refactor: standardize quotation marks across all files and improve code consistency

styles/globals.css

@@ -1,5 +1,5 @@
-@import 'tailwindcss';
-@import 'tw-animate-css';
+@import "tailwindcss";
+@import "tw-animate-css";
 
 @custom-variant dark (&:is(.dark *));
 
@@ -75,8 +75,8 @@
 }
 
 @theme inline {
-  --font-sans: 'Geist', 'Geist Fallback';
-  --font-mono: 'Geist Mono', 'Geist Mono Fallback';
+  --font-sans: "Geist", "Geist Fallback";
+  --font-mono: "Geist Mono", "Geist Mono Fallback";
   --color-background: var(--background);
   --color-foreground: var(--foreground);
   --color-card: var(--card);