[[wikilinks]] not wrapping / detecting files before them in the file tree

### ⚠️ This issue respects the following points: ⚠️

- [x] This is a **bug**. Not a [question or feature request](https://github.com/gsantner/markor/issues/new/choose).
- [x] The topic is **not** already reported at [Issues](https://github.com/gsantner/markor/issues?q=#js-issues-search). _(I've searched it and checked most recent issues)_.
- [x] Markor **is** up to date. See [Releases](https://github.com/gsantner/markor/tags) for the latest version. Updates are available from [F-Droid](https://f-droid.org/en/packages/net.gsantner.markor/) and GitHub.
- [x] The bug is still present in the latest development version (git master). (Please [download](https://nightly.link/gsantner/markor/workflows/build-android-project/master) and try the test version of Markor, named **Marder**. Don't worry; Markor and Marder appear as completely separate applications. You can install both side-by-side, and Markor settings are not touched. In case the issue is resolved there, you don't need to create a bug report. The change will be part of the next Markor update.)

### Description

[[wikilinks]] do not wrap / do not detect documents before them in a file tree. This pretty much prevents the creation of more cross folder strung wiki structures. I not too performance heavy fix would be an optional setting to make [[wikilinks]] detect all files inside the notebook folder.

### Steps to reproduce

1. Have a main folder, with another "testfolder" and a document named f.e. "testfile" (write something into this one, so you recognize it from "inside".
2. Go into the testfolder. Make a new document inside — f.e. test2. Now inside test2 make a wikilink [[testfile]]
3. Clicking it will create a new document inside testfolder, instead of opening the testfile document.

### Information

Android version: 13
Device (phone model): moto g32
App Version: Markor: v2.16.1 (163)
Marder: v2.16.1-1606 (260525)

### Source

F-Droid

### Format / File type

Not specific

### Additional info / Log

```shell

```

Reproduce the issue in Markor by following the listed testfolder, testfile, test2, and [[testfile]] steps, then trace wikilink handling and file-tree lookup. Done means an existing document before the link opens instead of creating a duplicate in the current folder, with the broader lookup available as an optional setting.

Written by the indexing model from the issue text.