docs(11-02): complete pre-populate-recurring-tasks plan — interval-window pre-population with muted UI

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

.planning/REQUIREMENTS.md

@@ -29,9 +29,9 @@ Requirements for milestone v1.2 Polish & Task Management. Each maps to roadmap p
 
 - [x] **TM-01**: User can check off (complete) a task on any calendar day — checkboxes are never disabled for future dates
 - [x] **TM-02**: When completing a task on a non-due day, nextDueDate is recalculated from today (not from the original due date)
-- [ ] **TM-03**: Recurring tasks are pre-populated on all applicable days within their current interval window (e.g., a weekly task shows every day in the 7-day window leading up to its due date)
+- [x] **TM-03**: Recurring tasks are pre-populated on all applicable days within their current interval window (e.g., a weekly task shows every day in the 7-day window leading up to its due date)
-- [ ] **TM-04**: Pre-populated tasks that have already been completed in the current interval period are hidden from the calendar view
+- [x] **TM-04**: Pre-populated tasks that have already been completed in the current interval period are hidden from the calendar view
-- [ ] **TM-05**: Pre-populated tasks not yet due have a muted visual distinction (reduced opacity) compared to due-today and overdue tasks
+- [x] **TM-05**: Pre-populated tasks not yet due have a muted visual distinction (reduced opacity) compared to due-today and overdue tasks
 
 ## Future Requirements
 

.planning/ROADMAP.md

@@ -36,7 +36,7 @@ See `milestones/v1.1-ROADMAP.md` for full phase details.
 - [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)
 - [x] **Phase 9: Task Creation UX** - Rework the frequency picker from flat preset chips to an intuitive "Every N units" interface with quick-select shortcuts (completed 2026-03-18)
 - [x] **Phase 10: Dead Code Cleanup** - Remove orphaned v1.0 daily plan files and verify no regressions (completed 2026-03-19)
-- [ ] **Phase 11: Tasks Management** - Allow task checking anytime and pre-populate recurring tasks within their interval window
+- [x] **Phase 11: Tasks Management** - Allow task checking anytime and pre-populate recurring tasks within their interval window (completed 2026-04-03)
 
 ## Phase Details
 
@@ -86,10 +86,10 @@ Plans:
 **Goal**: Users can complete tasks on any day regardless of schedule, and recurring tasks appear on all applicable days within their interval window — making the app feel like a consistent checklist rather than a rigid scheduler
 **Depends on**: Phase 10
 **Requirements**: TM-01, TM-02, TM-03, TM-04, TM-05
-**Plans:** 1/2 plans executed
+**Plans:** 2/2 plans complete
 Plans:
 - [x] 11-01-PLAN.md — Anytime completion: remove checkbox restrictions, recalculate nextDueDate from today on non-due-day completion
-- [ ] 11-02-PLAN.md — Pre-population: virtual task instances in provider layer, period-completion filtering, muted visual styling
+- [x] 11-02-PLAN.md — Pre-population: virtual task instances in provider layer, period-completion filtering, muted visual styling
 **Success Criteria** (what must be TRUE):
   1. Checkboxes are always enabled on all calendar days (past, today, future) and in room task lists
   2. Completing a task on a non-due day recalculates nextDueDate from today, not the original due date
@@ -114,4 +114,4 @@ Plans:
 | 8. Task Delete | v1.2 | 2/2 | Complete | 2026-03-18 |
 | 9. Task Creation UX | v1.2 | 1/1 | Complete | 2026-03-18 |
 | 10. Dead Code Cleanup | v1.2 | 1/1 | Complete | 2026-03-19 |
-| 11. Tasks Management | v1.2 | 1/2 | In Progress|  |
+| 11. Tasks Management | v1.2 | 2/2 | Complete   | 2026-04-03 |

