feat: add optional role icon support and validation for booster roles

src/discord/commands/booster-role.ts

@@ -9,6 +9,7 @@ export const boosterRoleCommand = new SlashCommandBuilder()
       .setDescription("Claim a new custom cosmetic booster role")
       .addStringOption((option) => option.setName("name").setDescription("Role name").setRequired(true))
       .addStringOption((option) => option.setName("color").setDescription("Hex color like #AABBCC"))
+      .addAttachmentOption((option) => option.setName("icon").setDescription("Optional role icon image"))
   )
   .addSubcommand((command) =>
     command
@@ -22,4 +23,10 @@ export const boosterRoleCommand = new SlashCommandBuilder()
       .setDescription("Recolor your bot-managed booster role")
       .addStringOption((option) => option.setName("color").setDescription("Hex color like #AABBCC").setRequired(true))
   )
+  .addSubcommand((command) =>
+    command
+      .setName("icon")
+      .setDescription("Set an optional icon on your bot-managed booster role")
+      .addAttachmentOption((option) => option.setName("image").setDescription("Role icon image").setRequired(true))
+  )
   .addSubcommand((command) => command.setName("delete").setDescription("Delete your bot-managed booster role"));