Menu and other icons missing (as root & user) - Debian 13 with Gnome DE

### Describe the problem, feature or ask a question:

Hi All,

Firstly apologies if I do something wrong with this report, I've never used github or reported a bug before!

I've tried installing backintime on two different Debian 13 machines using the Gnome DE and have the same issue. Most of the icons are missing, both the menu icons and in the snapshot view (folder icons) This occurs when running Back in Time (root) and Back in Time as standard user. Screenshot below:

<img width="1911" height="269" alt="Image" src="https://github.com/user-attachments/assets/8e366b2e-a7bb-4d02-9b37-7048f98c4251" />


Back in time was installed from the Debian repository. I've tried both from Gnome software store, as well as command line... installing both backintime-common and backintime-qt. All have same result. I recently migrated from Linux Mint Cinnamon and backintime worked fine there, so seems to be unique to the Debian/Gnome setup?

I found this issue which appears very similar to mine: https://github.com/bit-team/backintime/issues/1836 I did note however that issue appears to only affect when running as root user. My issue occurs both as root and standard user.

**Debug output:**

```
$ backintime-qt_polkit --debug
DEBUG: [common/backintime.py:668 argParse] Argument(s) used: {'debug': True, 'quiet': False}
DEBUG: [common/backintime.py:565 startApp] backintime: {'name': 'Back In Time', 'version': '1.5.5', 'running-as-root': True}; host-setup: {'OS': {'/etc/os-release': 'Debian GNU/Linux 13 (trixie)', '/etc/debian_version': '13.1\n'}}

Back In Time
Version: 1.5.5

Back In Time comes with ABSOLUTELY NO WARRANTY.
This is free software, and you are welcome to redistribute it
under certain conditions; type `backintime --license' for details.

DEBUG: [common/configfile.py:585 Config.setCurrentProfile] Change current profile: 1=Main profile
DEBUG: [common/tools.py:225 initiate_translation] Language code "en".
DEBUG: [common/tools.py:242 initiate_translation] Language code used: "en"
DEBUG: [common/backintime.py:754 getConfig] config file: "/root/.config/backintime/config"; share path: "/root/.local/share/backintime"; profiles: "1=Main profile"
DEBUG: [common/pluginmanager.py:233 PluginManager.load] Register plugin path /usr/share/backintime/plugins
DEBUG: [common/pluginmanager.py:254 PluginManager.load] Add plugin notifyplugin.py
DEBUG: [common/tools.py:1116 is_Qt_working] Qt probing result: exit code 2
DEBUG: [common/tools.py:1120 is_Qt_working] Qt probing stdout:

DEBUG: [common/tools.py:1121 is_Qt_working] Qt probing errout:
DEBUG: [common/qt_probing.py:96 <module>] /usr/share/backintime/common/qt_probing.py started... Call args: ['/usr/share/backintime/common/qt_probing.py', '--debug']
DEBUG: [common/qt_probing.py:97 <module>] Display system: ($XDG_SESSION_TYPE is not set)
DEBUG: [common/qt_probing.py:98 <module>] XDG_RUNTIME_DIR=($XDG_RUNTIME_DIR is not set)
DEBUG: [common/qt_probing.py:99 <module>] XAUTHORITY=/run/user/1000/.mutter-Xwaylandauth.9IV3E3
DEBUG: [common/qt_probing.py:100 <module>] QT_QPA_PLATFORM=($QT_QPA_PLATFORM is not set)
DEBUG: [common/qt_probing.py:102 <module>] Current euid: 0
DEBUG: [common/qt_probing.py:134 <module>] isSystemTrayAvailable for Qt: True
DEBUG: [common/qt_probing.py:139 <module>] /usr/share/backintime/common/qt_probing.py is terminating normally (exit code: 2)

DEBUG: [plugins/systrayiconplugin.py:62 init] System tray is available to show the BiT system tray icon
DEBUG: [common/pluginmanager.py:254 PluginManager.load] Add plugin systrayiconplugin.py
DEBUG: [qt/qttools.py:355 createQApplication] QT QPA platform plugin: xcb
DEBUG: [qt/qttools.py:356 createQApplication] QT_QPA_PLATFORMTHEME=<not set>
DEBUG: [qt/qttools.py:361 createQApplication] QT_STYLE_OVERRIDE=<not set>
DEBUG: [qt/qttools.py:364 createQApplication] QT active style: fusion
DEBUG: [qt/qttools.py:365 createQApplication] QT fallback style: hicolor
DEBUG: [qt/qttools.py:366 createQApplication] QT supported styles: ['qt5ct-style', 'qt6ct-style', 'Windows', 'Fusion']
DEBUG: [qt/qttools.py:367 createQApplication] themeSearchPaths: ['/usr/share/icons', ':/icons']
DEBUG: [qt/qttools.py:368 createQApplication] fallbackSearchPaths: ['/usr/share/pixmaps']
DEBUG: [qt/qttools.py:373 createQApplication] Is SystemTray available: True
DEBUG: [qt/qttools.py:391 createQApplication] Trying to set App ID for root user
DEBUG: [qt/qttools.py:434 initiate_translator] Language code "en".
DEBUG: [qt/statedata.py:145 file_path] State file path: /root/.local/state/backintime-qt.json
DEBUG: [qt/icon.py:11 <module>] Checking if the current theme contains the BiT icon...
DEBUG: [qt/icon.py:27 <module>] Probing theme: ubuntu-mono-dark (activated as ubuntu-mono-dark)
DEBUG: [qt/icon.py:27 <module>] Probing theme: gnome (activated as gnome)
DEBUG: [qt/icon.py:27 <module>] Probing theme: breeze (activated as breeze)
DEBUG: [qt/icon.py:27 <module>] Probing theme: breeze dark (activated as breeze dark)
DEBUG: [qt/icon.py:27 <module>] Probing theme: hicolor (activated as hicolor)
DEBUG: [qt/icon.py:27 <module>] Probing theme: adwaita (activated as adwaita)
DEBUG: [qt/icon.py:27 <module>] Probing theme: adwaita-dark (activated as adwaita-dark)
DEBUG: [qt/icon.py:27 <module>] Probing theme: yaru (activated as yaru)
DEBUG: [qt/icon.py:27 <module>] Probing theme: oxygen (activated as oxygen)
ERROR: [qt/icon.py:30 <module>] No supported theme installed (missing icons). Please consult the project web site for instructions how to fix this.
DEBUG: [common/tools.py:1512 keyringSupported] No keyring due to import error.
DEBUG: [common/mount.py:151 Mount.__init__] pw-cache is not running
DEBUG: [common/mount.py:162 Mount.__init__] Call command: ['/usr/bin/backintime', 'pw-cache', 'start']
DEBUG: [common/config.py:1514 Config._cron_line] Profile: Main profile | Automatic backup: 1
```


