refactor: add quest view layer

Create quest.view.ts with UI logic extracted from quests command:
- getQuestListEmbed() for quest log display
- formatQuestRewards() helper for reward formatting
- getQuestStatus() helper for status display

Updated quests.ts to use view functions instead of inline embed building.

src/modules/quest/quest.view.ts

@@ -0,0 +1,54 @@
+import { EmbedBuilder } from "discord.js";
+
+/**
+ * Quest entry with quest details and progress
+ */
+interface QuestEntry {
+    progress: number | null;
+    completedAt: Date | null;
+    quest: {
+        name: string;
+        description: string | null;
+        rewards: any;
+    };
+}
+
+/**
+ * Formats quest rewards object into a human-readable string
+ */
+function formatQuestRewards(rewards: { xp?: number, balance?: number }): string {
+    const rewardStr: string[] = [];
+    if (rewards?.xp) rewardStr.push(`${rewards.xp} XP`);
+    if (rewards?.balance) rewardStr.push(`${rewards.balance} 🪙`);
+    return rewardStr.join(", ");
+}
+
+/**
+ * Returns the quest status display string
+ */
+function getQuestStatus(completedAt: Date | null): string {
+    return completedAt ? "✅ Completed" : "📝 In Progress";
+}
+
+/**
+ * Creates an embed displaying a user's quest log
+ */
+export function getQuestListEmbed(userQuests: QuestEntry[]): EmbedBuilder {
+    const embed = new EmbedBuilder()
+        .setTitle("📜 Quest Log")
+        .setColor(0x3498db); // Blue
+
+    userQuests.forEach(entry => {
+        const status = getQuestStatus(entry.completedAt);
+        const rewards = entry.quest.rewards as { xp?: number, balance?: number };
+        const rewardsText = formatQuestRewards(rewards);
+
+        embed.addFields({
+            name: `${entry.quest.name} (${status})`,
+            value: `${entry.quest.description}\n**Rewards:** ${rewardsText}\n**Progress:** ${entry.progress}%`,
+            inline: false
+        });
+    });
+
+    return embed;
+}