Add profile photo uploads and custom difficulty support

shared/protocol.ts

@@ -171,6 +171,35 @@ export const difficulties = {
   hard: { seconds: 30, zoom: false, label: "Hard" },
 } as const;
 export type Difficulty = keyof typeof difficulties;
+export type DifficultyPreset = {
+  id: string;
+  name: string;
+  seconds: number;
+  zoom: boolean;
+};
+export const customDifficultySchema = z
+  .object({
+    name: z
+      .string()
+      .trim()
+      .min(2)
+      .max(40)
+      .refine(
+        (name) =>
+          !/[\u0000-\u001f\u007f-\u009f\u202a-\u202e\u2066-\u2069]/u.test(
+            name,
+          ),
+        "Difficulty names cannot contain hidden controls",
+      ),
+    seconds: z
+      .number()
+      .int()
+      .min(15)
+      .max(600)
+      .refine((seconds) => seconds % 15 === 0),
+    zoom: z.boolean(),
+  })
+  .strict();
 export function scoreGuess(
   a: Pick<Point, "x" | "z">,
   b: Pick<Point, "x" | "z">,