docs(04-02): complete interaction tests plan

.planning/REQUIREMENTS.md

@@ -45,7 +45,7 @@ Requirements for initial release. Each maps to roadmap phases.
 - [x] **TEST-01**: PHPUnit tests for the data aggregation service (timezone-correct day grouping)
 - [x] **TEST-02**: PHPUnit tests for the API endpoint (response format, filtering)
 - [ ] **TEST-03**: JavaScript tests for d3 heatmap rendering (grid structure, color mapping)
-- [ ] **TEST-04**: JavaScript tests for tooltip and click interaction behavior
+- [x] **TEST-04**: JavaScript tests for tooltip and click interaction behavior
 
 ## v2 Requirements
 
@@ -99,7 +99,7 @@ Which phases cover which requirements. Updated during roadmap creation.
 | TEST-03 | Phase 3 | Pending |
 | HEAT-07 | Phase 4 | Complete |
 | INTR-01 | Phase 4 | Complete |
-| TEST-04 | Phase 4 | Pending |
+| TEST-04 | Phase 4 | Complete |
 | POLI-01 | Phase 5 | Pending |
 | POLI-02 | Phase 5 | Pending |
 | POLI-03 | Phase 5 | Pending |

.planning/ROADMAP.md

@@ -15,7 +15,7 @@ Decimal phases appear between their surrounding integers in numeric order.
 - [x] **Phase 1: Dev Environment** - Nix flake with local Kimai instance and seeded test data
 - [x] **Phase 2: Plugin Scaffold + Data Layer** - Symfony bundle, dashboard widget, aggregation API with PHPUnit tests
 - [x] **Phase 3: Core Heatmap Rendering** - d3.js calendar grid with color mapping, labels, tooltips, theme integration, and JS tests
-- [ ] **Phase 4: Heatmap Interaction** - Click-through navigation, project/activity filtering, interaction tests
+- [x] **Phase 4: Heatmap Interaction** - Click-through navigation, project/activity filtering, interaction tests (completed 2026-04-08)
 - [ ] **Phase 5: Polish** - Streak indicator, summary stats, weekend styling
 
 ## Phase Details
@@ -77,12 +77,12 @@ Plans:
   2. A dropdown allows filtering the heatmap to show data for a single project or activity
   3. Filtering updates the heatmap in place without a full page reload
   4. JavaScript tests verify click navigation and tooltip interaction behavior
-**Plans:** 2 plans
+**Plans:** 2/2 plans complete
 **UI hint**: yes
 
 Plans:
 - [x] 04-01: Day cell click navigation + project filter dropdown
-- [ ] 04-02: Vitest tests for click navigation and filter behavior
+- [x] 04-02: Vitest tests for click navigation and filter behavior
 
 ### Phase 5: Polish
 **Goal**: The widget provides at-a-glance context beyond the heatmap itself -- streaks, stats, and visual cues for weekends
@@ -109,5 +109,5 @@ Phases execute in numeric order: 1 -> 2 -> 3 -> 4 -> 5
 | 1. Dev Environment | 2/2 | Done | 2026-04-08 |
 | 2. Plugin Scaffold + Data Layer | 2/2 | Done | 2026-04-08 |
 | 3. Core Heatmap Rendering | 3/3 | Done | 2026-04-08 |
-| 4. Heatmap Interaction | 0/2 | Not started | - |
+| 4. Heatmap Interaction | 2/2 | Complete   | 2026-04-08 |
 | 5. Polish | 0/2 | Not started | - |

.planning/STATE.md

@@ -2,16 +2,16 @@
 gsd_state_version: 1.0
 milestone: v1.0
 milestone_name: milestone
-status: executing
+status: verifying
-stopped_at: Completed 04-01-PLAN.md
+stopped_at: Completed 04-02-PLAN.md
-last_updated: "2026-04-08T13:31:58.924Z"
+last_updated: "2026-04-08T13:35:22.113Z"
 last_activity: 2026-04-08
 progress:
   total_phases: 5
-  completed_phases: 0
+  completed_phases: 1
   total_plans: 4
-  completed_plans: 2
+  completed_plans: 3
-  percent: 50
+  percent: 75
 ---
 
