Address review comments 1-4: Fix optional checks, remove redundant code, simplify column visibility, and share utility functions

Co-authored-by: ajnart <49837342+ajnart@users.noreply.github.com>

packages/docker/src/shared.ts

@@ -11,3 +11,22 @@ export const containerStateColorMap = {
   removing: "pink",
   dead: "dark",
 } satisfies Record<ContainerState, MantineColor>;
+
+export const memoryUsageColor = (number: number, state: string): MantineColor => {
+  const mbUsage = number / 1024 / 1024;
+  if (mbUsage === 0 && state !== "running") return "red";
+  if (mbUsage < 128) return "green";
+  if (mbUsage < 256) return "yellow";
+  if (mbUsage < 512) return "orange";
+  return "red";
+};
+
+export const cpuUsageColor = (number: number, state: string): MantineColor => {
+  if (number === 0 && state !== "running") return "red";
+  if (number < 40) return "green";
+  if (number < 60) return "yellow";
+  if (number < 90) return "orange";
+  return "red";
+};
+
+export const safeValue = (value?: number, fallback = 0) => (value !== undefined && !isNaN(value) ? value : fallback);