feat: UX & notification improvements — icons, events, chat names, link validation, templates

- Show entity icons on all cards with fallback defaults (providers, trackers, targets, bots)
- Enrich EventLog with provider_name, tracker_name, assets_count; add DB migration
- Dashboard events: filtering (type, provider, search), sorting, pagination, dynamic page size
- Friendly chat names on telegram target cards (resolve from TelegramChat table)
- Test message button on bot chat items with locale-aware messages
- Album public link validation on tracker save with auto-create dialog
- Support albums without public links: conditional <a href> in templates
- Fetch shared links during poll, enrich events with public_url/protected_url
- Per-asset public_url in template context ({share_url}/photos/{asset_id})
- Common date/location detection: common_date + common_location context vars
- Dual date formats: date_format (datetime) + date_only_format (date only)
- Template clone button, HTML link rendering in template preview
- Fix Telegram asset download 401: pass x-api-key headers through client
- Fix provider external_url matching for API key scoping
- Fix event timestamp timezone (append Z suffix for UTC)
- Localize event filter controls, test messages (EN/RU)
- Template variable UI helpers updated with all new fields
- CLAUDE.md: template system sync rules documentation

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

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

@@ -2,7 +2,7 @@
 	import { onMount } from 'svelte';
 	import { slide } from 'svelte/transition';
 	import { api } from '$lib/api';
-	import { t } from '$lib/i18n';
+	import { t, getLocale } from '$lib/i18n';
 	import PageHeader from '$lib/components/PageHeader.svelte';
 	import Card from '$lib/components/Card.svelte';
 	import Loading from '$lib/components/Loading.svelte';
@@ -94,7 +94,7 @@
 	}
 	async function test(id: number) {
 		try {
-			const res = await api(`/targets/${id}/test`, { method: 'POST' });
+			const res = await api(`/targets/${id}/test?locale=${getLocale()}`, { method: 'POST' });
 			if (res.success) snackSuccess(t('snack.targetTestSent'));
 			else snackError(`Failed: ${res.error}`);
 		} catch (err: any) { snackError(err.message); }
@@ -235,12 +235,16 @@
 				<div class="flex items-center justify-between">
 					<div>
 						<div class="flex items-center gap-2">
-							{#if target.icon}<MdiIcon name={target.icon} />{/if}
+							<span style="color: var(--color-primary);"><MdiIcon name={target.icon || (target.type === 'telegram' ? 'mdiSend' : 'mdiWebhook')} size={20} /></span>
 							<p class="font-medium">{target.name}</p>
 							<span class="text-xs px-1.5 py-0.5 rounded bg-[var(--color-muted)] text-[var(--color-muted-foreground)]">{target.type}</span>
 						</div>
 						<p class="text-sm text-[var(--color-muted-foreground)]">
-							{target.type === 'telegram' ? `Chat: ${target.config?.chat_id || '***'}` : target.config?.url || ''}
+							{#if target.type === 'telegram'}
+								Chat: {#if target.chat_name}{target.chat_name} <span class="font-mono text-xs">({target.config?.chat_id})</span>{:else}{target.config?.chat_id || '***'}{/if}
+							{:else}
+								{target.config?.url || ''}
+							{/if}
 						</p>
 					</div>
 					<div class="flex items-center gap-1">