.planning/STATE.md

@@ -2,14 +2,14 @@
 gsd_state_version: 1.0
 milestone: v1.0
 milestone_name: milestone
-status: Ready to execute
+status: Phase complete — ready for verification
-stopped_at: Completed 11-01-PLAN.md
+stopped_at: Completed 11-02-PLAN.md
-last_updated: "2026-03-24T08:49:28.728Z"
+last_updated: "2026-04-03T19:28:12.418Z"
 progress:
   total_phases: 4
-  completed_phases: 3
+  completed_phases: 4
   total_plans: 6
-  completed_plans: 5
+  completed_plans: 6
 ---
 
 # Project State
@@ -39,6 +39,7 @@ Plan: 2 of 2
 | Phase 09-task-creation-ux P01 | 2 | 1 tasks | 4 files |
 | Phase 10-dead-code-cleanup P01 | 5 | 2 tasks | 4 files |
 | Phase 11-issue-3-tasks-management-allow-task-checking-anytime-and-pre-populate-recurring-tasks P01 | 219 | 2 tasks | 4 files |
+| Phase 11-issue-3-tasks-management-allow-task-checking-anytime-and-pre-populate-recurring-tasks P02 | 15 | 2 tasks | 6 files |
 
 ## Accumulated Context
 
@@ -56,6 +57,9 @@ Decisions archived to PROJECT.md Key Decisions table.
 - [Phase 10-dead-code-cleanup]: TaskWithRoom retained in daily_plan_models.dart — actively used by calendar_dao.dart, calendar_providers.dart, and related calendar files
 - [Phase 11-issue-3-tasks-management-allow-task-checking-anytime-and-pre-populate-recurring-tasks]: D-01: Remove isFuture/canComplete restrictions — checkboxes always enabled across all UI; calendar_task_row.dart unchanged (caller was applying restriction)
 - [Phase 11-issue-3-tasks-management-allow-task-checking-anytime-and-pre-populate-recurring-tasks]: D-02: When completing on non-due day, use today as baseDate for nextDueDate calculation (todayStart == taskDueDay pattern)
+- [Phase 11-issue-3-tasks-management-allow-task-checking-anytime-and-pre-populate-recurring-tasks]: D-03: Pre-population via query-time virtual instances — no schema migration
+- [Phase 11-issue-3-tasks-management-allow-task-checking-anytime-and-pre-populate-recurring-tasks]: D-04: _subtractMonths uses total-month arithmetic to handle January-boundary year crossings correctly
+- [Phase 11-issue-3-tasks-management-allow-task-checking-anytime-and-pre-populate-recurring-tasks]: D-05: Pre-populated tasks rendered in Demnächst section below day tasks with 0.55 Opacity
 
 ### Pending Todos
 
@@ -71,7 +75,7 @@ None.
 
 ## Session Continuity
 
-Last session: 2026-03-24T08:49:28.726Z
+Last session: 2026-04-03T19:28:12.416Z
-Stopped at: Completed 11-01-PLAN.md
+Stopped at: Completed 11-02-PLAN.md
 Resume file: None
 Next action: Phase 10 complete

.planning/phases/11-issue-3-tasks-management-allow-task-checking-anytime-and-pre-populate-recurring-tasks/11-02-SUMMARY.md