**Diagnostics:**

```
backintime-qt_polkit --diagnostics
{
    "backintime": {
        "name": "Back In Time",
        "version": "1.5.5",
        "running-as-root": true,
        "latest-config-version": 6,
        "local-config-file": "/root/.config/backintime/config",
        "local-config-file-found": true,
        "global-config-file": "/etc/backintime/config",
        "global-config-file-found": false,
        "started-from": "/usr/share/backintime/common",
        "user-callback": "/root/.config/backintime/user-callback",
        "keyring-supported": false
    },
    "host-setup": {
        "OS": {
            "/etc/os-release": "Debian GNU/Linux 13 (trixie)",
            "/etc/debian_version": "13.1\n"
        },
        "platform": "Linux-6.12.48+deb13-amd64-x86_64-with-glibc2.41",
        "system": "Linux #1 SMP PREEMPT_DYNAMIC Debian 6.12.48-1 (2025-09-20)",
        "display-system": "($XDG_SESSION_TYPE not set)",
        "locale": "en_AU, UTF-8",
        "PATH": "/usr/sbin:/usr/bin:/sbin:/bin:/root/bin",
        "RSYNC_OLD_ARGS": "(not set)",
        "RSYNC_PROTECT_ARGS": "(not set)"
    },
    "python-setup": {
        "python": "3.13.5 main Jun 25 2025 18:55:22 CPython GCC 14.2.0",
        "python-executable": "/usr/bin/python3",
        "python-executable-symlink": true,
        "python-executable-resolved": "/usr/bin/python3.13",
        "sys.path": [
            "/usr/share/backintime/qt/plugins",
            "/usr/share/backintime/common/plugins",
            "/usr/share/backintime/plugins",
            "/usr/share/backintime/common",
            "/usr/share/backintime/qt",
            "/usr/lib/python313.zip",
            "/usr/lib/python3.13",
            "/usr/lib/python3.13/lib-dynload",
            "/usr/local/lib/python3.13/dist-packages",
            "/usr/lib/python3/dist-packages"
        ],
        "qt": {
            "Version": "PyQt 6.9.0 / Qt 6.8.2",
            "Theme": "hicolor",
            "Theme Search Paths": [
                "/usr/share/icons",
                ":/icons"
            ],
            "Fallback Theme": "hicolor",
            "Fallback Search Paths": [
                "/usr/share/pixmaps"
            ]
        }
    },
    "external-programs": {
        "rsync": {
            "version": "3.4.1",
            "protocol": "32.0",
            "capabilities": "file_bits: 64; inum_bits: 64; timestamp_bits: 64; long_int_bits: 64; socketpairs: True; symlinks: True; symtimes: True; hardlinks: True; hardlink_specials: True; hardlink_symlinks: True; IPv6: True; atimes: True; batchfiles: True; inplace: True; append: True; ACLs: True; xattrs: True; secluded_args: optional; iconv: True; prealloc: True; stop_at: True; crtimes: False",
            "optimizations": "SIMD_roll: True; asm_roll: False; openssl_crypto: True; asm_MD5: False",
            "checksum_list": "xxh128, xxh3, xxh64, md5, md4, sha1, none",
            "compress_list": "zstd, lz4, zlibx, zlib, none",
            "daemon_auth_list": "sha512, sha256, sha1, md5, md4"
        },
        "ssh": "OpenSSH_10.0p2 Debian-7, OpenSSL 3.5.1 1 Jul 2025",
        "sshfs": "3.7.3",
        "encfs": "1.9.5",
        "shell": "/bin/bash",
        "shell-version": "GNU bash, version 5.2.37(1)-release (x86_64-pc-linux-gnu)"
    }
}
```

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Menu and other icons missing (as root & user) - Debian 13 with Gnome DE #2289

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Menu and other icons missing (as root & user) - Debian 13 with Gnome DE #2289

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