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/lib/themes/theme-config.ts

@@ -26,28 +26,28 @@ export const themes: ThemeDefinition[] = [
   {
     id: "default",
     name: "Default",
-    description: "Vibrant iOS system colors",
+    description: "Warm orange with teal accents",
     light: {
-      primary: "#0079FF",
-      secondary: "#5AC7F9",
-      accent: "#FF9400",
-      error: "#FF3A2F",
+      primary: "#E07A3A",
+      secondary: "#0D7C66",
+      accent: "#D4A574",
+      error: "#DC2626",
       bgPrimary: "#FFFFFF",
-      bgSecondary: "#F1F7F7",
-      textPrimary: "#111111",
-      textSecondary: "#3C3C3C",
+      bgSecondary: "#F7F7F7",
+      textPrimary: "#1C1917",
+      textSecondary: "#78716C",
       textOnPrimary: "#FFFFFF",
     },
     dark: {
-      primary: "#0984FF",
-      secondary: "#63D2FF",
-      accent: "#FF9F09",
-      error: "#FF4539",
-      bgPrimary: "#1C1C1C",
-      bgSecondary: "#2C2C2C",
-      textPrimary: "#FFFFFF",
-      textSecondary: "#EBEBEB",
-      textOnPrimary: "#FFFFFF",
+      primary: "#F0A070",
+      secondary: "#4FC9AF",
+      accent: "#DDB892",
+      error: "#EF4444",
+      bgPrimary: "#0A0A0A",
+      bgSecondary: "#161616",
+      textPrimary: "#FAFAFA",
+      textSecondary: "#A1A1A1",
+      textOnPrimary: "#0A0A0A",
     },
   },
   {