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.

src/lib/i18n.js

@@ -12,6 +12,7 @@ const translations = {
     navigation: {
       dashboard: "Panel główny",
       projects: "Projekty", 
+      contacts: "Kontakty",
       calendar: "Kalendarz",
       taskTemplates: "Szablony zadań",
       projectTasks: "Zadania projektów",
@@ -245,6 +246,38 @@ const translations = {
       }
     },
 
+    // Contacts
+    contacts: {
+      title: "Kontakty",
+      subtitle: "Zarządzaj kontaktami",
+      contact: "Kontakt",
+      newContact: "Nowy kontakt",
+      editContact: "Edytuj kontakt",
+      deleteContact: "Usuń kontakt",
+      name: "Imię i nazwisko",
+      phone: "Telefon",
+      email: "Email",
+      company: "Firma",
+      position: "Stanowisko",
+      contactType: "Typ kontaktu",
+      notes: "Notatki",
+      active: "Aktywny",
+      inactive: "Nieaktywny",
+      searchPlaceholder: "Szukaj kontaktów...",
+      noContacts: "Brak kontaktów",
+      addFirstContact: "Dodaj pierwszy kontakt",
+      selectContact: "Wybierz kontakt",
+      addContact: "Dodaj kontakt",
+      linkedProjects: "Powiązane projekty",
+      types: {
+        project: "Kontakt projektowy",
+        contractor: "Wykonawca",
+        office: "Urząd",
+        supplier: "Dostawca",
+        other: "Inny"
+      }
+    },
+
     // Contracts
     contracts: {
       title: "Umowy",