refactor: Extract interaction handling logic into dedicated ComponentInteractionHandler, AutocompleteHandler, and CommandHandler classes.

src/lib/handlers/AutocompleteHandler.ts

@@ -0,0 +1,21 @@
+import { AutocompleteInteraction } from "discord.js";
+import { AuroraClient } from "@/lib/BotClient";
+
+/**
+ * Handles autocomplete interactions for slash commands
+ */
+export class AutocompleteHandler {
+    static async handle(interaction: AutocompleteInteraction): Promise<void> {
+        const command = AuroraClient.commands.get(interaction.commandName);
+
+        if (!command || !command.autocomplete) {
+            return;
+        }
+
+        try {
+            await command.autocomplete(interaction);
+        } catch (error) {
+            console.error(`Error handling autocomplete for ${interaction.commandName}:`, error);
+        }
+    }
+}

src/lib/handlers/CommandHandler.ts

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+import { ChatInputCommandInteraction, MessageFlags } from "discord.js";
+import { AuroraClient } from "@/lib/BotClient";
+import { userService } from "@/modules/user/user.service";
+import { createErrorEmbed } from "@lib/embeds";
+
+/**
+ * Handles slash command execution
+ * Includes user validation and comprehensive error handling
+ */
+export class CommandHandler {
+    static async handle(interaction: ChatInputCommandInteraction): Promise<void> {
+        const command = AuroraClient.commands.get(interaction.commandName);
+
+        if (!command) {
+            console.error(`No command matching ${interaction.commandName} was found.`);
+            return;
+        }
+
+        // Ensure user exists in database
+        try {
+            await userService.getOrCreateUser(interaction.user.id, interaction.user.username);
+        } catch (error) {
+            console.error("Failed to ensure user exists:", error);
+        }
+
+        try {
+            await command.execute(interaction);
+        } catch (error) {
+            console.error(error);
+            const errorEmbed = createErrorEmbed('There was an error while executing this command!');
+
+            if (interaction.replied || interaction.deferred) {
+                await interaction.followUp({ embeds: [errorEmbed], flags: MessageFlags.Ephemeral });
+            } else {
+                await interaction.reply({ embeds: [errorEmbed], flags: MessageFlags.Ephemeral });
+            }
+        }
+    }
+}

src/lib/handlers/ComponentInteractionHandler.ts

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+import { ButtonInteraction, StringSelectMenuInteraction, ModalSubmitInteraction } from "discord.js";
+
+type ComponentInteraction = ButtonInteraction | StringSelectMenuInteraction | ModalSubmitInteraction;
+
+/**
+ * Handles component interactions (buttons, select menus, modals)
+ * Routes to appropriate handlers based on customId patterns
+ */
+export class ComponentInteractionHandler {
+    static async handle(interaction: ComponentInteraction): Promise<void> {
+        const { interactionRoutes } = await import("@lib/interaction.routes");
+
+        for (const route of interactionRoutes) {
+            if (route.predicate(interaction)) {
+                const module = await route.handler();
+                const handlerMethod = module[route.method];
+
+                if (typeof handlerMethod === 'function') {
+                    await handlerMethod(interaction);
+                    return;
+                } else {
+                    console.error(`Handler method ${route.method} not found in module`);
+                }
+            }
+        }
+    }
+}

src/lib/handlers/index.ts

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+export { ComponentInteractionHandler } from "./ComponentInteractionHandler";
+export { AutocompleteHandler } from "./AutocompleteHandler";
+export { CommandHandler } from "./CommandHandler";