fix(frontend): resolve TypeScript type errors from skin model refactor

- Remove s.trend from dashboard (field removed from SkinConditionSnapshot)
- Replace trend with texture in SkinPhotoAnalysisResponse (api.ts)
- Use record_id instead of id for LabResult and MedicationEntry keyed each blocks

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

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

@@ -137,7 +137,7 @@
 				</TableRow>
 			</TableHeader>
 			<TableBody>
-				{#each data.results as r (r.id)}
+				{#each data.results as r (r.record_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>