chore: complete v1.2 milestone — archive roadmap, requirements, update retrospective

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

.planning/MILESTONES.md

@@ -1,5 +1,20 @@
 # Milestones
 
+## v1.2 Polish & Task Management (Shipped: 2026-04-03)
+
+**Phases completed:** 4 phases, 6 plans, 11 tasks
+
+**Key accomplishments:**
+
+- Drift schema v3 with isActive BoolColumn on Tasks, soft-delete DAO methods, and isActive=true filter applied to all 15 task queries across TasksDao, CalendarDao, DailyPlanDao, and RoomsDao
+- Red delete button with confirmation dialog in task edit form: hard-deletes unused tasks, soft-deletes tasks with completion history
+- 4 shortcut chips (Täglich/Wöchentlich/Alle 2 Wochen/Monatlich) + always-visible freeform picker replacing the 10-chip grid with hidden Custom mode
+- Deleted three orphaned v1.0 daily plan presentation files and stripped DailyPlanState from domain models, leaving TaskWithRoom intact for the calendar system — zero test/analysis regressions across all 144 tests.
+- Always-enabled task checkboxes across all calendar days plus today-based nextDueDate recalculation when completing tasks on non-due days
+- Interval-window pre-population via query-time virtual instances with period-completion filtering and 0.55 opacity muted visual distinction
+
+---
+
 ## v1.1 Calendar & Polish (Shipped: 2026-03-16)
 
 **Phases completed:** 3 phases, 5 plans, 11 tasks
@@ -7,6 +22,7 @@
 **Timeline:** 2 days (2026-03-15 to 2026-03-16)
 
 **Key accomplishments:**
+
 1. Horizontal 181-day calendar strip with German day cards, month boundaries, and floating Today button — replaces the stacked daily-plan HomeScreen
 2. Date-parameterized CalendarDao with reactive Drift streams for day tasks and overdue tasks
 3. Task completion history bottom sheet with per-task reverse-chronological log
@@ -24,6 +40,7 @@
 **Timeline:** 2 days (2026-03-15 to 2026-03-16)
 
 **Key accomplishments:**
+
 1. Flutter project with Drift SQLite, Riverpod 3 state management, ARB localization, and calm sage & stone Material 3 theme
 2. Full room CRUD with drag-and-drop reorder, icon picker, and cleanliness indicator per room card
 3. Task CRUD with 11 frequency presets + custom intervals, calendar-anchored scheduling with anchor memory, and auto-calculated next due dates
@@ -34,4 +51,3 @@
 **Archive:** See `milestones/v1.0-ROADMAP.md` and `milestones/v1.0-REQUIREMENTS.md`
 
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