Document Linux zenity requirement for AppImage installs

[miachillgood]

Summary

• Add a Linux installation note that minimal desktop environments may need zenity for the folder picker when using AppImage or .tar.gz packages.
• Mention that Flatpak typically includes the required portal integration.

Fixes #3973.

Validation

• git diff --check

Summary by Sourcery

Documentation:

• Add a note explaining that minimal Linux desktop environments may need zenity installed for the folder picker to work with AppImage or .tar.gz packages and that Flatpak usually includes the necessary portal integration.

[sourcery-ai]

Reviewer's guide (collapsed on small PRs)

Reviewer's Guide

Documents a Linux-specific requirement that minimal desktop environments may need zenity installed for AppImage or .tar.gz usage, clarifying behavior relative to Flatpak, by updating the README installation instructions.

Flow diagram for Linux installation options and zenity requirement

flowchart TD
    A[Linux_user] --> B[Choose_installation_method]
    B --> C[AppImage_or_tar_gz]
    B --> D[Flatpak]

    C --> E{Minimal_desktop_environment?}
    E -->|Yes| F[Install_zenity]
    E -->|No| G[Run_AppFlowy]
    F --> G

    D --> H[Use_Flatpak_with_portal_integration]
    H --> G

Loading

File-Level Changes

Change	Details	Files
Update Linux user installation documentation with zenity requirement and Flatpak note.	Add a sub-bullet under the desktop download link explaining that minimal Linux desktop environments should install zenity before using the AppImage or .tar.gz archive so the folder picker works correctly Clarify that Flatpak builds typically include the necessary portal integration, distinguishing them from AppImage/.tar.gz distributions	README.md

Assessment against linked issues

Issue	Objective	Addressed	Explanation
#3973	Update Linux installation documentation to state that minimal desktop environments must have zenity installed for the folder picker to work when using the AppImage or .tar.gz packages, and clarify that Flatpak generally includes the necessary integration.	✅

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