* Refactor user settings to use enum for unit preferences (temperature,
network, disk).
* Update chart components to utilize new unit formatting functions
* Remove deprecated conversion functions and streamline unit handling
across charts.
* Enhance settings page to allow user selection of unit preferences with
updated labels.
- Introduce `Os` enum to represent supported operating systems.
- Update `SystemInfo` interface to include OS type.
- Refactor `ContainerChart` component to use `ChartType` enum for better clarity.
- Switched to dynamic units in container memory chart.
* Previously, a stopped container was completely removed from the chart/tooltip during the time period when it was not running. In the last few releases, the container remained in the chart with zero values if it was running at any time during the chart's duration. This restores the previous functionality.
