feat: Add decoding for density altitude and lenticular cloud remarks

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

metar.html

@@ -285,6 +285,22 @@
                     const direction = directions[parts[i+2]];
                     decoded.push(`  - TCU DSNT ${parts[i+2]}: Towering cumulus distant ${direction.toLowerCase()}`);
                     i += 2; // Consume DSNT and direction
+                } else if (part === 'DENSITY' && i + 2 < parts.length && parts[i+1] === 'ALT' && parts[i+2].endsWith('FT')) {
+                    const altFeet = parts[i+2];
+                    const altitude = parseInt(altFeet.replace('FT', '')).toLocaleString();
+                    decoded.push(`  - DENSITY ALT ${altFeet}: Density altitude ${altitude} feet`);
+                    i += 2; // consume ALT and altFeet
+                } else if (cloudTypes[part] && i + 1 < parts.length && parts[i+1] === 'LENT') {
+                    const cloudName = cloudTypes[part];
+                    let remark = `  - ${part} LENT: ${cloudName} lenticularis`;
+                    let consumed = 1;
+                    if (i + 2 < parts.length && directions[parts[i+2]]) {
+                        const direction = directions[parts[i+2]];
+                        remark = `  - ${part} LENT ${parts[i+2]}: ${cloudName} lenticularis to the ${direction.toLowerCase()}`;
+                        consumed = 2;
+                    }
+                    decoded.push(remark);
+                    i += consumed;
                 } else if (specialRemarks[part]) {
                     decoded.push(`  - ${part}: ${specialRemarks[part]}`);
                 } else if (cloudTypes[part] && i + 1 < parts.length && parts[i + 1] === 'TR') {