feat: rich command templates with public links + media text-first flow

- Command templates now match notification template style: type icons,
  linked filenames via album shared links, location, favorite status
- Media mode sends text message first, then media as reply (was media-only)
- Search/find/person/place resolve asset public URLs from tracked albums'
  shared links (share/{key}/photos/{id})
- Albums/summary commands include album public_url in context
- Enriched command template preview sample context with public_url, city,
  country, is_favorite
- Extract sanitizePreview to shared lib/sanitize.ts
- Command template preview now renders HTML links (was raw text)
- Global provider filter moved above search in sidebar
- CLAUDE.md: template consistency + context variable sync rules

frontend/src/routes/command-template-configs/+page.svelte

@@ -3,6 +3,7 @@
 	import { slide } from 'svelte/transition';
 	import { api } from '$lib/api';
 	import { t } from '$lib/i18n';
+	import { sanitizePreview } from '$lib/sanitize';
 	import { commandTemplateConfigsCache } from '$lib/stores/caches.svelte';
 	import PageHeader from '$lib/components/PageHeader.svelte';
 	import Card from '$lib/components/Card.svelte';
@@ -318,7 +319,7 @@
 						{/if}
 						{#if slotPreview[slot.name] && !slotErrors[slot.name]}
 							<div class="mt-1 p-2 bg-[var(--color-muted)] rounded text-sm">
-								<pre class="whitespace-pre-wrap text-xs">{slotPreview[slot.name]}</pre>
+								<pre class="whitespace-pre-wrap text-xs">{@html sanitizePreview(slotPreview[slot.name])}</pre>
 							</div>
 						{/if}
 					</div>