docs(08-02): complete task delete UI plan

- Add 08-02-SUMMARY.md with delete button and smartDeleteTask outcomes
- Update STATE.md with progress, decisions, and session continuity
- Update ROADMAP.md: phase 08-task-delete 2/2 plans complete
- Mark DEL-01 and DEL-04 requirements complete

.planning/ROADMAP.md

@@ -33,7 +33,7 @@ See `milestones/v1.1-ROADMAP.md` for full phase details.
 
 **v1.2 Polish & Task Management (Phases 8-10):**
 
-- [ ] **Phase 8: Task Delete** - Add smart delete action to tasks — hard delete if never completed, soft delete (deactivate) if completed at least once
+- [x] **Phase 8: Task Delete** - Add smart delete action to tasks — hard delete if never completed, soft delete (deactivate) if completed at least once (completed 2026-03-18)
 - [ ] **Phase 9: Task Creation UX** - Rework the frequency picker from flat preset chips to an intuitive "Every N units" interface with quick-select shortcuts
 - [ ] **Phase 10: Dead Code Cleanup** - Remove orphaned v1.0 daily plan files and verify no regressions
 
@@ -43,7 +43,7 @@ See `milestones/v1.1-ROADMAP.md` for full phase details.
 **Goal**: Users can remove tasks they no longer need, with smart preservation of completion history for future statistics
 **Depends on**: Phase 7 (v1.1 shipped — calendar, history, and sorting all in place)
 **Requirements**: DEL-01, DEL-02, DEL-03, DEL-04
-**Plans:** 1/2 plans executed
+**Plans:** 2/2 plans complete
 Plans:
 - [ ] 08-01-PLAN.md — Data layer: isActive column, schema migration, DAO filters and methods
 - [ ] 08-02-PLAN.md — UI layer: delete button, confirmation dialog, smart delete provider
@@ -86,6 +86,6 @@ Plans:
 | 5. Calendar Strip | v1.1 | 2/2 | Complete | 2026-03-16 |
 | 6. Task History | v1.1 | 1/1 | Complete | 2026-03-16 |
 | 7. Task Sorting | v1.1 | 2/2 | Complete | 2026-03-16 |
-| 8. Task Delete | 1/2 | In Progress|  | - |
+| 8. Task Delete | 2/2 | Complete   | 2026-03-18 | - |
 | 9. Task Creation UX | v1.2 | - | Planned | - |
 | 10. Dead Code Cleanup | v1.2 | - | Planned | - |