fix(tasks): correct URL basename extraction for trailing slashes

URLs ending with '/' were incorrectly truncating the last character
of the path segment when extracting attachment titles.

Example fix:
- Input: https://example.com/path/
- Before: "pat" (lost one character)
- After: "path" (correct)

Changed substring offset from -2 to -1 to properly remove only
the trailing slash character.

src/app/features/tasks/short-syntax.ts

@@ -547,7 +547,7 @@ const _baseNameForUrl = (passedStr: string): string => {
   const str = passedStr.trim();
   let base;
   if (str[str.length - 1] === '/') {
-    const strippedStr = str.substring(0, str.length - 2);
+    const strippedStr = str.substring(0, str.length - 1);
     base = strippedStr.substring(strippedStr.lastIndexOf('/') + 1);
   } else {
     base = str.substring(str.lastIndexOf('/') + 1);