fix: Tray icon not working on Flatpak for Linux

[Fei1Yang]

This pull request will:

• Use correct icon brightness
• When in Flatpak, use installed tray icon to workaround filesystem difference between the sandboxed envirnoment and host.

Summary by Sourcery

Use the correct tray icon brightness on Linux. When running in a Flatpak environment, use the installed tray icon to resolve filesystem discrepancies between the sandboxed environment and the host.

New Features:

• Add support for Flatpak environments by using the installed tray icon.

Enhancements:

• Improve the tray icon selection logic to use different icons based on the system brightness.

[sourcery-ai]

Reviewer's Guide by Sourcery

This pull request improves the tray icon on Linux by using the correct icon brightness and using the installed tray icon when in a Flatpak environment to workaround filesystem differences between the sandboxed environment and the host.

Sequence diagram for tray icon path resolution

sequenceDiagram
    participant App
    participant TrayManager
    participant Platform
    participant SchedulerBinding

    App->>TrayManager: getTrayIconPath()
    TrayManager->>Platform: isMacOS
    alt is MacOS
        Platform-->>TrayManager: true
        TrayManager-->>App: assets/mac-tray.svg
    else not MacOS
        Platform-->>TrayManager: false
        TrayManager->>SchedulerBinding: get platformBrightness
        SchedulerBinding-->>TrayManager: current brightness
        TrayManager->>Platform: isWindows
        alt is Windows
            Platform-->>TrayManager: true
            TrayManager-->>App: assets/tray_icon_{brightness}.ico
        else not Windows
            Platform-->>TrayManager: false
            TrayManager->>Platform: isLinux && FLATPAK_ID
            alt is Linux Flatpak
                Platform-->>TrayManager: true
                TrayManager-->>App: ci.not.Rune-tray-{brightness}
            else regular Linux
                Platform-->>TrayManager: false
                TrayManager-->>App: assets/linux-tray-{brightness}.svg
            end
        end
    end

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State diagram for tray icon path selection

stateDiagram-v2
    [*] --> CheckPlatform
    CheckPlatform --> MacOS: Platform.isMacOS
    CheckPlatform --> GetBrightness: !Platform.isMacOS

    MacOS --> [*]: Return mac-tray.svg

    GetBrightness --> Windows: Platform.isWindows
    GetBrightness --> Linux: !Platform.isWindows

    Windows --> [*]: Return tray_icon_{brightness}.ico

    Linux --> FlatpakCheck
    FlatpakCheck --> LinuxFlatpak: FLATPAK_ID exists
    FlatpakCheck --> RegularLinux: FLATPAK_ID not exists

    LinuxFlatpak --> [*]: Return ci.not.Rune-tray-{brightness}
    RegularLinux --> [*]: Return linux-tray-{brightness}.svg

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File-Level Changes

Change	Details	Files
Use correct icon brightness on Linux	Added logic to select a dark or light tray icon based on the system brightness. Added dark and light tray icons to assets. Updated pubspec.yaml to include the new assets.	lib/utils/tray_manager.dart pubspec.yaml assets/linux-tray-dark.svg assets/linux-tray-light.svg
Use installed tray icon when in Flatpak on Linux	Added logic to use the installed tray icon when the application is running in a Flatpak environment on Linux.	lib/utils/tray_manager.dart

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[sourcery-ai]

Hey @Fei1Yang - I've reviewed your changes and they look great!

Here's what I looked at during the review

• 🟢 General issues: all looks good
• 🟢 Security: all looks good
• 🟢 Testing: all looks good
• 🟢 Complexity: all looks good
• 🟢 Documentation: all looks good

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