added edit page and revised edit form

src/lib/timeline/TimelineCard.svelte

@@ -1,28 +1,9 @@
 <script>
+  import { flagEmoji } from '../shared/countries.js';
+
   /** @type {{ entry: import('../stores/journalStore.js').JournalEntry, onClick: () => void }} */
   let { entry, onClick } = $props();
 
-  /** Convert country name to flag emoji via ISO 3166-1 alpha-2 */
-  const countryCodeMap = {
-    'Japan': 'JP', 'France': 'FR', 'Spain': 'ES', 'USA': 'US',
-    'Thailand': 'TH', 'Germany': 'DE', 'Italy': 'IT', 'UK': 'GB',
-    'Australia': 'AU', 'Canada': 'CA', 'China': 'CN', 'India': 'IN',
-    'Brazil': 'BR', 'Mexico': 'MX', 'Portugal': 'PT', 'Netherlands': 'NL',
-    'Greece': 'GR', 'Turkey': 'TR', 'Vietnam': 'VN', 'Indonesia': 'ID',
-    'Malaysia': 'MY', 'Singapore': 'SG', 'South Korea': 'KR', 'Taiwan': 'TW',
-    'New Zealand': 'NZ', 'Argentina': 'AR', 'Chile': 'CL', 'Peru': 'PE',
-    'Morocco': 'MA', 'Egypt': 'EG', 'Kenya': 'KE', 'South Africa': 'ZA',
-    'Sweden': 'SE', 'Norway': 'NO', 'Denmark': 'DK', 'Finland': 'FI',
-    'Switzerland': 'CH', 'Austria': 'AT', 'Belgium': 'BE', 'Poland': 'PL',
-    'Czech Republic': 'CZ', 'Hungary': 'HU', 'Croatia': 'HR',
-  };
-
-  function flagEmoji(country) {
-    const code = countryCodeMap[country];
-    if (!code) return '';
-    return [...code].map(c => String.fromCodePoint(0x1F1E6 - 65 + c.charCodeAt(0))).join('');
-  }
-
   function formatDate(/** @type {string} */ iso) {
     return new Date(iso).toLocaleDateString('en-US', {
       month: 'short', day: 'numeric', year: 'numeric',