[Bug]: Ignored files not reliably respected for folders

### Bug description

More often than not, folders that should be ignored based on the `sync-exclude.lst` (be it global or per sync / folder), are still uploaded. I observe this for example for `.git` folders, which should be matched by the line `].git/`. It's possibly related to filesystem change watch, because if the folder once is created and properly ignored, it stays ignored. Observed on Mac and Linux platforms.

### Steps to reproduce

1. Add ignore pattern ending with / (possibly this also effects rules not ending in / but not tested)
2. Have some process create a folder with name/path matching the rule or create manually.
3. Folder is uploaded to server.

### Expected behavior

Folder should not be uploaded.

### Which version of the operating system you are running.

Ubuntu 25.04

### Package

Official Linux AppImage

### Nextcloud Server version

31.0.7

### Nextcloud Desktop Client version

3.17.1

### Is this bug present after an update or on a fresh install?

Updated to a major version (ex. 3.3.6 to 3.4.0)

### Additional info

Omited client debug archive as it didn't seem to contain relevant data, but mostly sensitive data.