feat(frontend): add grooming schedule CRUD page

- New route /routines/grooming-schedule with load + create/update/delete actions
- Entries grouped by day of week with inline editing
- 4 API functions added to api.ts (get/create/update/delete)
- Nav: add Grooming link, fix isActive to not highlight parent when child matches
- Nav: replace ⌂ text char with 🏠 emoji for Dashboard

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

frontend/src/lib/api.ts

@@ -1,6 +1,7 @@
 import { PUBLIC_API_BASE } from '$env/static/public';
 import type {
 	ActiveIngredient,
+	GroomingSchedule,
 	LabResult,
 	MedicationEntry,
 	MedicationUsage,
@@ -129,6 +130,15 @@ export const updateRoutineStep = (stepId: string, body: Record<string, unknown>)
 export const deleteRoutineStep = (stepId: string): Promise<void> =>
 	api.del(`/routines/steps/${stepId}`);
 
+export const getGroomingSchedule = (): Promise<GroomingSchedule[]> =>
+	api.get('/routines/grooming-schedule');
+export const createGroomingScheduleEntry = (body: Record<string, unknown>): Promise<GroomingSchedule> =>
+	api.post('/routines/grooming-schedule', body);
+export const updateGroomingScheduleEntry = (id: string, body: Record<string, unknown>): Promise<GroomingSchedule> =>
+	api.patch(`/routines/grooming-schedule/${id}`, body);
+export const deleteGroomingScheduleEntry = (id: string): Promise<void> =>
+	api.del(`/routines/grooming-schedule/${id}`);
+
 // ─── Health – Medications ────────────────────────────────────────────────────
 
 export interface MedicationListParams {