- Move validateProjectTimetable dispatch from VisTimelineGroup drag handlers
  to EditProjectTimetableModal componentDidUpdate
- Validation now triggers after checkForDecreasingValues cascade completes
- Pass attributeData directly to validateProjectTimetable action to avoid
  stale selector values
- Add guard to prevent duplicate validation requests
- Update saga to use passedAttributeData and compute diff with
  getChangedAttributeData

Fixes issue where validation was running before cascaded date values
were synced to the form, causing incorrect corrections.

- Remove unused validateProjectTimetable import from VisTimelineGroup
- Validation now triggers from EditProjectTimetableModal after cascade completes
- Saga uses passed attributeData and computes diff vs initial values
- Remove unused 'initialize' import from projectSaga

Ensures single PATCH request per date drag and proper handling of
cascaded date values before backend validation.

…rt, L and XL have reversed order in ehdotus phase: lautakunta first, nähtävilläolo last bug fix

…nd cascade runs for the new dates

…esilläolo is confirmed (#660)

Frontend changes:
- Updated generateConfirmedFields.js to include phase START boundary fields in confirmed_fields when the first esilläolo of that phase is confirmed
- Added phaseStartMap mapping phase names to their start boundary field identifiers
- Phase END boundaries are NOT protected (user can still add more esilläolos)

This ensures that when a user confirms the first esilläolo date of a phase, the phase start date becomes locked and won't be recalculated during save.

- Updated getChangedValues to return isAdd and isRemove separately
- Added validation trigger for group removal (isRemove) to recalculate phase boundaries
- This ensures phase dates are properly recalculated when esilläolo or lautakunta groups are deleted

- Add hasEsillaolo check to limit esillaoloOff logic to periaatteet/luonnos phases
- Fix adjustDeadlineData || operator to explicit undefined check
- Fix test key typo tarkistettuehdotusvaihe -> tarkistettu_ehdotusvaihe

- objectUtil.js: Replace hardcoded gaps (22, 5) with DB values

- timeUtil.js: Remove hardcoded gap overrides for maaraaika/nahtavilla
- Add projectVisibilityUtils.js for centralized visibility logic
- Add unit tests for objectUtil, timeUtil, projectReducer

- Extract runAndGetDaysDiff() helper for dateDifference tests
- Use test.each() for parameterized test cases
- Reduce dateDifference tests from ~150 to ~70 lines
- Fix projectReducer.test.js expected date (timezone handling)

…gainst just-updated value, Only push timeline values forward if there's an actual overlaps

… adjacent phases bug fix

… groups

Skip cascade for non-boundary deadlines across phases. Only phase boundaries cascade
from previous phase. Fixes oas_esillaolo_aineiston_maaraaika incorrectly using
periaatteet predecessor instead of oasvaihe_alkaa_pvm.

- Prevents stale dates from reappearing when group is re-added

… stale date overlap

…ctual previous index

…g initial distance with validation and user would need to move it fix

… change käynnistys dates