feat(trackers): user filters for Gitea, webhook polling cleanup, dashboard navigability

- Gitea: NotificationTracker now exposes sender allowlist / blocklist filters
  via MultiEntitySelect, populated from Gitea /users/search merged with past
  EventLog senders so the picker is useful before the first webhook arrives.
- Webhook providers (gitea, planka, webhook): stop scheduling interval polling
  jobs on tracker create/update/startup; hide the "every Xs" indicator in the
  tracker list since there is no polling.
- Dashboard: stat cards are now <a> links that route to providers, trackers,
  targets, command-trackers, or scroll to the events panel. Provider deck
  rows highlight the target provider on click.
- Command trackers / command configs: auto-reselect the right config when the
  provider type changes (matches notification-tracker behavior).
- Migration: drop legacy batch_duration column from notification_tracker —
  the field is gone from the model but its NOT NULL constraint blocked
  inserts on older DBs.
- Docs: refresh entity-relationships.md with current NotificationTracker
  fields (filters, adaptive_max_skip, default_*_config_id).

frontend/src/routes/notification-trackers/+page.svelte

@@ -46,6 +46,7 @@
 	let trackingConfigs = $derived(trackingConfigsCache.items);
 	let templateConfigs = $derived(templateConfigsCache.items);
 	let collections = $state<Record<string, any>[]>([]);
+	let users = $state<{ id: string; name: string }[]>([]);
 	let showForm = $state(false);
 	let editing = $state<number | null>(null);
 	let collectionFilter = $state('');
@@ -167,22 +168,38 @@
 		try { collections = await api(`/providers/${form.provider_id}/collections`); } catch (e) { console.warn('Failed to load collections:', e); collections = []; }
 	}
 
+	async function loadUsers() {
+		if (!form.provider_id) { users = []; return; }
+		// Skip the fetch when the descriptor has no user filters — saves a
+		// pointless round-trip for providers like Immich/Scheduler.
+		const desc = getDescriptor(selectedProviderType);
+		if (!desc?.userFilters || desc.userFilters.length === 0) { users = []; return; }
+		try { users = await api(`/providers/${form.provider_id}/users`); }
+		catch (e) { console.warn('Failed to load users:', e); users = []; }
+	}
+
 	let _prevProviderId = $state(0);
 	$effect(() => {
 		if (showForm && form.provider_id && form.provider_id !== _prevProviderId) {
 			_prevProviderId = form.provider_id;
 			loadCollections();
-			// Auto-select first available tracking/template config for this provider when creating
+			loadUsers();
+			// Re-pick tracking/template configs for the new provider type. The
+			// previously-selected ids may belong to a different provider type
+			// and therefore no longer appear in the filtered EntitySelect list,
+			// which would render the selector as empty.
 			if (editing === null) {
 				const ptype = providers.find(p => p.id === form.provider_id)?.type || '';
 				if (ptype) {
-					if (!form.default_tracking_config_id) {
+					const currentTc = trackingConfigs.find(c => c.id === form.default_tracking_config_id);
+					if (!currentTc || currentTc.provider_type !== ptype) {
 						const first = trackingConfigs.find(c => c.provider_type === ptype);
-						if (first) form.default_tracking_config_id = first.id;
+						form.default_tracking_config_id = first?.id ?? 0;
 					}
-					if (!form.default_template_config_id) {
+					const currentTpl = templateConfigs.find(c => c.id === form.default_template_config_id);
+					if (!currentTpl || currentTpl.provider_type !== ptype) {
 						const first = templateConfigs.find(c => c.provider_type === ptype);
-						if (first) form.default_template_config_id = first.id;
+						form.default_template_config_id = first?.id ?? 0;
 					}
 				}
 			}
@@ -193,7 +210,7 @@
 		form = defaultForm();
 		// Auto-select first provider if any
 		if (providers.length > 0) form.provider_id = providers[0].id;
-		editing = null; showForm = true; collections = []; previousCollectionIds = [];
+		editing = null; showForm = true; collections = []; users = []; previousCollectionIds = [];
 	}
 
 	async function edit(trk: Tracker) {
@@ -208,7 +225,9 @@
 		};
 		previousCollectionIds = [...(trk.collection_ids || [])];
 		editing = trk.id; showForm = true;
-		if (form.provider_id) await loadCollections();
+		if (form.provider_id) {
+			await Promise.all([loadCollections(), loadUsers()]);
+		}
 	}
 
 	async function save(e: SubmitEvent) {
@@ -460,6 +479,7 @@
 		bind:form
 		{providerItems}
 		{collections}
+		{users}
 		bind:collectionFilter
 		trackingConfigItems={trackingConfigs.filter(c => !selectedProviderType || c.provider_type === selectedProviderType).map(c => ({ value: c.id, label: c.name, icon: (c as any).icon || 'mdiCog' }))}
 		templateConfigItems={templateConfigs.filter(c => !selectedProviderType || c.provider_type === selectedProviderType).map(c => ({ value: c.id, label: c.name, icon: (c as any).icon || 'mdiFileDocumentEdit' }))}
@@ -499,6 +519,7 @@
 {:else if !showForm}
 	<div class="space-y-3 stagger-children">
 		{#each notificationTrackers as tracker (tracker.id)}
+			{@const trkDesc = getDescriptor(getProviderType(tracker))}
 			<Card hover entityId={tracker.id}>
 				<div class="flex items-center justify-between">
 					<div>
@@ -511,7 +532,9 @@
 						<CrossLink href="/providers" icon="mdiServer" label={getProviderName(tracker.provider_id)} entityId={tracker.provider_id} />
 						</div>
 						<p class="text-sm text-[var(--color-muted-foreground)]">
-							{(tracker.collection_ids || []).length} {getCollectionLabel(tracker)} · {t('notificationTracker.every')} {tracker.scan_interval}s · {(tracker.tracker_targets || []).length} {t('notificationTracker.linkedTargets')}
+							{(tracker.collection_ids || []).length} {getCollectionLabel(tracker)} ·
+							{#if !trkDesc?.webhookBased}{t('notificationTracker.every')} {tracker.scan_interval}s ·{/if}
+							{(tracker.tracker_targets || []).length} {t('notificationTracker.linkedTargets')}
 						</p>
 					</div>
 					<div class="flex items-center gap-1 flex-wrap justify-end">