[KennyMcSimpson]

Problem

On Windows, the app used Electron's default floating window level for the always-on-top setting. That level does not consistently map to the native topmost style, so the preference could appear enabled while the window still fell behind other applications.

Changes

• Use the Windows torn-off level when always-on-top is enabled, which maps to the native topmost style.
• Route all native always-on-top updates through one helper, including docked and restored states.
• Allow the Electron UI test to accept the one-device-pixel height rounding produced by Windows DPI scaling.

Verification

• Core tests: 29 passed
• Electron UI tests: 23 passed
• Renderer errors: none
• git diff --check: passed