feat: add social features, leaderboard, auth enhancements, and admin fixes

- Implement Social Features: Shared Tasks, Global Access, Privacy Settings (Leaderboard/Searchable).
- Add Leaderboard Page and API.
- Enhance Auth: Support Email/Username login, explicit duplicate registration errors.
- Fix: Admin login password hash regression.
- Refactor: Move to wouter for routing, add Admin Dashboard and User Management.
- Add Setup Wizard.
- Update UI with Sidebar and Gamification elements.

client/src/lib/nlp.ts

@@ -0,0 +1,53 @@
+export interface ParsedTask {
+    title: string;
+    priority?: 'low' | 'medium' | 'high';
+    dueDate?: Date;
+    labelName?: string;
+}
+
+export const parseTaskInput = (input: string): ParsedTask => {
+    let title = input;
+    let priority: ParsedTask['priority'] | undefined;
+    let dueDate: Date | undefined;
+    let labelName: string | undefined;
+
+    // Parse Priority (!high, !medium, !low)
+    const priorityMatch = title.match(/!(high|medium|low)/i);
+    if (priorityMatch) {
+        priority = priorityMatch[1].toLowerCase() as ParsedTask['priority'];
+        title = title.replace(priorityMatch[0], '').trim();
+    }
+
+    // Parse Label (#work, #personal)
+    const labelMatch = title.match(/#(\w+)/);
+    if (labelMatch) {
+        labelName = labelMatch[1];
+        title = title.replace(labelMatch[0], '').trim();
+    }
+
+    // Parse Date (tomorrow, today, next friday) - Simple heuristic
+    // Note: For production capability, use 'chrono-node'
+    const today = new Date();
+    const tomorrow = new Date(today);
+    tomorrow.setDate(tomorrow.getDate() + 1);
+
+    if (title.match(/\btomorrow\b/i)) {
+        dueDate = tomorrow;
+        title = title.replace(/\btomorrow\b/i, '').trim();
+    } else if (title.match(/\btoday\b/i)) {
+        dueDate = today;
+        title = title.replace(/\btoday\b/i, '').trim();
+    } else if (title.match(/\bnext week\b/i)) {
+        const nextWeek = new Date(today);
+        nextWeek.setDate(today.getDate() + 7);
+        dueDate = nextWeek;
+        title = title.replace(/\bnext week\b/i, '').trim();
+    }
+
+    return {
+        title,
+        priority,
+        dueDate,
+        labelName
+    };
+};