@@ -0,0 +1,151 @@
+---
+phase: 11-issue-3-tasks-management-allow-task-checking-anytime-and-pre-populate-recurring-tasks
+plan: 02
+subsystem: ui, database, domain
+tags: [flutter, drift, riverpod, pre-population, recurring-tasks, calendar, interval-window]
+
+# Dependency graph
+requires:
+  - phase: 11-issue-3-tasks-management-allow-task-checking-anytime-and-pre-populate-recurring-tasks
+    plan: 11-01
+    provides: Always-enabled checkboxes and today-base completeTask behavior
+
+provides:
+  - watchAllActiveRecurringTasks and watchAllActiveRecurringTasksInRoom DAO queries
+  - watchCompletionsInRange DAO query for period-completion filtering
+  - CalendarDayState.prePopulatedTasks field
+  - _isInCurrentIntervalWindow and _calculatePreviousDueDate pre-population helpers
+  - calendarDayProvider and roomCalendarDayProvider pre-population logic
+  - "Demnächst" section with 0.55 opacity rendering in CalendarDayList
+
+affects:
+  - Home screen calendar day view (pre-populated tasks now visible)
+  - Room-scoped calendar view (same pre-population logic)
+  - Celebration state (now checks prePopulatedTasks.isEmpty too)
+
+# Tech tracking
+tech-stack:
+  added: []
+  patterns:
+    - "Interval window pre-population: query-time virtual instances, no schema migration"
+    - "Period-completion filtering: watchCompletionsInRange excludes already-completed tasks"
+    - "Total-month arithmetic for _subtractMonths: avoids year-boundary bugs with negative months"
+    - "0.55 opacity for pre-populated task rows via Opacity widget wrapper"
+
+key-files:
+  created: []
+  modified:
+    - lib/features/home/data/calendar_dao.dart
+    - lib/features/home/domain/calendar_models.dart
+    - lib/features/home/presentation/calendar_providers.dart
+    - lib/features/home/presentation/calendar_day_list.dart
+    - lib/features/home/presentation/calendar_task_row.dart
+    - test/features/home/data/calendar_dao_test.dart
+
+key-decisions:
+  - "D-03: Pre-population via query-time virtual instances — no schema migration, no stored virtual rows"
+  - "D-04: _subtractMonths uses total-month arithmetic (year*12+month-1) to correctly handle January-boundary crossings"
+  - "D-05: Pre-populated tasks rendered in 'Demnächst' section below day tasks with 0.55 Opacity"
+  - "D-06: Celebration state now includes prePopulatedTasks.isEmpty — pre-populated tasks prevent celebration"
+
+patterns-established:
+  - "Interval window: selected date AFTER previousDue (exclusive) AND BEFORE nextDueDate (exclusive)"
+  - "Period completion filter: watchCompletionsInRange(taskId, prevDue, nextDue+1day)"
+  - "Muted pre-population UI: Opacity(0.55) wrapping ListTile, isPrePopulated flag propagated through widget tree"
+
+requirements-completed:
+  - TM-03
+  - TM-04
+  - TM-05
+
+# Metrics
+duration: ~15min
+completed: 2026-04-03
+---
+
+# Phase 11 Plan 02: Pre-populate Recurring Tasks on Interval Window Summary
+
+**Interval-window pre-population via query-time virtual instances with period-completion filtering and 0.55 opacity muted visual distinction**
+
+## Performance
+
+- **Duration:** ~15 min
+- **Started:** 2026-04-03
+- **Completed:** 2026-04-03
+- **Tasks:** 2
+- **Files modified:** 6
+
+## Accomplishments
+
+- Added `watchAllActiveRecurringTasks()` and `watchAllActiveRecurringTasksInRoom(roomId)` to `CalendarDao` — fetch all active tasks for pre-population source data
+- Added `watchCompletionsInRange(taskId, start, end)` to `CalendarDao` — check if a task was completed in the current interval period (prevents re-showing completed tasks)
+- Extended `CalendarDayState` with `prePopulatedTasks` field (default empty for backward compatibility); updated `isEmpty` getter to include `prePopulatedTasks.isEmpty`
+- Added `_isInCurrentIntervalWindow()` helper: determines if a task's current interval window includes `selectedDate` (selected is after previousDue and before nextDueDate)
+- Added `_calculatePreviousDueDate()` helper: reverse-calculates start of current interval window by subtracting one interval
