chore: import upstream snapshot with attribution

apps/webapp/app/utils/modelFormatters.ts

@@ -0,0 +1,56 @@
+import { formatNumberCompact } from "./numberFormatter";
+
+/** Format a per-token price as $/1M tokens. */
+export function formatModelPrice(pricePerToken: number | null): string {
+  if (pricePerToken === null) return "—";
+  const perMillion = pricePerToken * 1_000_000;
+  if (perMillion < 0.01) return `$${perMillion.toFixed(4)}`;
+  if (perMillion < 1) return `$${perMillion.toFixed(3)}`;
+  return `$${perMillion.toFixed(2)}`;
+}
+
+/** Format a token count (context window, max output). */
+export function formatTokenCount(tokens: number | null): string {
+  if (tokens === null) return "—";
+  return formatNumberCompact(tokens);
+}
+
+/** Format a dollar cost value. */
+export function formatModelCost(dollars: number): string {
+  if (dollars === 0) return "$0";
+  if (dollars < 0.01) return `$${dollars.toFixed(4)}`;
+  if (dollars < 1) return `$${dollars.toFixed(3)}`;
+  return `$${dollars.toFixed(2)}`;
+}
+
+/** Format a feature slug (snake_case) to Title Case. */
+export function formatFeature(slug: string): string {
+  return slug
+    .toLowerCase()
+    .split("_")
+    .map((word) => word.charAt(0).toUpperCase() + word.slice(1))
+    .join(" ");
+}
+
+/** @deprecated Use formatFeature instead. */
+export const formatCapability = formatFeature;
+
+/** Capitalize a provider name. */
+export function formatProviderName(provider: string): string {
+  const names: Record<string, string> = {
+    openai: "OpenAI",
+    anthropic: "Anthropic",
+    google: "Google",
+    meta: "Meta",
+    mistral: "Mistral",
+    cohere: "Cohere",
+    ai21: "AI21",
+    amazon: "Amazon",
+    xai: "xAI",
+    deepseek: "DeepSeek",
+    qwen: "Qwen",
+    perplexity: "Perplexity",
+    nous: "Nous",
+  };
+  return names[provider.toLowerCase()] ?? provider.charAt(0).toUpperCase() + provider.slice(1);
+}