Add a transparent window mode

[alan-rep]

Problem

OpenUsage currently only supports Light and Dark themes. While both work well, the window itself is fully opaque, which makes it feel heavier than native macOS utilities.

Since OpenUsage lives as a small utility panel, it would feel much more integrated with macOS if the window could behave like native floating panels with transparency and background blur.

Proposed Solution

Add a third appearance mode alongside Light and Dark, for example:

• System
• Light
• Dark
• Liquid Glass (or Transparent) that follows system settings

In this mode, the OpenUsage window would use macOS style transparency with a blurred background (similar to native macOS panels or system popovers)

Alternatives Considered

No response

Additional Context

No response

[robinebers]

just played with this, and honestly I like it

would love to hear some people's feedback

to me it makes it feel a little bit more native

[davidarny]

@robinebers looks beautiful! Is it just a blur or liquid glass thing? I was thinking of implementing liquid glass'ish kind of transparancy.

UPD: here how it looks:

UPD2: I used https://github.com/hkandala/tauri-plugin-liquid-glass plugin for that effect, but seems it introduces some compositing bugs

I couldn't figure out how to fix darken borders on curves yet

[robinebers]

damn this looks way better @davidarny

i'd almost say that the minor bugs are worth it

maybe commit this into a branch with a draft pr so we can play around with it a bit?

[davidarny]

damn this looks way better @davidarny

i'd almost say that the minor bugs are worth it

maybe commit this into a branch with a draft pr so we can play around with it a bit?

Sure, will do it

[alan-rep]

This looks great @davidarny maybe just a small tweak on the empty state color/transparency

[davidarny]

@robinebers @alan-rep here it is #303