Define `SAVED` and `VOIDED` display constants in `XapiVerb`.
 (commit: 5288f96)

Relocate the `isIdentified` property within `XapiGroup.kt` and remove trailing whitespace.
 (commit: 1c842b5)

Update `StudentGroupingDetailViewModel` and `StudentGroupingEditViewModel` to support direct xAPI statement lookups and explicit statement ID generation.

- Update `StudentGroupingDetailViewModel` to query xAPI statements by `statementId` if available in the route, falling back to verb and activity filters.
- Modify `StudentGroupingEditViewModel` to pre-generate a `Uuid` for new xAPI statements and pass it to the `StudentGroupingDetail` navigation route.
 (commit: c284dc3)

Refactor xAPI statement retrieval and fix database DAO inconsistencies.

- Simplify `loadGroupDetail` in `StudentGroupingDetailViewModel` to query by verb and activity only, removing direct lookup by statement ID.
- Fix a bug in `XapiStatementEntityDao` and `XapiStatementEntityJsonDao` where `statementVerbId` was incorrectly used instead of `statementVerbUid`.
- Clean up indentation and code formatting in `StudentGroupingEditViewModel`.
- In `StudentGroupingEditViewModel`, remove manual statement ID generation and rely on the model-generated ID for navigation.
- Remove unused `Uuid` import in `StudentGroupingDetailViewModel`.
 (commit: cdd5bc0)

Clean up code formatting and simplify comments.

- Remove unnecessary empty line in `StudentGroupingDetailScreen.kt`.
- Simplify the comment explaining the xAPI statement sorting logic in `ClazzDetailViewModel.kt`.
 (commit: aca36a8)