docs(03-01): complete collapsible sections foundations plan

.planning/STATE.md

@@ -2,16 +2,16 @@
 gsd_state_version: 1.0
 milestone: v1.0
 milestone_name: milestone
-status: executing
-stopped_at: Completed 02-03-PLAN.md — Phase 2 complete
-last_updated: "2026-03-16T13:29:30.468Z"
-last_activity: 2026-03-16 — Completed 02-01 (Month Navigation and Chart Infrastructure)
+status: planning
+stopped_at: Completed 03-01-PLAN.md — CategorySection, CollapsibleSections, carryover display built
+last_updated: "2026-03-17T14:09:55.087Z"
+last_activity: 2026-03-16 — Phase 2 complete, transitioned to Phase 3
 progress:
   total_phases: 4
   completed_phases: 2
-  total_plans: 5
-  completed_plans: 5
-  percent: 80
+  total_plans: 7
+  completed_plans: 6
+  percent: 100
 ---
 
 # Project State
@@ -55,6 +55,7 @@ Progress: [████████████████████] 5/5 pla
 | Phase 02 P02 | 2min | 2 tasks | 4 files |
 | Phase 02 P01 | 2min | 2 tasks | 4 files |
 | Phase 02-dashboard-charts-and-layout P03 | 3min | 2 tasks | 2 files |
+| Phase 03-collapsible-dashboard-sections P01 | 2min | 2 tasks | 8 files |
 
 ## Accumulated Context
 
@@ -76,6 +77,9 @@ Recent decisions affecting current work:
 - [Phase 02-03]: useMemo hooks declared before early returns (Rules of Hooks compliance)
 - [Phase 02-03]: QuickAdd button placed below chart grid (SummaryStrip -> charts -> QuickAdd ordering)
 - [Phase 02-03]: Chart grid uses md:grid-cols-2 lg:grid-cols-3 responsive breakpoints
+- [Phase 03-collapsible-dashboard-sections]: CategorySection uses controlled open/onOpenChange pattern — Plan 02 will own open state in DashboardContent
+- [Phase 03-collapsible-dashboard-sections]: Direction-aware diff: spending types (bill, variable_expense, debt) over when actual > budgeted; income/saving/investment over when actual < budgeted
+- [Phase 03-collapsible-dashboard-sections]: CollapsibleContent wired to CSS keyframes via data-[state=open]:animate-collapsible-open Tailwind variant
 
 ### Pending Todos
 
@@ -87,6 +91,6 @@ None yet.
 
 ## Session Continuity
 
-Last session: 2026-03-16
-Stopped at: Phase 2 complete, ready to plan Phase 3
+Last session: 2026-03-17T14:09:55.085Z
+Stopped at: Completed 03-01-PLAN.md — CategorySection, CollapsibleSections, carryover display built
 Resume file: None