Redesign home dashboard and app shell to match Mento mockup.

Co-authored-by: Cursor <cursoragent@cursor.com>

apps/web/src/styles/main.css

@@ -1,14 +1,14 @@
 :root {
-  --bg: #eef2f0;
+  --bg: #f4f7f8;
   --surface: #ffffff;
-  --ink: #17211c;
-  --muted: #5b6b63;
-  --line: #d5ddd8;
-  --accent: #0f6b5c;
-  --accent-soft: #d8efe9;
+  --ink: #0f172a;
+  --muted: #64748b;
+  --line: #e2e8f0;
+  --accent: #0d9488;
+  --accent-soft: #ccfbf1;
   --danger: #b42318;
-  --shadow: 0 10px 30px rgba(23, 33, 28, 0.06);
-  --radius: 14px;
+  --shadow: 0 8px 24px rgba(15, 23, 42, 0.06);
+  --radius: 18px;
   --font: "Vazirmatn", Tahoma, sans-serif;
 }
 
@@ -31,9 +31,7 @@ body {
   margin: 0;
   font-family: var(--font);
   color: var(--ink);
-  background:
-    radial-gradient(circle at top left, rgba(15, 107, 92, 0.08), transparent 28%),
-    linear-gradient(180deg, #f7faf8 0%, var(--bg) 100%);
+  background: var(--bg);
   overflow-x: clip;
 }