[QA] This issue is a duplicate of TRCKR-649. The test file tests/e2e/test_delete_milestone_via_detail_modal.py was already implemented and merged to master in commit 9c7b5e9 on Dec 23, 2025. The TRCKR-682 branch has no new commits or changes compared to master. All 8 test cases for milestone deletion via detail modal already exist and have valid syntax. No additional work is required. See /tmp/qa-TRCKR-682.md for detailed QA report.

## Investigation Complete This E2E test was already implemented and merged to master as part of **TRCKR-649** (commit 9c7b5e9). ### Test File `tests/e2e/test_delete_milestone_via_detail_modal.py` ### Test Coverage (8 tests) 1. `test_delete_milestone_shows_confirmation_dialog` - Verifies confirmation dialog appears 2. `test_delete_milestone_confirmation_message_text` - Verifies exact confirmation message 3. `test_delete_milestone_removes_row_from_table` - Verifies row removal from table 4. `test_delete_milestone_removes_from_table_and_database` - Verifies both UI and API deletion 5. `test_delete_milestone_cancel_preserves_milestone` - Verifies cancel preserves data 6. `test_delete_milestone_keeps_other_milestones_visible` - Verifies other milestones unaffected 7. `test_delete_multiple_milestones_sequentially` - Verifies sequential deletions 8. `test_delete_milestone_with_project_association` - Verifies deletion with project links ### Verification - Test file exists on master branch - Syntax verified: python -m py_compile passes - 8 comprehensive test cases covering the full deletion workflow This issue is a duplicate of TRCKR-649 and can be closed.