feat: support audio/video/doc media caps and transcript context

src/media/constants.ts

@@ -0,0 +1,31 @@
+export const MAX_IMAGE_BYTES = 6 * 1024 * 1024; // 6MB
+export const MAX_AUDIO_BYTES = 16 * 1024 * 1024; // 16MB
+export const MAX_VIDEO_BYTES = 16 * 1024 * 1024; // 16MB
+export const MAX_DOCUMENT_BYTES = 100 * 1024 * 1024; // 100MB
+
+export type MediaKind = "image" | "audio" | "video" | "document" | "unknown";
+
+export function mediaKindFromMime(mime?: string | null): MediaKind {
+	if (!mime) return "unknown";
+	if (mime.startsWith("image/")) return "image";
+	if (mime.startsWith("audio/")) return "audio";
+	if (mime.startsWith("video/")) return "video";
+	if (mime === "application/pdf") return "document";
+	if (mime.startsWith("application/")) return "document";
+	return "unknown";
+}
+
+export function maxBytesForKind(kind: MediaKind): number {
+	switch (kind) {
+		case "image":
+			return MAX_IMAGE_BYTES;
+		case "audio":
+			return MAX_AUDIO_BYTES;
+		case "video":
+			return MAX_VIDEO_BYTES;
+		case "document":
+			return MAX_DOCUMENT_BYTES;
+		default:
+			return MAX_DOCUMENT_BYTES;
+	}
+}