feat: EntitySelect palette-style entity picker, replace select dropdowns

New EntitySelect component: modal palette with search, keyboard nav,
current-value indicator (left border), smooth overlay. Replaces native
<select> dropdowns for entity selection.

Replaced selects:
- Notification Trackers: provider selector
- Command Trackers: provider + command config selectors
- Command Configs: response template selector
- Targets: telegram bot, email bot, matrix bot selectors

Added reactive $effect watchers for loadCollections and loadBotChats
since EntitySelect uses bind:value instead of onchange.

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

@@ -12,6 +12,7 @@
 	import ConfirmModal from '$lib/components/ConfirmModal.svelte';
 	import IconButton from '$lib/components/IconButton.svelte';
 	import CrossLink from '$lib/components/CrossLink.svelte';
+	import EntitySelect from '$lib/components/EntitySelect.svelte';
 	import { snackSuccess, snackError } from '$lib/stores/snackbar.svelte';
 	import { highlightFromUrl } from '$lib/highlight';
 
@@ -23,6 +24,10 @@
 
 	let configs = $derived(commandConfigsCache.items);
 	let cmdTemplateConfigs = $derived(commandTemplateConfigsCache.items);
+	const templateItems = $derived(cmdTemplateConfigs
+		.filter((c: any) => c.provider_type === form.provider_type)
+		.map((c: any) => ({ value: c.id, label: c.name + (c.user_id === 0 ? ' (System)' : ''), icon: c.icon || 'mdiCodeBracesBox', desc: c.provider_type }))
+	);
 	let loaded = $state(false);
 	let showForm = $state(false);
 	let editing = $state<number | null>(null);
@@ -180,13 +185,8 @@
 			</div>
 
 			<div>
-				<label for="cc-template" class="block text-sm font-medium mb-1">{t('commandConfig.responseTemplate')}</label>
-				<select id="cc-template" bind:value={form.command_template_config_id}
-					class="w-full px-3 py-2 border border-[var(--color-border)] rounded-md text-sm bg-[var(--color-background)]">
-					{#each cmdTemplateConfigs.filter((c: any) => c.provider_type === form.provider_type) as tpl}
-						<option value={tpl.id}>{tpl.name}{tpl.user_id === 0 ? ' (System)' : ''}</option>
-					{/each}
-				</select>
+				<label class="block text-sm font-medium mb-1">{t('commandConfig.responseTemplate')}</label>
+				<EntitySelect items={templateItems} bind:value={form.command_template_config_id} placeholder={t('commandConfig.responseTemplate')} />
 			</div>
 
 			<div class="grid grid-cols-2 sm:grid-cols-4 gap-3">