Refactor unit preferences and update chart components

* 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.

beszel/site/src/lib/enums.ts

@@ -1,3 +1,4 @@
+/** Operating system */
 export enum Os {
 	Linux = 0,
 	Darwin,
@@ -5,9 +6,18 @@ export enum Os {
 	FreeBSD,
 }
 
+/** Type of chart */
 export enum ChartType {
 	Memory,
 	Disk,
 	Network,
 	CPU,
 }
+
+/** Unit of measurement */
+export enum Unit {
+	Bytes,
+	Bits,
+	Celsius,
+	Fahrenheit,
+}