fix(tray): hide passive status notifier items

[LuciusChen]

Summary

• omit StatusNotifierItems whose status is Passive from inline tray rendering
• keep tray drawer visibility and trigger counts consistent with the rendered items
• add focused coverage for Passive, Active, NeedsAttention, empty, and case-normalized statuses

Motivation

Clients such as udiskie implement smart tray behavior by changing their StatusNotifierItem from Active to Passive when no removable devices are available. Noctalia tracked that change but continued rendering the item, leaving a stale-looking removable-drive icon after unplugging the device.

Type of Change

• Bug fix
• New feature
• Breaking change
• Refactoring
• Build / packaging

Related Issue

Closes #3794

Testing

• meson test -C build-debug tray_identifier --print-errorlogs
• meson test -C build-debug tray_identifier fcitx_status icon_resolver --print-errorlogs
• git diff --check
• formatted changed C++ files with clang-format 22.1.8 (just is not installed in the test environment)

Manual Coverage

• Tested on Niri
• Tested on Hyprland
• Tested on Sway
• Tested on another compositor
• Tested with different bar positions and density settings
• Tested at different interface scaling values
• Tested with multiple monitors

The original behavior was reproduced on Labwc with udiskie 2.7.0. The patched build was covered by focused unit tests but was not installed over the running packaged Noctalia session.

Screenshots / Videos

Not included; this changes whether an idle tray item is present rather than its visual styling.

Checklist

• This PR is ready for review.
• I read and followed the relevant guidance in CONTRIBUTING.md.
• I ran just format with clang-format v22+ installed, or this PR has no code changes.
• I ran the relevant build and test commands.
• I self-reviewed the changes.
• I checked for new warnings or errors.
• This PR does not change user-facing configuration or require documentation updates.
• This PR adds no new user-facing strings.
• I did not edit non-English translation files.
• I used the existing canonical names for config keys, IPC names, paths, and identifiers.

Additional Notes

Unknown or empty status values remain visible for compatibility with incomplete third-party StatusNotifierItem implementations. Status matching is case-insensitive, consistent with the surrounding tray identifier normalization.