Fix the broken always-on-top mode

[Tian L. (tian-lt)]

Root cause

The types for width and height saved in local settings is not matched universally for all the reads and writes. This leads to a type casting failure which blocks the logics to toggle the AOT mode.

Fix

Change the signature of function ToggleAlwaysOnTop from Task (float, float) to Task (double, double)

[Copilot]

Pull Request Overview

This PR fixes a type mismatch issue in the always-on-top (AOT) mode functionality that was preventing the feature from working correctly due to inconsistent type casting between float and double values.

• Changed the ToggleAlwaysOnTop method signature to accept double parameters instead of float
• Removed unnecessary type casting when calling the method
• Updated internal type casting to use double consistently

Reviewed Changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
src/Calculator/Views/MainPage.xaml.cs	Removed explicit float casting when calling ToggleAlwaysOnTop method
src/Calculator.ManagedViewModels/ApplicationViewModel.cs	Updated method signature and internal casting to use double consistently

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