feat: list, pick and manage Ollama models from a command

src/lib/utils.ts

@@ -50,6 +50,33 @@ export function recencyGroup(timestamp: number, now: number = Date.now()): Recen
   return "Older";
 }
 
+/**
+ * A byte count for a person to read: "6.6 GB", "326 B".
+ *
+ * Decimal units, not the 1024-based ones a memory figure would use, because
+ * that is what every other tool in this ecosystem prints: `ollama list` shows
+ * 6550813657 bytes as 6.6 GB, and a number that disagreed with the terminal the
+ * user just looked at would read as a bug in this extension.
+ *
+ * `undefined` for a size that is absent or nonsense, so a caller can leave the
+ * field out rather than print "NaN B".
+ */
+export function formatBytes(bytes: number | undefined): string | undefined {
+  if (bytes === undefined || !Number.isFinite(bytes) || bytes < 0) return undefined;
+  if (bytes < 1000) return `${Math.round(bytes)} B`;
+
+  const units = ["kB", "MB", "GB", "TB"];
+  let value = bytes / 1000;
+  let unit = 0;
+
+  while (value >= 1000 && unit < units.length - 1) {
+    value /= 1000;
+    unit += 1;
+  }
+
+  return `${value.toFixed(1)} ${units[unit]}`;
+}
+
 /** Pulls a human-readable message out of anything that can be thrown. */
 export function errorMessage(error: unknown): string {
   if (error instanceof Error) return error.message;