Items 10-15: ES modules, inline style cleanup, template modal, code modernization

- Item 10: Convert to ES modules with import/export, single module entry point
- Item 11: Replace inline styles with CSS classes (background overlay, card
  animations, highlight effect, config modal form elements)
- Item 12: Move ConfigManager modal HTML from JS template literal to
  <template> element in index.html
- Item 13: Replace deprecated url.parse() with new URL() in server.js
  and update route handlers to use searchParams
- Item 14: Replace JSON.parse/stringify deep clone with structuredClone()
- Item 15: Remove dead JSON-fixing regex code from departures.js route

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

server/routes/departures.js

@@ -23,62 +23,14 @@ function fetchDeparturesForSite(siteId) {
       });
 
       res.on('end', () => {
-        console.log('Raw API response:', data.substring(0, 200) + '...');
-        
         try {
-          try {
-            const parsedData = JSON.parse(data);
-            console.log('Successfully parsed as regular JSON');
-            resolve(parsedData);
-            return;
-          } catch (jsonError) {
-            console.log('Not valid JSON, trying to fix format...');
-          }
-          
-          if (data.startsWith('departures":')) {
-            data = '{' + data;
-          } else if (data.includes('departures":')) {
-            const startIndex = data.indexOf('departures":');
-            if (startIndex > 0) {
-              data = '{' + data.substring(startIndex);
-            }
-          }
-          
-          data = data.replace(/}{\s*"/g, '},{"');
-          data = data.replace(/"([^"]+)":\s*([^,{}\[\]]+)(?=")/g, '"$1": $2,');
-          data = data.replace(/,\s*}/g, '}').replace(/,\s*\]/g, ']');
-          
-          try {
-            const parsedData = JSON.parse(data);
-            console.log('Successfully parsed fixed JSON');
-            
-            if (parsedData && parsedData.departures && parsedData.departures.length > 0) {
-              console.log('Sample departure structure:', JSON.stringify(parsedData.departures[0], null, 2));
-              
-              const sample = parsedData.departures[0];
-              console.log('Direction fields:', {
-                direction: sample.direction,
-                directionText: sample.directionText,
-                directionCode: sample.directionCode,
-                destination: sample.destination
-              });
-            }
-            
-            resolve(parsedData);
-          } catch (parseError) {
-            console.error('Failed to parse even after fixing:', parseError);
-            // Return empty departures array instead of rejecting to be more resilient
-            resolve({
-              departures: [],
-              error: 'Failed to parse API response: ' + parseError.message
-            });
-          }
+          const parsedData = JSON.parse(data);
+          resolve(parsedData);
         } catch (error) {
-          console.error('Error processing API response:', error);
-          // Return empty departures array instead of rejecting to be more resilient
+          console.error('Error parsing departures API response:', error);
           resolve({
             departures: [],
-            error: 'Error processing API response: ' + error.message
+            error: 'Failed to parse API response: ' + error.message
           });
         }
       });