feat: redesign app UI — top nav, clean dashboard, warm branding

- Replace sidebar with top navigation bar (like Airbnb/Nextdoor)
- Redesign dashboard: home cards, coming up tasks, quick action pills
- Remove widget-heavy layout (charts, stats, activity feed)
- Add landing page with hero, features, how-it-works, CTA sections
- Update auth pages with split layout
- Clean white theme with neutral grays, brand orange/teal accents
- Friendly copy across all empty states and page headers
- Add Bricolage Grotesque + Outfit fonts
- Default to light mode

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

src/components/shared/empty-state.tsx

@@ -11,12 +11,16 @@ interface EmptyStateProps {
 
 export function EmptyState({ icon: Icon, title, description, actionLabel, onAction }: EmptyStateProps) {
   return (
-    <div className="flex flex-col items-center justify-center py-16 text-center">
-      <div className="rounded-full bg-muted p-4 mb-4"><Icon className="size-8 text-muted-foreground" /></div>
-      <h3 className="text-lg font-semibold">{title}</h3>
-      <p className="text-muted-foreground mt-1 max-w-sm">{description}</p>
+    <div className="flex flex-col items-center justify-center py-20 text-center">
+      <div className="size-16 rounded-2xl bg-[#FFF3EB] flex items-center justify-center mb-5">
+        <Icon className="size-7 text-[#E07A3A]" />
+      </div>
+      <h3 className="font-heading text-lg font-bold">{title}</h3>
+      <p className="text-sm text-muted-foreground mt-2 max-w-sm leading-relaxed">{description}</p>
       {actionLabel && onAction && (
-        <Button onClick={onAction} className="mt-4"><Plus className="size-4 mr-2" />{actionLabel}</Button>
+        <Button onClick={onAction} className="mt-6 rounded-xl shadow-sm shadow-primary/20">
+          <Plus className="size-4 mr-2" />{actionLabel}
+        </Button>
       )}
     </div>
   );