 # Project State
@@ -27,7 +27,7 @@ See: .planning/PROJECT.md (updated 2026-04-08)
 
 Phase: 4 (Heatmap Interaction) — EXECUTING
 Plan: 2 of 2
-Status: Ready to execute
+Status: Phase complete — ready for verification
 Last activity: 2026-04-08
 
 Progress: [██░░░░░░░░] 20%
@@ -56,6 +56,7 @@ Progress: [██░░░░░░░░] 20%
 | Phase 03 P01 | 3min | 4 tasks | 7 files |
 | Phase 03 P03 | 2min | 4 tasks | 1 files |
 | Phase 04 P01 | 2min | 2 tasks | 7 files |
+| Phase 04 P02 | 1min | 2 tasks | 2 files |
 
 ## Accumulated Context
 
@@ -89,6 +90,6 @@ None yet.
 
 ## Session Continuity
 
-Last session: 2026-04-08T13:31:58.922Z
+Last session: 2026-04-08T13:35:22.111Z
-Stopped at: Completed 04-01-PLAN.md
+Stopped at: Completed 04-02-PLAN.md
 Resume file: None

.planning/phases/04-heatmap-interaction/04-02-SUMMARY.md

@@ -0,0 +1,85 @@
+---
+phase: 04-heatmap-interaction
+plan: 02
+subsystem: testing
+tags: [vitest, d3, heatmap, click-navigation, project-filter, typescript]
+
+requires:
+  - phase: 04-heatmap-interaction
+    provides: Click navigation and project filter dropdown implementation
+provides:
+  - Vitest test coverage for cell click callback and URL construction
+  - Vitest test coverage for project filter dropdown behavior
+affects: [polish]
+
+tech-stack:
+  added: []
+  patterns: [vi.stubGlobal fetch mocking, window.location capture via Object.defineProperty, vi.waitFor async DOM assertions]
+
+key-files:
+  created:
+    - assets/test/interaction.test.ts
+    - assets/test/filter.test.ts
+  modified: []
+
+key-decisions:
+  - "No architectural decisions -- test-only plan following established patterns"
+
+patterns-established:
+  - "Async init() testing: use vi.waitFor() to wait for fetch resolution before asserting DOM state"
+  - "Location capture: Object.defineProperty(window, 'location') with getter/setter for href testing"
+
+requirements-completed: [TEST-04]
+
+duration: 1min
+completed: 2026-04-08
+---
+
+# Phase 4 Plan 2: Interaction Tests Summary
+
+**Vitest tests for click navigation (cell callback, URL daterange, project filter in URL) and filter dropdown (rendering, fetch params, empty state)**
+
+## Performance
+
+- **Duration:** 1 min
+- **Started:** 2026-04-08T13:33:12Z
+- **Completed:** 2026-04-08T13:34:39Z
+- **Tasks:** 2
+- **Files modified:** 2
+
+## Accomplishments
+- 7 click navigation tests covering onCellClick callback, daterange URL construction, project filter in URL, and fallback URL
+- 9 filter dropdown tests covering rendering, option population, fetch URL params, re-render, accessibility, and filtered empty state
+- All 26 unique tests pass (52 including symlink duplicates), existing 10 heatmap tests unbroken
+
+## Task Commits
+
+Each task was committed atomically:
+
+1. **Task 1: Click navigation tests** - `4b87dbf` (test)
+2. **Task 2: Filter dropdown tests** - `b50972a` (test)
+
+## Files Created/Modified
+- `assets/test/interaction.test.ts` - Click navigation tests: onCellClick callback, init() URL construction with daterange and project filter
+- `assets/test/filter.test.ts` - Filter dropdown tests: rendering, option population, fetch with project param, re-render, empty state message
+
+## Decisions Made
+None - followed plan as specified.
+
+## Deviations from Plan
+
+None - plan executed exactly as written.
+
+## Issues Encountered
+None
+
+## User Setup Required
+None - no external service configuration required.
+
+## Next Phase Readiness
+- Full test coverage for interaction features (click navigation + project filter)
+- Ready for polish phase
+
+---
+*Phase: 04-heatmap-interaction*
+*Completed: 2026-04-08*