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.sisyphus/notepads/date-navigation/learnings.md

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+# Date Navigation Implementation Learnings
+
+## Implementation Details
+- Added left/right arrow navigation to both `StatisticsView.vue` and `BudgetView.vue`
+- Used `<van-icon name="arrow-left" />` and `<van-icon name="arrow" />` for directional arrows
+- Text center remains clickable for date picker popup
+- Arrows use `@click.stop` to prevent event propagation
+
+## StatisticsView.vue
+- `navigateDate(direction)` method handles both month and year modes
+- Month mode: handles year boundaries (Jan -> Dec of previous year, Dec -> Jan of next year)
+- Year mode: increments/decrements year directly
+- Resets `showAllExpense` state on navigation
+
+## BudgetView.vue
+- `navigateDate(direction)` uses native Date object manipulation
+- `setMonth()` automatically handles month/year boundaries
+- Updates `selectedDate` ref which triggers data fetching via watcher
+
+## Styling
+- Added `.nav-date-picker` with flex layout and 12px gap
+- `.nav-date-text` for clickable center text
+- `.nav-arrow` with 8px horizontal padding for touch-friendly targets
+- Active state opacity transition for visual feedback
+- Arrow font size: 18px for clear visibility
+
+## Key Decisions
+- Used `@click.stop` on arrows to prevent opening date picker
+- Centered layout preserved (van-nav-bar default behavior)
+- Consistent styling across both views
+- Touch-friendly padding for mobile UX
+
+## Verification
+- ESLint: No new errors introduced
+- Build: Successful compilation
+- Date math: Correctly handles month/year boundaries