fix: limit unique filenames to be less 101

Anki will not handle filenames that are longer. Not sure what the exact
length is but if we are below 119 it should be safer than the current
132.

src/lib/misc/getUniqueFileName.test.ts

@@ -0,0 +1,7 @@
+import getUniqueFileName from './getUniqueFileName';
+
+describe('getUniqueFileName', () => {
+  test('default max is less than 101 characters', () => {
+    expect(getUniqueFileName('my image.jpg').length).toBeLessThan(101);
+  });
+});

src/lib/misc/getUniqueFileName.ts

@@ -6,10 +6,10 @@ import crypto from 'crypto';
  * @param input user supplied filename
  * @returns hex digest
  */
-const getUniqueFileName = (input: string) => {
+const getUniqueFileName = (input: string, max: number = 100) => {
   const shasum = crypto.createHash('sha512');
   shasum.update(input);
-  return shasum.digest('hex');
+  return shasum.digest('hex').slice(0, max);
 };
 
 export default getUniqueFileName;