style: configure deno fmt to use single quotes

- Add singleQuote: true to deno.json fmt configuration
- Reformat all files with single quotes using deno fmt

ts/helpers/shortid.ts

@@ -5,11 +5,11 @@
 export function shortId(): string {
   // Define the character set: a-z, A-Z, 0-9
   const chars = 'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789';
-  
+
   // Generate cryptographically secure random values
   const randomValues = new Uint8Array(6);
   crypto.getRandomValues(randomValues);
-  
+
   // Map each random value to a character in our set
   let result = '';
   for (let i = 0; i < 6; i++) {
@@ -17,6 +17,6 @@ export function shortId(): string {
     const index = randomValues[i] % chars.length;
     result += chars[index];
   }
-  
+
   return result;
-}
+}