v12 (#5712)

Co-authored-by: MeiMei <30769358+mei23@users.noreply.github.com>
Co-authored-by: Satsuki Yanagi <17376330+u1-liquid@users.noreply.github.com>

src/client/themes/urban.json5

@@ -0,0 +1,18 @@
+{
+	id: 'b9392635-8c3d-4397-aaf7-796e49781899',
+
+	name: 'Urban',
+	author: 'syuilo',
+
+	base: 'dark',
+
+	props: {
+		accent: 'rgb(212, 104, 48)',
+		panel: 'rgb(38, 44, 53)',
+		bg: 'rgb(26, 29, 33)',
+		fg: 'rgb(199, 209, 216)',
+		shadow: 'rgba(0, 0, 0, 0.2)',
+		header: 'rgba(51, 64, 72, 0.75)',
+		renote: '@accent',
+	},
+}