docs: start milestone v1.2 Polish & Task Management

Define requirements (9 total: task delete, creation UX, cleanup),
create roadmap (phases 8-10), and update PROJECT.md with new
milestone goals. Room cover photos dropped from scope.

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

.planning/PROJECT.md

@@ -8,6 +8,16 @@ A local-first Flutter app for organizing household chores, built for personal/co
 
 Users can see what needs doing today, mark it done, and trust the app to schedule the next occurrence — without thinking about it.
 
+## Current Milestone: v1.2 Polish & Task Management
+
+**Goal:** Add task delete with smart soft/hard behavior, rework the task creation frequency picker for better UX, and clean up dead code from v1.0.
+
+**Target features:**
+- Delete action in task edit form (hard delete if never completed, soft delete if completed at least once)
+- Intuitive "Every [N] [unit]" frequency picker replacing the flat preset chip grid
+- Common frequency shortcuts (daily, weekly, biweekly, monthly) as quick-select
+- Dead code cleanup (orphaned v1.0 daily plan files)
+
 ## Requirements
 
 ### Validated
@@ -27,9 +37,11 @@ Users can see what needs doing today, mark it done, and trust the app to schedul
 
 ### Active
 
-- [ ] Data export/import (JSON)
-- [ ] English localization
-- [ ] Room cover photos from camera or gallery
+- [ ] Task delete with smart soft/hard behavior
+- [ ] Task creation frequency picker UX rework
+- [ ] Dead code cleanup (v1.0 daily plan files)
+- [ ] Data export/import (JSON) — deferred
+- [ ] English localization — deferred
 
 ### Out of Scope
 
@@ -46,6 +58,7 @@ Users can see what needs doing today, mark it done, and trust the app to schedul
 - Weekly/monthly calendar views — date strip is sufficient for task app
 - Drag tasks between days — tasks auto-schedule based on frequency
 - Calendar sync (Google/Apple) — contradicts local-first, offline-only design
+- Room cover photos from camera or gallery — dropped, clean design preferred
 - Statistics & insights dashboard — v2.0
 - Onboarding wizard — v2.0
 - Custom accent color picker — v2.0
@@ -90,4 +103,4 @@ Users can see what needs doing today, mark it done, and trust the app to schedul
 | PopupMenuButton for sort UI | Material 3 AppBar action pattern, overlay menu | Good — clean integration in both HomeScreen and TaskListScreen AppBars |
 
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-*Last updated: 2026-03-16 after v1.1 milestone completed*
+*Last updated: 2026-03-18 after v1.2 milestone started*