Add temperature chart filtering (#430)

- Refactored ContainerFilterBar to accept a dynamic store prop.
- Updated filtering logic in ContainerChart to be case-insensitive.

beszel/site/src/lib/stores.ts

@@ -38,6 +38,9 @@ $userSettings.subscribe((value) => {
 /** Container chart filter */
 export const $containerFilter = atom("")
 
+/** Temperature chart filter */
+export const $temperatureFilter = atom("")
+
 /** Fallback copy to clipboard dialog content */
 export const $copyContent = atom("")