feat: Replace Syne font with Vend sans for enhanced G readability

assets/fonts/Syne/OFL.txt assets/fonts/Vend_Sans/OFL.txt

···
-Copyright 2017 The Syne Project Authors (https://gitlab.com/bonjour-monde/fonderie/syne-typeface)
+Copyright 2025 The Vend Sans Project Authors (https://github.com/ktkm/Vend-Sans)
 
 This Font Software is licensed under the SIL Open Font License, Version 1.1.
 This license is copied below, and is also available with a FAQ at:

assets/fonts/Syne/README.txt assets/fonts/Vend_Sans/README.txt

···
-Syne Variable Font
-==================
+Vend Sans Variable Font
+=======================
 
-This download contains Syne as both a variable font and static fonts.
+This download contains Vend Sans as both variable fonts and static fonts.
 
-Syne is a variable font with this axis:
+Vend Sans is a variable font with this axis:
   wght
 
-This means all the styles are contained in a single file:
-  Syne/Syne-VariableFont_wght.ttf
+This means all the styles are contained in these files:
+  VendSans-VariableFont_wght.ttf
+  VendSans-Italic-VariableFont_wght.ttf
 
 If your app fully supports variable fonts, you can now pick intermediate styles
 that aren’t available as static fonts. Not all apps support variable fonts, and
-in those cases you can use the static font files for Syne:
-  Syne/static/Syne-Regular.ttf
-  Syne/static/Syne-Medium.ttf
-  Syne/static/Syne-SemiBold.ttf
-  Syne/static/Syne-Bold.ttf
-  Syne/static/Syne-ExtraBold.ttf
+in those cases you can use the static font files for Vend Sans:
+  static/VendSans-Light.ttf
+  static/VendSans-Regular.ttf
+  static/VendSans-Medium.ttf
+  static/VendSans-SemiBold.ttf
+  static/VendSans-Bold.ttf
+  static/VendSans-LightItalic.ttf
+  static/VendSans-Italic.ttf
+  static/VendSans-MediumItalic.ttf
+  static/VendSans-SemiBoldItalic.ttf
+  static/VendSans-BoldItalic.ttf
 
 Get started
 -----------

client/app.css

···
 	/* The Syne Font is used for:
 	*  Main theme
 	*/
-	font-family: "Syne";
-	src: url(/assets/fonts/Syne/Syne-VariableFont_wght.ttf);
+	font-family: "Vend Sans";
+	src: url(/assets/fonts/Vend_Sans/VendSans-VariableFont_wght.ttf);
 }
 
 @font-face {
···
 }
 
 @theme {
-	--font-sans: "Syne";
+	--font-sans: "Vend Sans";
 	--font-logo: "Gantari";
 	--font-content: "Elms Sans";
 	--font-menuitems: "Josefin Sans";
 	--font-script: "DM Mono";
 }
+
 
 @plugin "daisyui" {
 }
···
 	--border: 1px;
 	--depth: 1;
 	--noise: 0;
+	--spacing: 0.5rem;
 }
 
 @plugin "daisyui/theme" {
···
 	--border: 1px;
 	--depth: 1;
 	--noise: 0;
+	--spacing: 0.5rem;
 }
 
 @layer base {