docs(18-03): create summary and update state for DecisionList/TaskDetailModal plan

.planning/STATE.md

@@ -10,18 +10,18 @@ See: .planning/PROJECT.md (updated 2026-02-04)
 ## Current Position
 
 Phase: 18 of 21 (Initiative Detail)
-Plan: 2 of 4 in current phase
+Plan: 3 of 4 in current phase
 Status: In progress
-Last activity: 2026-02-04 - Completed 18-02-PLAN.md
+Last activity: 2026-02-04 - Completed 18-03-PLAN.md
 
 Progress: █████████░ 97%
 
 ## Performance Metrics
 
 **Velocity:**
-- Total plans completed: 67
+- Total plans completed: 68
 - Average duration: 3 min
-- Total execution time: 188 min
+- Total execution time: 191 min
 
 **By Phase (v1.0):**
 
@@ -206,6 +206,8 @@ Recent decisions affecting current work:
 - 18-02: SerializedTask type defined in TaskRow (same Date-to-string serialization pattern as SerializedInitiative)
 - 18-02: Phase hierarchy flattened — Plan layer hidden per decision 15-02, tasks rendered directly under phase
 - 18-02: Underscore prefix for unused type prop in DependencyIndicator (_type) to satisfy noUnusedParameters
+- 18-03: SerializedTask type mirrors SerializedInitiative pattern (Date fields become string over JSON)
+- 18-03: Both DecisionList and TaskDetailModal are purely presentational with callback props (no tRPC calls inside)
 
 ### Pending Todos
 
@@ -228,5 +230,5 @@ None.
 ## Session Continuity
 
 Last session: 2026-02-04
-Stopped at: Completed 18-02-PLAN.md
+Stopped at: Completed 18-03-PLAN.md
 Resume file: None

.planning/phases/18-initiative-detail/18-03-SUMMARY.md

@@ -0,0 +1,44 @@
+# Plan 18-03 Summary
+
+## Result: COMPLETE
+
+**Tasks:** 2/2 completed
+**Duration:** ~3 min
+
+## What was built
+
+### DecisionList component
+- Collapsible list of key decisions in a Card with "Key Decisions" header
+- Each decision individually expandable with ChevronDown/ChevronRight indicators
+- Internal state tracks expanded indices via `Set<number>`
+- Show more/less button when decisions exceed `maxVisible` (default 3)
+- Empty state placeholder: "No decisions recorded"
+- File: `packages/web/src/components/DecisionList.tsx`
+
+### TaskDetailModal component
+- Controlled Dialog (open when `task !== null`) following CreateInitiativeDialog pattern
+- Metadata grid: Status (StatusBadge), Priority, Phase, Type, Agent
+- Description section with fallback to "No description"
+- Dependencies section listing dependency names with status badges
+- Blocks section listing dependent names with status badges
+- Queue Task button: enabled only when status is 'pending' and all dependencies completed
+- Stop Task button: enabled only when status is 'in_progress'
+- SerializedTask interface for tRPC Date-to-string wire format
+- File: `packages/web/src/components/TaskDetailModal.tsx`
+
+## Decisions
+
+- 18-03: SerializedTask type mirrors SerializedInitiative pattern (Date fields become string over JSON)
+- 18-03: Both components are purely presentational with callback props (no tRPC calls inside)
+
+## Commits
+
+- `3baba49`: feat(18-03): create DecisionList component for initiative detail
+- `5b17b7a`: feat(18-03): create TaskDetailModal component for initiative detail
+
+## Verification
+
+- [x] `npx tsc --noEmit -p packages/web/tsconfig.app.json` passes
+- [x] `npx vite build` in packages/web succeeds
+- [x] Both components export correctly
+- [x] Dialog follows controlled pattern matching CreateInitiativeDialog