feat: add contact management functionality

- Implemented ContactForm component for creating and editing contacts.
- Added ProjectContactSelector component to manage project-specific contacts.
- Updated ProjectForm to include ProjectContactSelector for associating contacts with projects.
- Enhanced Card component with a new CardTitle subcomponent for better structure.
- Updated Navigation to include a link to the contacts page.
- Added translations for contact-related terms in the i18n module.
- Initialized contacts database schema and created necessary tables for contact management.
- Developed queries for CRUD operations on contacts, including linking and unlinking contacts to projects.
- Created a test script to validate contact queries against the database.

test-contacts-query.mjs

@@ -0,0 +1,54 @@
+import db from './src/lib/db.js';
+
+console.log('Testing contacts query...\n');
+
+try {
+	// Test 1: Basic query
+	console.log('Test 1: Basic contact query');
+	const basic = db.prepare('SELECT contact_id, name FROM contacts WHERE is_active = 1 LIMIT 3').all();
+	console.log('✓ Basic query works:', basic.length, 'contacts\n');
+	
+	// Test 2: With LEFT JOIN
+	console.log('Test 2: With project_contacts join');
+	const withJoin = db.prepare(`
+		SELECT c.contact_id, c.name, COUNT(pc.project_id) as count
+		FROM contacts c
+		LEFT JOIN project_contacts pc ON c.contact_id = pc.contact_id
+		WHERE c.is_active = 1
+		GROUP BY c.contact_id
+		LIMIT 3
+	`).all();
+	console.log('✓ Join query works:', withJoin.length, 'contacts\n');
+	
+	// Test 3: With both joins
+	console.log('Test 3: With both joins (no CASE)');
+	const bothJoins = db.prepare(`
+		SELECT c.contact_id, c.name, COUNT(p.project_id) as count
+		FROM contacts c
+		LEFT JOIN project_contacts pc ON c.contact_id = pc.contact_id
+		LEFT JOIN projects p ON pc.project_id = p.project_id
+		WHERE c.is_active = 1
+		GROUP BY c.contact_id
+		LIMIT 3
+	`).all();
+	console.log('✓ Both joins work:', bothJoins.length, 'contacts\n');
+	
+	// Test 4: With CASE statement
+	console.log('Test 4: With CASE statement');
+	const withCase = db.prepare(`
+		SELECT c.contact_id, c.name,
+			COUNT(DISTINCT CASE WHEN p.is_deleted = 0 THEN p.project_id ELSE NULL END) as count
+		FROM contacts c
+		LEFT JOIN project_contacts pc ON c.contact_id = pc.contact_id
+		LEFT JOIN projects p ON pc.project_id = p.project_id
+		WHERE c.is_active = 1
+		GROUP BY c.contact_id
+		LIMIT 3
+	`).all();
+	console.log('✓ CASE query works:', withCase.length, 'contacts');
+	withCase.forEach(c => console.log(`  ${c.name}: ${c.count} active projects`));
+	
+} catch (error) {
+	console.error('❌ Query failed:', error.message);
+	console.error(error.stack);
+}