Add volume flyout sync toggle

[lgc2333]

Summary

Adds a volume setting above the volume flyout stay-duration control for linking manual media flyout triggers with the volume flyout.

Taskbar widget and tray "show media flyout" entries now go through a wrapper that:

• shows media first, then volume, when opening
• starts the volume hide animation before the media hide animation on toggle-close, without waiting between them

These popups are visually syncing when open btw

Media-key and volume-key paths keep their existing direct calls. Auto stay-duration behavior is still timer-driven, so matching media/volume durations naturally collapse together without extra close synchronization.

Motivation

closes #1050

Type of Change

• Feature

Checklist

• Code changes are manually tested and working.
• Formatting and naming are consistent with the project.
• Self-review of changes is done.
• AI tools were used (if yes, I reviewed and fully understand the changes myself).

[lgc2333]

maybe i should change the title of this configuration item? i think its meaning is too broad. because if the "always display" turned on, or the "stay time" setting is different between these widgets, they will not close at the same time.

only click the taskbar widget will let them close together now.

(sorry about my bad english skill)

[lgc2333]

close due to low possibility merging. issue: #1050