feat: window settings (optional outline, geometry fix, tray switch placement)

[zebus3d]

What and why

Three small window-related changes, one commit each, so any of them can be taken on its own:

1. Setting to hide the window outline. The frameless window draws a hairline edge (a border plus an inset ring) so it stands apart from whatever is behind it. On desktops that already separate windows well, such as KDE Plasma with a dark wallpaper, that line reads as a stray white border around the app. Window outline in Settings > Window turns it off. It defaults to on, so nothing changes for anyone who does not touch it, and it is hidden under OS native decorations, which already drop the outline.
2. Fix: restore the main window at the size it was saved. The geometry was saved with outerSize() but restored with setSize(), which sets the inner size. With a frameless window the two are the same, but with OS native decorations the window grew by the height of the frame on every launch. It now saves innerSize().
3. Move "Minimize to tray" to the Window tab. The switch lived on the Library tab ("Cache and local files"), where nobody looking for what the close button does would find it. It now sits right below the window controls, since it decides what the close button does. The settings search entry moves with it.

How it was checked

• npm run verify passes
• Ran the app and used the affected screen: EndeavourOS, KDE Plasma 6.7.5. Toggled the outline, relaunched with OS native decorations and window geometry persistence on, and checked the moved switch and its search entry.
• Screenshot or clip below (UI changes)

Notes for the reviewer

Frontend only, no Rust changes.

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