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.planning/phases/02-dashboard-charts-and-layout/02-01-SUMMARY.md

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+---
+phase: 02-dashboard-charts-and-layout
+plan: 01
+subsystem: ui
+tags: [react-router, useSearchParams, select, lucide-react, i18n]
+
+# Dependency graph
+requires:
+  - phase: 01-design-foundation-and-primitives
+    provides: "Design tokens, PageShell, SummaryStrip, ChartEmptyState component"
+provides:
+  - "useMonthParam hook for URL-based month state"
+  - "MonthNavigator component with prev/next arrows and month dropdown"
+  - "i18n keys for chart labels and month navigation (EN + DE)"
+affects: [02-02, 02-03, dashboard-page-refactor]
+
+# Tech tracking
+tech-stack:
+  added: []
+  patterns: [URL search param state via useMonthParam, locale-aware month formatting]
+
+key-files:
+  created:
+    - src/hooks/useMonthParam.ts
+    - src/components/dashboard/MonthNavigator.tsx
+  modified:
+    - src/i18n/en.json
+    - src/i18n/de.json
+
+key-decisions:
+  - "MonthNavigator uses Select dropdown (not popover) for month jump -- consistent with existing form patterns"
+  - "formatMonthLabel uses Date.toLocaleDateString for locale-aware month display"
+  - "ChartEmptyState already existed from Phase 1 -- no changes needed"
+
+patterns-established:
+  - "useMonthParam: URL state hook pattern using useSearchParams callback form to preserve other params"
+  - "MonthNavigator accepts t() prop for presentational i18n (Phase 1 pattern continued)"
+
+requirements-completed: [UI-DASH-01]
+
+# Metrics
+duration: 2min
+completed: 2026-03-16
+---
+
+# Phase 2 Plan 1: Month Navigation and Chart Infrastructure Summary
+
+**URL-based month navigation hook with MonthNavigator dropdown/arrows and chart i18n keys in EN/DE**
+
+## Performance
+
+- **Duration:** 2 min
+- **Started:** 2026-03-16T12:01:18Z
+- **Completed:** 2026-03-16T12:03:21Z
+- **Tasks:** 2
+- **Files modified:** 4
+
+## Accomplishments
+- useMonthParam hook reads/writes `?month=YYYY-MM` from URL with current month fallback and year-rollover-safe navigation
+- MonthNavigator renders prev/next chevron buttons and a Select dropdown listing available budget months with locale-aware formatting
+- Added 10 new i18n keys under `dashboard.*` for chart labels, month navigation, and empty states in both English and German
+
+## Task Commits
+
+Each task was committed atomically:
+
+1. **Task 1: Create useMonthParam hook and MonthNavigator component** - `4481950` (feat)
+2. **Task 2: Add chart and month navigation i18n keys** - `42bf1f9` (feat)
+
+## Files Created/Modified
+- `src/hooks/useMonthParam.ts` - Custom hook wrapping useSearchParams for month URL state with setMonth and navigateMonth
+- `src/components/dashboard/MonthNavigator.tsx` - Prev/next arrow buttons + Select dropdown for month selection
+- `src/i18n/en.json` - Added monthNav, noData, expenseDonut, incomeChart, spendChart, budgeted, actual, noBudgetForMonth, createBudget, generateFromTemplate keys
+- `src/i18n/de.json` - German translations for all 10 new dashboard keys
+
+## Decisions Made
+- MonthNavigator uses the shadcn Select component (not a popover or custom dropdown) for month selection -- consistent with existing form patterns in the project
+- formatMonthLabel uses `Date.toLocaleDateString(undefined, { month: "long", year: "numeric" })` for locale-aware month display rather than manual string formatting
+- ChartEmptyState component was already created during Phase 1 scaffolding -- verified it matches the plan specification exactly, so no changes were needed
+
+## Deviations from Plan
+
+None - plan executed exactly as written. ChartEmptyState already existed from Phase 1, which is expected since the charts directory was scaffolded earlier.
+
+## Issues Encountered
+None
+
+## User Setup Required
+None - no external service configuration required.
+
+## Next Phase Readiness
+- useMonthParam hook ready for consumption by DashboardPage refactor (Plan 03)
+- MonthNavigator ready to be placed in PageShell action slot (Plan 03)
+- ChartEmptyState ready for use in chart components (Plans 02)
+- All chart i18n keys available for chart components (Plan 02)
+
+## Self-Check: PASSED
+
+- FOUND: src/hooks/useMonthParam.ts
+- FOUND: src/components/dashboard/MonthNavigator.tsx
+- FOUND: src/components/dashboard/charts/ChartEmptyState.tsx
+- FOUND: .planning/phases/02-dashboard-charts-and-layout/02-01-SUMMARY.md
+- FOUND: commit 4481950
+- FOUND: commit 42bf1f9
+
+---
+*Phase: 02-dashboard-charts-and-layout*
+*Completed: 2026-03-16*