feat: support normalizing coordinate spaces

src/config.ts

@@ -1,7 +1,17 @@
+export type CoordinateSpace = "pixels" | "normalized_1000";
+
+export function readCoordinateSpace(value = "pixels"): CoordinateSpace {
+    if (value !== "pixels" && value !== "normalized_1000") {
+        throw new Error("DESKTOP_COORDINATE_SPACE must be pixels or normalized_1000.");
+    }
+    return value;
+}
+
 export interface Config {
     llamaCppOrigin: string;
     modelId: string;
     databasePath: string;
+    coordinateSpace: CoordinateSpace;
 }
 
 export function readConfig(environment: NodeJS.ProcessEnv = process.env): Config {
@@ -16,6 +26,7 @@ export function readConfig(environment: NodeJS.ProcessEnv = process.env): Config
         throw new Error("LLAMA_CPP_ORIGIN must be an HTTP(S) origin without credentials, path, query, or fragment.");
     }
     return {
+        coordinateSpace: readCoordinateSpace(environment.DESKTOP_COORDINATE_SPACE),
         llamaCppOrigin: url.origin,
         modelId,
         databasePath: environment.DATABASE_PATH?.trim() || "./data/token.sqlite",