---
phase: 18-initiative-detail
plan: 04
subsystem: ui
tags: [react, trpc, tanstack-router, tailwind]

# Dependency graph
requires:
  - plan: 18-01
    provides: InitiativeHeader, ProgressPanel
  - plan: 18-02
    provides: PhaseAccordion, TaskRow, DependencyIndicator
  - plan: 18-03
    provides: DecisionList, TaskDetailModal
provides:
  - Fully assembled Initiative Detail page with data fetching and component wiring
affects: [initiative detail route, /initiatives/$id]

# Tech tracking
tech-stack:
  added: []
  patterns: [PhaseWithTasks helper component for stable hooks, PlanTasksFetcher data component]

key-files:
  created: []
  modified:
    - packages/web/src/routes/initiatives/$id.tsx

key-decisions:
  - "18-04: PhaseWithTasks helper component pattern solves hooks-in-loops problem for nested data fetching"
  - "18-04: PlanTasksFetcher renders null — data-only component for per-plan task fetching with stable hook count"
  - "18-04: Task counts aggregated via callback from PhaseWithTasks to page-level state"
  - "18-04: DecisionList passed empty array — no backend endpoint for decisions yet"
  - "18-04: Phase/task dependencies simplified (empty arrays) for v1 — full dependency resolution deferred"

patterns-established:
  - "Data-fetching component pattern: render null, report data via callback props"
  - "Nested tRPC fetching: parent fetches list, child component fetches per-item details"

# Metrics
duration: 4min
completed: 2026-02-04
---

# Phase 18 Plan 04: Initiative Detail Page Assembly Summary

**Wire all Phase 18 components into the $id.tsx route with tRPC data fetching, queue actions, and full build verification**

## Performance

- **Duration:** 4 min
- **Started:** 2026-02-04
- **Completed:** 2026-02-04
- **Tasks:** 2
- **Files modified:** 1

## Accomplishments
- Replaced placeholder Initiative Detail page with full implementation
- Data fetching via tRPC: getInitiative, listPhases, listPlans (per phase), listTasks (per plan)
- PhaseWithTasks helper component solves the hooks-in-loops problem by giving each phase its own component instance with stable hook count
- PlanTasksFetcher data component fetches tasks per plan and reports upward via callbacks
- Two-column layout: phases on left, progress panel + decisions on right (lg:grid-cols-[1fr_340px])
- Task counts aggregated from PhaseWithTasks children into page-level state for ProgressPanel
- TaskDetailModal opens on task click with phase name, dependencies, and queue/stop actions
- Queue All button dispatches all pending phases; Queue Task button in modal dispatches single task
- Loading/error states matching InitiativeList patterns
- First incomplete phase expanded by default

## Task Commits

Each task was committed atomically:

1. **Task 1: Wire Initiative Detail page with data fetching and all components** - `1e26bfa` (feat)
2. **Task 2: Verify full build and integration** - No code changes needed; all builds passed

## Files Created/Modified
- `packages/web/src/routes/initiatives/$id.tsx` - Full initiative detail page with data fetching, component wiring, queue actions, and modal

## Decisions Made
- 18-04: PhaseWithTasks helper component pattern solves hooks-in-loops problem for nested data fetching
- 18-04: PlanTasksFetcher renders null — data-only component for per-plan task fetching with stable hook count
- 18-04: Task counts aggregated via callback from PhaseWithTasks to page-level state
- 18-04: DecisionList passed empty array — no backend endpoint for decisions yet
- 18-04: Phase/task dependencies simplified (empty arrays) for v1 — full dependency resolution deferred

## Deviations from Plan

- Skipped `instanceof Date` checks for serialization — tRPC serializes Date to string over JSON, so `String()` wrapping is sufficient
- No separate commit for Task 2 since no code changes were needed

## Issues Encountered
None

## User Setup Required
None — no external service configuration required.

## Verification

- [x] `npx tsc --noEmit -p packages/web/tsconfig.app.json` passes
- [x] `npx vite build` in packages/web succeeds
- [x] `npm run build` in root succeeds
- [x] Route registered in routeTree.gen.ts for /initiatives/$id

## Next Phase Readiness
- Phase 18 (Initiative Detail) is complete
- Ready for Phase 19 (next phase in ROADMAP)

---
*Phase: 18-initiative-detail*
*Completed: 2026-02-04*