Regression: DateFilter state management issues from #66 have returned

[ryanrozich]

Bug Description

This is a regression of issue #66 which was previously fixed. The DateFilter component is again experiencing state management issues that cause unexpected behavior when switching between modes and filter types.

Steps to Reproduce

Issue 1: Filter type resets to 'equals'

1. Open DateFilter in relative mode
2. Enter a value (e.g., 'today')
3. Switch filter type to 'before'
4. Click Apply
5. Result: Filter type immediately resets back to 'equals'
6. Try changing to 'before' or 'inRange' again
7. Result: Keeps reverting to 'equals'

Issue 2: Cannot switch from relative to absolute mode

1. Open DateFilter in relative mode with 'today' entered
2. Try to toggle to absolute date mode
3. Result: Mode switches back to relative automatically
4. Try to delete 'today' from the input
5. Result: 'today' reappears

Expected Behavior

• Filter type selections (equals, before, after, inRange) should persist when applied
• Mode switching between relative and absolute should work without reverting
• User input should be deletable

Additional Context

• This was previously fixed in the PR that closed DateFilter: State resets and mode switching issues #66
• The regression may have been introduced during merge conflicts or subsequent changes
• Affects both column filters and sidebar filters

Environment

• ag-grid-react-components version: v0.2.0-rc1
• Branch: release/v0.2.0-rc2

[ryanrozich]

This issue has been resolved by PR #102 (Release v0.2.0-rc3). The DateFilter component has been completely rewritten using the headless UI pattern, which eliminated all state management issues including the infinite loops.

The new architecture properly manages state synchronization between the component and AG Grid, preventing the issues that occurred in the previous implementation.

See HEADLESS_RC3_MIGRATION_PLAN.md for implementation details.