docs(03-02): complete delete confirmation and empty states plan

- Create 03-02-SUMMARY.md documenting EmptyState component and delete confirmation dialog
- Update STATE.md with progress (88%), decisions, and session info
- Update ROADMAP.md with Phase 3 plan progress (3/4 summaries)

.planning/STATE.md

@@ -3,8 +3,8 @@ gsd_state_version: 1.0
 milestone: v1.0
 milestone_name: milestone
 status: planning
-stopped_at: Completed 03-00-PLAN.md
+stopped_at: Completed 03-02-PLAN.md
-last_updated: "2026-03-11T21:33:29.235Z"
+last_updated: "2026-03-11T21:33:38.813Z"
 last_activity: 2026-03-11 — Roadmap created from requirements and research
 progress:
   total_phases: 4
@@ -81,6 +81,9 @@ Recent decisions affecting current work:
 - [Phase 03-interaction-quality-and-completeness]: Budget Edit spinner deferred — no BudgetEdit form component exists in codebase yet
 - [Phase 03-interaction-quality-and-completeness]: Mock useBudgets hook in DashboardPage tests to control loading state directly
 - [Phase 03-interaction-quality-and-completeness]: BillsTracker renders a full Card component — tests render it standalone, not inside a <tr>
+- [Phase 03-interaction-quality-and-completeness]: EmptyState is a shared component with all content as props — icon, heading, subtext, and optional CTA
+- [Phase 03-interaction-quality-and-completeness]: Delete dialog does not auto-close on error — user must read ON DELETE RESTRICT message before dismissing
+- [Phase 03-interaction-quality-and-completeness]: CategoriesPage loading state initialized true, set false in finally block to prevent empty-state flash
 
 ### Pending Todos
 
@@ -93,6 +96,6 @@ None yet.
 
 ## Session Continuity
 
-Last session: 2026-03-11T21:33:17.674Z
+Last session: 2026-03-11T21:33:38.811Z
-Stopped at: Completed 03-00-PLAN.md
+Stopped at: Completed 03-02-PLAN.md
 Resume file: None

.planning/phases/03-interaction-quality-and-completeness/03-02-SUMMARY.md

@@ -0,0 +1,108 @@
+---
+phase: 03-interaction-quality-and-completeness
+plan: 02
+subsystem: ui
+tags: [react, shadcn, lucide-react, empty-state, delete-confirmation, dialog, spinner]
+
+# Dependency graph
+requires:
+  - phase: 03-00
+    provides: Phase 3 context and research
+provides:
+  - EmptyState shared component with icon, heading, subtext, and optional CTA
+  - Delete confirmation dialog in CategoriesPage with spinner and inline error handling
+  - Empty states on Dashboard (no budgets) and Categories (no categories) pages
+affects: [future-ui-phases, empty-state-patterns]
+
+# Tech tracking
+tech-stack:
+  added: []
+  patterns:
+    - EmptyState as shared component for zero-data states across pages
+    - Delete confirmation dialog pattern with pendingDelete state, spinner, and inline error
+    - loading guard to prevent empty-state flash on initial fetch
+
+key-files:
+  created:
+    - frontend/src/components/EmptyState.tsx
+  modified:
+    - frontend/src/pages/DashboardPage.tsx
+    - frontend/src/pages/CategoriesPage.tsx
+
+key-decisions:
+  - "EmptyState is a shared component (not per-page) — icon, heading, subtext, and optional CTA are all props"
+  - "Delete dialog does not auto-close on error — user must read the ON DELETE RESTRICT message and dismiss manually"
+  - "CategoriesPage uses a loading state (initialized true) to prevent empty-state flash before first fetch completes"
+
+patterns-established:
+  - "EmptyState pattern: icon + heading + subtext + optional action button in centered flex column"
+  - "Delete confirmation pattern: pendingDelete state object, confirmDelete async handler, inline deleteError display"
+
+requirements-completed: [IXTN-05, STATE-01, STATE-02]
+
+# Metrics
+duration: 5min
+completed: 2026-03-11
+---
+
+# Phase 3 Plan 02: Delete Confirmation and Empty States Summary
+
+**Shared EmptyState component plus delete confirmation dialog with spinner and ON DELETE RESTRICT error handling for CategoriesPage**
+
+## Performance
+
+- **Duration:** 5 min
+- **Started:** 2026-03-11T21:30:37Z
+- **Completed:** 2026-03-11T21:33:00Z
+- **Tasks:** 2
+- **Files modified:** 3
+
+## Accomplishments
+
+- Created shared `EmptyState` component with icon, heading, subtext, and optional CTA button
+- Wired EmptyState into DashboardPage (no-budgets case and no-current-budget case) and CategoriesPage (no-categories case with loading guard)
+- Replaced direct delete in CategoriesPage with confirmation dialog using `pendingDelete` state, spinner feedback, and inline error display for ON DELETE RESTRICT failures
+
+## Task Commits
+
+Each task was committed atomically:
+
+1. **Task 1 + Task 2: EmptyState, Dashboard empty state, Categories empty state + delete confirmation dialog** - `4fc6389` (feat)
+
+**Plan metadata:** (docs commit — pending)
+
+_Note: Task 1 and Task 2 were both implemented in the same editing session and verified together before commit._
+
+## Files Created/Modified
+
+- `frontend/src/components/EmptyState.tsx` - Shared empty state component with icon, heading, subtext, and optional CTA
+- `frontend/src/pages/DashboardPage.tsx` - Added EmptyState for no-budgets and no-current-budget cases; imports EmptyState and FolderOpen
+- `frontend/src/pages/CategoriesPage.tsx` - Added loading state, EmptyState for no-categories case, delete confirmation dialog with spinner and error handling
+
+## Decisions Made
+
+- EmptyState is a generic shared component with all content as props — keeps the component reusable across any future zero-data scenarios
+- Delete dialog stays open on error — intentional so users can read the ON DELETE RESTRICT constraint message before dismissing
+- CategoriesPage `loading` state initialized to `true` and set to `false` in a `finally` block — prevents empty-state flash before data arrives
+
+## Deviations from Plan
+
+None - plan executed exactly as written.
+
+## Issues Encountered
+
+None.
+
+## User Setup Required
+
+None - no external service configuration required.
+
+## Next Phase Readiness
+
+- EmptyState component is ready for reuse in any other page needing zero-data messaging
+- Delete confirmation pattern established — can be replicated for budget item deletion or other destructive actions in Phase 3 plans
+- No blockers for remaining Phase 3 plans
+
+---
+*Phase: 03-interaction-quality-and-completeness*
+*Completed: 2026-03-11*