feat : date filter, project drawer, and misc frontend improvements

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

docs/superpowers/specs/2026-03-15-date-filter-design.md

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+# Date Filter Component - Design Spec
+
+## Summary
+
+Add a reusable date filter component to the time-tracking page using `@vuepic/vue-datepicker`. Allows filtering by single day or date range via text input and mini calendar dropdown.
+
+## Behavior
+
+- **Single click** on a day = select that day
+- **Second click** on another day = select range between the two dates
+- **Text input**: type a date (`15/03/2026`) or a range (`15/03/2026 - 20/03/2026`)
+- **Calendar dropdown**: opens on input click/focus
+- **Quick shortcuts**: "Aujourd'hui" and "Cette semaine" buttons in calendar
+- **No time picker**: filter by day granularity only
+- **Format**: `dd/MM/yyyy` (French locale)
+
+## Component: `DateFilter.vue`
+
+Location: `frontend/components/ui/DateFilter.vue`
+
+### Props
+
+| Prop | Type | Default | Description |
+|------|------|---------|-------------|
+| `modelValue` | `Date \| [Date, Date] \| null` | `null` | Selected date or range |
+| `placeholder` | `string` | `t('common.dateFilter')` | Input placeholder |
+
+### Emits
+
+| Event | Payload | Description |
+|-------|---------|-------------|
+| `update:modelValue` | `Date \| [Date, Date] \| null` | Date selection changed |
+
+### Implementation
+
+- Wraps `VueDatePicker` with project-consistent styling
+- Uses `#dp-input` slot for custom input matching MalioSelect style
+- Configures `range` mode with `multi-calendars: false`
+- Sets `text-input` with `format: 'dd/MM/yyyy'`, `rangeSeparator: ' - '`
+- Disables time picker (`enable-time-picker: false`)
+- Applies project primary color (`#222783`) via CSS overrides
+- Responsive width: `!w-44 sm:!w-52`
+
+## Integration: Time Tracking Page
+
+### Filter bar addition
+
+Add `DateFilter` to the existing filter bar in `frontend/pages/time-tracking.vue`, alongside user/project/tag filters.
+
+### Filtering logic
+
+- Client-side filtering (same pattern as project and tag filters)
+- When a single date is selected: show only entries matching that day
+- When a range is selected: show entries within the range (inclusive)
+- When null: show all entries (no date filter)
+
+## Files Impacted
+
+| File | Action | Description |
+|------|--------|-------------|
+| `frontend/components/ui/DateFilter.vue` | Create | Reusable date filter wrapper |
+| `frontend/nuxt.config.ts` | Modify | Add `@vuepic/vue-datepicker` to `build.transpile` |
+| `frontend/pages/time-tracking.vue` | Modify | Integrate DateFilter in filter bar + client-side filtering |
+| `frontend/i18n/locales/fr.json` | Modify | Add French translations |
+| `frontend/i18n/locales/en.json` | Modify | Add English translations |
+| `package.json` | Modify | Add `@vuepic/vue-datepicker` dependency |
+
+## i18n Keys
+
+```json
+{
+    "common": {
+        "dateFilter": "Date",
+        "today": "Aujourd'hui",
+        "thisWeek": "Cette semaine"
+    }
+}
+```
+
+## Style
+
+- Input height and borders match MalioSelect components
+- Text size: `text-sm`
+- Selected date highlight: project primary color `#222783`
+- Calendar dropdown: subtle shadow, rounded corners matching project style
+- Override default vue-datepicker CSS variables to match project theme