Add recycle bin support
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- Dominant language
- Java
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Description
### ⚠️ This issue respects the following points: ⚠️
- [x] This is a **enhancement/feature request**. Not a [bug or question](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 wanted feature/enhancement is not 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's settings are not touched. If your desired feature is present, you don't need to open this issue. The change will be part of the next Markor update.)
### Description
Currently, the files deleted in Markor cannot be retrieved/restored, so that would be great if the recycle bin feature can be added.
For this feature, Markor will automatically check and clear old (e.g. 30 days) files in the recycle bin.
@gsantner I know you and @harshad1 are very busy, so I hope I can implement this feature in the future.

### Information
Android version: Android 12
App Version: v2.16.1 (163)
### Source
F-Droid
### Format / File type
Not specific
### Additional info / Log
```shell
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```
Contributor guide
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First steps
- Read the whole issue, then the project's contributing guide.
- Comment on the issue to say you are picking it up — it saves two people doing the same work.
- Fork the repository and make your change on a branch.
- Open a pull request that references the issue number.
Research direction
The issue does not name implementation files, tests, or entry points. Start by tracing Markor's file-deletion flow and reviewing how files are managed on Android, then define the restore, retention, and automatic-cleanup behavior. Done means deleted files can be restored and older recycle-bin contents are cleared according to the agreed policy.
Written by the indexing model from the issue text.
Assessment
- Tech stack
- android, java
- Domain
- mobile
- Issue type
- Feature
- Difficulty
- 5/5
- Estimated time
- Over a week
- Activity status
- Quiet
- Clarity
- Mostly clear
- Newbie friendliness
- 45/100