fix: remove AM/PM filter from routines, add keyed each blocks

Remove the All/AM/PM filter buttons and part_of_day param from
the routines list page — date-based sorting/filtering is preferred.

Add missing keyed {#each} blocks across all pages to follow
Svelte 5 best practice (dashboard, products, medications,
lab results, routines list and detail, skin).

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

frontend/src/routes/health/lab-results/+page.svelte

@@ -68,7 +68,7 @@
 			<SelectTrigger class="w-32">{filterFlag || 'All'}</SelectTrigger>
 			<SelectContent>
 				<SelectItem value="">All</SelectItem>
-				{#each flags as f}
+				{#each flags as f (f)}
 					<SelectItem value={f}>{f}</SelectItem>
 				{/each}
 			</SelectContent>
@@ -111,7 +111,7 @@
 							<SelectTrigger>{selectedFlag || 'None'}</SelectTrigger>
 							<SelectContent>
 								<SelectItem value="">None</SelectItem>
-								{#each flags as f}
+								{#each flags as f (f)}
 									<SelectItem value={f}>{f}</SelectItem>
 								{/each}
 							</SelectContent>
@@ -138,7 +138,7 @@
 				</TableRow>
 			</TableHeader>
 			<TableBody>
-				{#each data.results as r}
+				{#each data.results as r (r.id)}
 					<TableRow>
 						<TableCell class="text-sm">{r.collected_at.slice(0, 10)}</TableCell>
 						<TableCell class="font-medium">{r.test_name_original ?? r.test_code}</TableCell>