System Tray icon on Ubuntu is black-on-black during light system mode

[sdjmchattie]

Steps to Reproduce

1. Run Sidra on a recent Ubuntu installation (26.04 in my case) with dark style enabled.
2. Observe the icon in the system tray, top right of the screen.
3. Switch the system to light style.

Expected Behavior

The Sidra icon should remain visible (like the way other apps like Slack do) by staying white.
The System Tray on Ubuntu 26.04 is always a black background, whether it's in light style or dark style.

Actual Behavior

The icon changes to black and becomes invisible against the System Tray.
The icon can still just about be made out when you hover in the space where it should be rendered and the highlight capsule appears around it.

Error Output

Version

0.3.5

Environment

Ubuntu 0.3.5, installed from the App Center

Additional Context

No response

Checklist

• I have searched existing issues to avoid duplicates
• I have provided all the requested information above
• I can reproduce this issue consistently

[flexiondotorg]

While investigating this issue I discovered that the AppIndicator no longer appears in Ubuntu when installed via the snap. This is because Chromium 150 changed the tray path to /org/chromium/StatusNotifierItem/<id> which is not covered by the snapd AppArmor policies.

Here's the proposed upstream fix:

• interfaces: allow Chromium StatusNotifierItem object paths in unity7 canonical/snapd#17415

[flexiondotorg]

Looks like Electron might be reverting the bus name change:

• fix: restore org.kde SNI bus name prefix for snap confinement electron/electron#52819

[MariusQuabeck]

I can reproduce the contrast problem with Sidra 0.4.1 installed from the official amd64 Deb package, so this part is not Snap-specific.

Environment: Ubuntu 26.04 LTS, GNOME Shell 50.1, Wayland, default Ubuntu top bar.

• With org.gnome.desktop.interface color-scheme set to default (light system mode), Sidra selects sidra-tray-light.png, whose black glyph is almost invisible on GNOME's black top bar.
• With the color scheme set to prefer-dark, Sidra switches live to sidra-tray-dark.png; the white glyph is clearly visible.
• The AppIndicator itself appears and works in the Deb build. Only the light-mode icon contrast is affected.

This reproduced consistently, including after switching the system style back and forth. It looks as though choosing the tray asset from the global light/dark preference does not account for GNOME's always-dark top bar.