feat: Implement remark decoding for cloud types and oktas

Co-authored-by: aider (gemini/gemini-2.5-pro) <aider@aider.chat>

metar.html

@@ -120,12 +120,41 @@
             const hpa = (pressure < 500 ? 1000 : 900) + (pressure / 10);
             return `SLP${pressure}: Sea-level pressure ${hpa.toFixed(1)} hPa`;
         }
+        
+        function decodeCloudTypesRemark(code) {
+            const cloudTypes = {
+                'CI': 'Cirrus',
+                'CC': 'Cirrocumulus',
+                'CS': 'Cirrostratus',
+                'AC': 'Altocumulus',
+                'AS': 'Altostratus',
+                'NS': 'Nimbostratus',
+                'SC': 'Stratocumulus',
+                'ST': 'Stratus',
+                'CU': 'Cumulus',
+                'CB': 'Cumulonimbus'
+            };
+            
+            let decodedParts = [];
+            const matches = code.matchAll(/([A-Z]{2})(\d)/g);
+
+            for (const match of matches) {
+                const cloudCode = match[1];
+                const oktas = match[2];
+                const cloudName = cloudTypes[cloudCode] || `Unknown cloud type (${cloudCode})`;
+                decodedParts.push(`${oktas}/8 ${cloudName}`);
+            }
+
+            return `${code}: ${decodedParts.join(', ')}`;
+        }
 
         function decodeRemarks(parts) {
             let decoded = ["RMK: Remarks"];
             parts.forEach(part => {
                 if (part.startsWith('SLP')) {
                     decoded.push(`  - ${decodeSlp(part)}`);
+                } else if (part.match(/^([A-Z]{2}\d)+$/)) {
+                    decoded.push(`  - ${decodeCloudTypesRemark(part)}`);
                 } else if (part.match(/^(AC|CI|CC)/)) {
                      decoded.push(`  - ${part}: Cloud types and coverage details`);
                 } else {