+- Rewrote `calendarDayProvider` and `roomCalendarDayProvider` to combine three streams: due-today, overdue, and pre-populated virtual instances with period-completion exclusion
+- Added `isPrePopulated` parameter to `CalendarTaskRow` with `Opacity(0.55)` wrapper for muted visual style
+- Rendered "Demnächst" section in `CalendarDayList` below day tasks, with muted section header and `isPrePopulated: true` rows
+- Added 9 new DAO tests for `watchAllActiveRecurringTasks`, `watchAllActiveRecurringTasksInRoom`, `watchCompletionsInRange`
+
+## Task Commits
+
+Each task was committed atomically:
+
+1. **Task 1: DAO queries, CalendarDayState model, pre-population provider** - `9a67c51` (feat)
+2. **Task 2: UI rendering with muted visual distinction** - `8cbe989` (feat)
+
+## Files Created/Modified
+
+- `lib/features/home/data/calendar_dao.dart` — Added `watchAllActiveRecurringTasks()`, `watchAllActiveRecurringTasksInRoom()`, `watchCompletionsInRange()`
+- `lib/features/home/domain/calendar_models.dart` — Added `prePopulatedTasks` field with default empty, updated `isEmpty`
+- `lib/features/home/presentation/calendar_providers.dart` — Added `_isInCurrentIntervalWindow`, `_calculatePreviousDueDate`, `_subtractMonths` helpers; rewrote both providers with pre-population logic; added `IntervalType` and `database.dart` imports
+- `lib/features/home/presentation/calendar_day_list.dart` — Added "Demnächst" section, updated `_buildAnimatedTaskRow` with `isPrePopulated`, updated `_CompletingTaskRow`, updated celebration check, updated cleanup loop
+- `lib/features/home/presentation/calendar_task_row.dart` — Added `isPrePopulated` parameter and `Opacity(0.55)` wrapper
+- `test/features/home/data/calendar_dao_test.dart` — Added 9 tests across 3 new test groups; added `drift/drift.dart` import for `Value`
+
+## Decisions Made
+
+- Pre-population uses query-time virtual instances — no schema migration, no stored virtual rows. Provider layer computes which tasks appear on a given day by checking their interval window.
+- `_subtractMonths` uses total-month arithmetic (`year*12 + month - 1 - months`) instead of the plan's proposed formula, which had a year-boundary bug for months <= 0 (e.g. January - 1 month would incorrectly stay in the same year with Dart's truncation division).
+- Celebration state updated to check `prePopulatedTasks.isEmpty` — a day with only pre-populated tasks does not show the celebration screen (tasks still need doing).
+
+## Deviations from Plan
+
+### Auto-fixed Issues
+
+**1. [Rule 1 - Bug] Fixed _subtractMonths year-boundary arithmetic**
+
+- **Found during:** Task 1
+- **Issue:** The plan's proposed `_subtractMonths` formula used `(targetMonth - 1) ~/ 12` for year calculation. In Dart, `~/` is truncation-toward-zero division, so `(-1) ~/ 12 = 0` (not `-1`). This means subtracting 1 month from January 2026 would produce year 2026 instead of 2025.
+- **Fix:** Replaced with total-month arithmetic: `totalMonths = date.year * 12 + (date.month - 1) - months`, then `targetYear = totalMonths ~/ 12`, `normalizedMonth = (totalMonths % 12) + 1`. This is always correct for any combination of year and months.
+- **Files modified:** `lib/features/home/presentation/calendar_providers.dart`
+- **Commit:** `9a67c51`
+
+## Known Stubs
+
+None.
+
+## User Setup Required
+
+None — no external service configuration required.
+
+## Next Phase Readiness
+
+- Pre-population of recurring tasks fully implemented
+- Phase 11 (Issue #3) complete — both plans executed
+- No blockers
+
+## Self-Check: PASSED
+
+- FOUND: lib/features/home/data/calendar_dao.dart
+- FOUND: lib/features/home/domain/calendar_models.dart
+- FOUND: lib/features/home/presentation/calendar_providers.dart
+- FOUND: lib/features/home/presentation/calendar_day_list.dart
+- FOUND: lib/features/home/presentation/calendar_task_row.dart
+- FOUND: test/features/home/data/calendar_dao_test.dart
+- FOUND: commit 9a67c51 (Task 1 - DAO queries + provider logic)
+- FOUND: commit 8cbe989 (Task 2 - UI rendering)
+
+---
+*Phase: 11-issue-3-tasks-management-allow-task-checking-anytime-and-pre-populate-recurring-tasks*
+*Completed: 2026-04-03*