* [AI] feat: add balance forecast backend
* [AI] feat: add balance forecast report UI
* [AI] feat: gate balance forecast behind an experimental flag
* [AI] Include account-less schedules in balance forecast via explicit flag
- Add includeAccountlessSchedules to forecast/generate and normalize
schedules without an account into FORECAST_UNASSIGNED_ACCOUNT_ID
- When enabled, append synthetic bucket and rule stub; skip transfer legs
for unassigned schedules
- Balance forecast UI sets the flag when widget meta has no account filter
- Add loot-core tests for include vs exclude behavior
* [AI] Improve balance forecast chart refresh UX
Keep forecast charts stable during refetches and let the Y-axis scale to forecast data so balance changes remain visible.
* [AI] Document balance forecast report
Add experimental user documentation and navigation links for the new balance forecast report.
* [AI] Link balance forecast experimental flag to feedback issue #7669
* docs: add PR release notes
* [AI] chore: rerun CI