Function parseStoredName

parseStoredName(
storedName: string,
delimiter: string,
): { filename: string; id: string }
Parse a stored filename back into ID and original filename

Strategy: Find FIRST occurrence of delimiter to split. Everything before = ID, everything after = original filename.

This means the original filename CAN contain the delimiter without breaking parsing.
Parameters
- storedName: string
  Stored filename to parse
- delimiter: string
  Delimiter used between ID and filename
Returns { filename: string; id: string }
Object with id and filename properties
Example
```
parseStoredName('abc123-report.pdf', '-')
// => { id: 'abc123', filename: 'report.pdf' }
```
Example
```
// Handles delimiter in filename correctly
parseStoredName('abc123-report-2024-final.pdf', '-')
// => { id: 'abc123', filename: 'report-2024-final.pdf' }
```
Example
```
// Fallback if no delimiter found
parseStoredName('report.pdf', '-')
// => { id: 'report.pdf', filename: 'report.pdf' }
```
- Defined in src/file-serving/utils.ts:101