docs(07-02): complete week mode renderer plan

.planning/phases/07-mode-switcher-week-mode/07-02-SUMMARY.md

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+---
+phase: 07-mode-switcher-week-mode
+plan: 02
+subsystem: ui
+tags: [d3, typescript, heatmap, week-mode, aggregation]
+
+requires:
+  - phase: 06-renderer-architecture
+    provides: ModeRenderer interface, registry, shared color-scale/tooltip/date-utils
+  - phase: 07-mode-switcher-week-mode plan 01
+    provides: Mode switcher controls, metric toggle, doRender dispatch
+provides:
+  - WeekModeRenderer aggregating DayEntry data by weekday into 7-cell horizontal heatmap
+  - Week mode registered and dispatch-ready via orchestrator
+affects: [08-day-mode, 09-combined-mode]
+
+tech-stack:
+  added: []
+  patterns: [weekday aggregation with dayCount tracking, synthetic DayEntry for color scale domain]
+
+key-files:
+  created:
+    - assets/src/renderers/week.ts
+    - assets/test/week.test.ts
+  modified:
+    - assets/src/heatmap.ts
+
+key-decisions:
+  - "Labels placed centered above each cell (horizontal layout) rather than in a left column (vertical layout) since week mode is a single horizontal row"
+
+patterns-established:
+  - "Aggregation renderer pattern: aggregate DayEntry[] -> synthetic DayEntry[] for buildColorScale, render cells from aggregates"
+
+requirements-completed: [VIZ-02, TEST-01]
+
+duration: 4min
+completed: 2026-04-09
+---
+
+# Phase 7 Plan 02: Week Mode Renderer Summary
+
+**WeekModeRenderer aggregates time entries by weekday into 7 horizontal SVG cells with color scale, metric toggle, and weekStart-aware ordering**
+
+## Performance
+
+- **Duration:** 4 min
+- **Started:** 2026-04-09T14:29:19Z
+- **Completed:** 2026-04-09T14:33:19Z
+- **Tasks:** 1 of 2 (Task 2 is human-verify checkpoint)
+- **Files modified:** 3
+
+## Accomplishments
+- WeekModeRenderer implements ModeRenderer with aggregateByWeekday logic summing hours/count per weekday
+- 7-cell SVG with color scale from buildColorScale, empty cells get heatmap-empty class
+- Tooltips show full weekday name with hours-first or count-first format depending on metric
+- Labels respect weekStart preference (Monday-first or Sunday-first ordering)
+- Registered in heatmap.ts for dispatch via mode switcher
+- 14 tests covering aggregation, rendering, tooltips, empty state, label ordering
+
+## Task Commits
+
+Each task was committed atomically:
+
+1. **Task 1 RED: Failing tests for week renderer** - `7fba98f` (test)
+2. **Task 1 GREEN+REFACTOR: Week mode renderer implementation** - `9dde529` (feat)
+
+## Files Created/Modified
+- `assets/src/renderers/week.ts` - WeekModeRenderer with aggregateByWeekday, 7-cell SVG, tooltips (149 lines)
+- `assets/test/week.test.ts` - 14 tests covering mode, rendering, aggregation, tooltips, labels, destroy (178 lines)
+- `assets/src/heatmap.ts` - Added WeekModeRenderer import and registration
+
+## Decisions Made
+- Labels placed centered above each cell in horizontal layout rather than in a left column, since the 7-cell week view is a single horizontal row
+- Used synthetic DayEntry array from non-zero aggregates to feed buildColorScale, keeping color domain based on actual data values
+
+## Deviations from Plan
+
+None - plan executed exactly as written.
+
+## Issues Encountered
+None.
+
+## User Setup Required
+None - no external service configuration required.
+
+## Next Phase Readiness
+- Task 2 (human-verify checkpoint) pending -- requires visual verification in running Kimai instance
+- Week mode renderer is code-complete and all tests pass
+- Ready for day-mode renderer (phase 08) once visual verification confirms correctness