fix: dashboard provider card shows filtered count, fix provider update 400

- Dashboard providers card now shows count of providers matching the
  global provider type filter instead of special name/type display
- Fix provider update sending empty config when only name/icon changed,
  causing 400 validation error (api_key required)

frontend/src/routes/+page.svelte

@@ -177,12 +177,12 @@
 
 	let displayCommandTrackers = $state(0);
 
-	const filteredProvider = $derived(globalProviderFilter.id ? providers.find(p => p.id === globalProviderFilter.id) : null);
+	const filteredProviderCount = $derived(globalProviderFilter.providerType
+		? providers.filter(p => p.type === globalProviderFilter.providerType).length
+		: displayProviders);
 
 	const statCards = $derived(status ? [
-		filteredProvider
+		{ icon: 'mdiServer', label: 'dashboard.providers', value: filteredProviderCount, color: '#0d9488' },
-			? { icon: providerDefaultIcon(filteredProvider), label: filteredProvider.name, value: filteredProvider.type, color: '#0d9488', isProvider: true }
-			: { icon: 'mdiServer', label: 'dashboard.providers', value: displayProviders, color: '#0d9488' },
 		{ icon: 'mdiRadar', label: 'dashboard.activeTrackers', value: displayActive, suffix: ` / ${displayTotal}`, color: '#6366f1' },
 		{ icon: 'mdiTarget', label: 'dashboard.targets', value: displayTargets, color: '#f59e0b' },
 		...(status.command_trackers !== undefined ? [{ icon: 'mdiConsoleLine', label: 'nav.commandTrackers', value: displayCommandTrackers, color: '#8b5cf6' }] : []),
@@ -238,14 +238,10 @@
 							<MdiIcon name={card.icon} size={22} />
 						</div>
 						<div>
-							<p class="text-sm" style="color: var(--color-muted-foreground);">{card.isProvider ? card.label : t(card.label)}</p>
+							<p class="text-sm" style="color: var(--color-muted-foreground);">{t(card.label)}</p>
-							{#if card.isProvider}
+							<p class="stat-value font-mono" style="animation-delay: {i * 80 + 200}ms;">
-								<p class="text-lg font-medium" style="color: {card.color};">{card.value}</p>
+								{card.value}{#if card.suffix}<span class="stat-suffix">{card.suffix}</span>{/if}
-							{:else}
+							</p>
-								<p class="stat-value font-mono" style="animation-delay: {i * 80 + 200}ms;">
-									{card.value}{#if card.suffix}<span class="stat-suffix">{card.suffix}</span>{/if}
-								</p>
-							{/if}
 						</div>
 					</div>
 				</div>

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

@@ -106,7 +106,14 @@
 				}
 			}
 			if (editing) {
-				await api(`/providers/${editing}`, { method: 'PUT', body: JSON.stringify({ name: form.name, icon: form.icon, config }) });
+				// Only send config if user changed a config field (secrets are blank on edit)
+				const hasConfigChange = form.url !== (providers.find(p => p.id === editing)?.config?.url || '') ||
+					(form.type === 'immich' && (form.api_key || form.external_domain !== (providers.find(p => p.id === editing)?.config?.external_domain || ''))) ||
+					(form.type === 'gitea' && (form.api_token || form.webhook_secret)) ||
+					(form.type === 'planka' && (form.api_key || form.webhook_secret));
+				const body: any = { name: form.name, icon: form.icon };
+				if (hasConfigChange) body.config = config;
+				await api(`/providers/${editing}`, { method: 'PUT', body: JSON.stringify(body) });
 			} else {
 				await api('/providers', { method: 'POST', body: JSON.stringify({ type: form.type, name: form.name, icon: form.icon, config }) });
 			}