feat(redesign): roll subpage hero across all pages + Aurora Button + JinjaEditor + pulse fix

Big batch — every secondary page now wears the same glass-card hero
that landed on Providers earlier:

- notification-trackers, tracking-configs, template-configs
- command-trackers, command-configs, command-template-configs
- targets (with active-tab title), actions
- bots (telegram / email / matrix tabs)
- settings, settings/backup, users

Each page picks an italic-em emphasis word, an editorial crumb (e.g.
'Routing · Notification', 'Operators · Bots', 'System · Maintenance'),
a count meter, and entity-specific status pills derived from live
data: 'X armed / Y paused' for trackers and actions, 'X types' for
configs/templates, 'X channels' or '$N receivers' for targets.

Other changes in this commit:

- Button.svelte: redesigned. Primary variant becomes a real Aurora
  CTA — gradient lavender → orchid pill, 40px tall md / 34px sm,
  inset highlight, lift + glow on hover. Secondary, danger, ghost
  variants reworked to match. The 'Add <Type>' button on every page
  now reads as the page's primary action instead of a flat lavender
  rectangle.
- JinjaEditor: overrode oneDark's hardcoded background with
  !important so the editor surface picks up var(--color-input-bg).
  Gutters / scroller / selection / autocomplete tooltip all match
  Aurora glass tokens now. Template editors stop visually clashing
  with the surrounding panel.
- Aurora pulse dot: rewritten as a self-contained box-shadow glow
  pulse (no transform, no pseudo-element). The dot's bounding box is
  now stable so ancestors with overflow:hidden can never clip the
  visible dot — only the (decorative) outer glow halo. Fixes the
  'half-moon clipping' on the dashboard 'On watch' deck.
- topbar-action.svelte.ts left in tree but unused (topbar CTA was
  reverted per your call). Will clean up in a later commit.
- Form input baseline styling moved into app.css (rounded 0.625rem,
  glass background, hover/focus rings) so untouched filter inputs
  on the per-type pages stop looking out of place.

i18n: emphasis / countLabel / armed / paused / receiver / receivers
/ channelsCount keys added across en + ru.

Build clean: 0 errors, 61 pre-existing a11y warnings unchanged.

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

@@ -19,6 +19,8 @@
 
 	const gridItemSources: Record<string, () => any[]> = { webhookAuthModeItems };
 	import { globalProviderFilter } from '$lib/stores/provider-filter.svelte';
+	import { topbarAction } from '$lib/stores/topbar-action.svelte';
+	import { onDestroy } from 'svelte';
 	import { snackSuccess, snackError } from '$lib/stores/snackbar.svelte';
 	import { highlightFromUrl } from '$lib/highlight';
 	import { getDescriptor, buildProviderFormDefaults } from '$lib/providers';
@@ -68,7 +70,14 @@
 		return pills;
 	});
 
-	onMount(load);
+	onMount(() => {
+		topbarAction.set({
+			label: t('providers.addProvider'),
+			onclick: () => { showForm ? (showForm = false, editing = null) : openNew(); },
+		});
+		load();
+	});
+	onDestroy(() => topbarAction.clear());
 	async function load() {
 		try {
 			await providersCache.fetch(true);