docs(18-01): complete InitiativeHeader & ProgressPanel plan

Tasks completed: 2/2
- InitiativeHeader with back button, name, status badge, dates
- ProgressPanel with progress bar and phase/task counts

SUMMARY: .planning/phases/18-initiative-detail/18-01-SUMMARY.md

.planning/phases/18-initiative-detail/18-01-SUMMARY.md

@@ -0,0 +1,87 @@
+---
+phase: 18-initiative-detail
+plan: 01
+subsystem: ui
+tags: [react, tailwind, lucide-react, shadcn-ui]
+
+# Dependency graph
+requires:
+  - phase: 17-initiative-dashboard
+    provides: StatusBadge, ProgressBar, InitiativeCard component patterns
+provides:
+  - InitiativeHeader component with back navigation, metadata display
+  - ProgressPanel component with progress bar and phase/task counts
+affects: [18-04 page assembly, initiative detail page]
+
+# Tech tracking
+tech-stack:
+  added: []
+  patterns: [presentational component with serialized props]
+
+key-files:
+  created:
+    - packages/web/src/components/InitiativeHeader.tsx
+    - packages/web/src/components/ProgressPanel.tsx
+  modified: []
+
+key-decisions:
+  - "18-01: Reuse SerializedInitiative shape for header props (consistent with InitiativeCard)"
+  - "18-01: Actions button disabled as placeholder — wired in Plan 04"
+
+patterns-established:
+  - "Detail page header pattern: back button + metadata card"
+
+# Metrics
+duration: 3min
+completed: 2026-02-04
+---
+
+# Phase 18 Plan 01: InitiativeHeader & ProgressPanel Summary
+
+**InitiativeHeader with back navigation, status badge, and date metadata; ProgressPanel with task-based progress bar and phase/task counts**
+
+## Performance
+
+- **Duration:** 3 min
+- **Started:** 2026-02-04
+- **Completed:** 2026-02-04
+- **Tasks:** 2
+- **Files modified:** 2
+
+## Accomplishments
+- InitiativeHeader component with ChevronLeft back button, initiative name h1, StatusBadge, and formatted created/updated dates
+- ProgressPanel component reusing ProgressBar with phase and task completion stats
+- Both components are pure presentational (no data fetching), ready for page assembly in Plan 04
+
+## Task Commits
+
+Each task was committed atomically:
+
+1. **Task 1: Create InitiativeHeader component** - `62409a6` (feat)
+2. **Task 2: Create ProgressPanel component** - `8cfc197` (feat)
+
+## Files Created/Modified
+- `packages/web/src/components/InitiativeHeader.tsx` - Header with back button, initiative name, status badge, created/updated dates
+- `packages/web/src/components/ProgressPanel.tsx` - Card with progress bar and phase/task completion counts
+
+## Decisions Made
+- 18-01: Reuse SerializedInitiative shape for header props (dates as ISO strings, consistent with InitiativeCard)
+- 18-01: Actions button disabled as placeholder — full actions dropdown comes in Plan 04
+
+## Deviations from Plan
+
+None - plan executed exactly as written.
+
+## Issues Encountered
+None
+
+## User Setup Required
+None - no external service configuration required.
+
+## Next Phase Readiness
+- Both components ready for page assembly in Plan 04
+- Ready for 18-02-PLAN.md (next plan in phase)
+
+---
+*Phase: 18-initiative-detail*
+*Completed: 2026-02-04*