fix(frontend): fix routines list crash and AI save redirect

- Make Routine.steps optional in types.ts — list endpoint does not
  eager-load steps, so the field is absent from the JSON response
- Guard routine.steps?.length ?? 0 in routines list page to prevent
  SSR TypeError when steps is undefined
- Move redirect() outside try/catch in suggest save action; SvelteKit
  redirect throws internally and was being caught, causing a 500 error
  instead of navigating to the new routine

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

frontend/src/lib/types.ts

@@ -181,7 +181,7 @@ export interface Routine {
 	notes?: string;
 	created_at: string;
 	updated_at: string;
-	steps: RoutineStep[];
+	steps?: RoutineStep[];
 }
 
 export interface GroomingSchedule {

frontend/src/routes/routines/+page.svelte

@@ -47,7 +47,7 @@
 									<Badge variant={routine.part_of_day === 'am' ? 'default' : 'secondary'}>
 										{routine.part_of_day.toUpperCase()}
 									</Badge>
-									<span class="text-sm">{routine.steps.length} steps</span>
+									<span class="text-sm">{routine.steps?.length ?? 0} steps</span>
 								</div>
 								{#if routine.notes}
 									<span class="text-sm text-muted-foreground truncate max-w-xs">{routine.notes}</span>

frontend/src/routes/routines/suggest/+page.server.ts

@@ -74,8 +74,10 @@ export const actions: Actions = {
 			return fail(400, { error: 'Nieprawidłowy format kroków.' });
 		}
 
+		let routineId: string;
 		try {
 			const routine = await createRoutine({ routine_date, part_of_day });
+			routineId = routine.id;
 			for (let i = 0; i < steps.length; i++) {
 				const s = steps[i];
 				await addRoutineStep(routine.id, {
@@ -87,10 +89,10 @@ export const actions: Actions = {
 					region: s.region || undefined
 				});
 			}
-			redirect(303, `/routines/${routine.id}`);
 		} catch (e) {
 			return fail(500, { error: (e as Error).message });
 		}
+		redirect(303, `/routines/${routineId}`);
 	},
 
 	saveBatch: async ({ request }) => {