refactor: Ensure METARs retain load order; use sorted list for random selection

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

metar.html

@@ -73,6 +73,7 @@
         const nextBtn = document.getElementById('next-btn');
         const decodeAllCheckbox = document.getElementById('decode-all-checkbox');
         const metars = [];
+        let sortedMetars = [];
 
         let currentMetarSections = [];
         let currentSectionIndex = 0;
@@ -828,9 +829,11 @@
             if (index !== undefined && index >= 0 && index < metars.length) {
                 metarIndex = index;
             } else {
-                // Bias random selection towards the more interesting (higher-scored) METARs at the start of the array.
+                // Bias random selection towards the more interesting (higher-scored) METARs.
                 // Math.random() * Math.random() skews distribution towards 0.
-                metarIndex = Math.floor(Math.random() * Math.random() * metars.length);
+                const randomSortedIndex = Math.floor(Math.random() * Math.random() * sortedMetars.length);
+                const selectedMetar = sortedMetars[randomSortedIndex];
+                metarIndex = metars.findIndex(m => m.metar === selectedMetar.metar);
             }
 
             if (metarIndex === currentMetarIndex) {
@@ -877,13 +880,14 @@
                     metars.push({ metar: metarString, score: score });
                 });
 
-                // 3. Sort by score descending
+                // 3. Create a sorted copy for biased random selection, but don't sort the main array
-                metars.sort((a, b) => b.score - a.score);
+                sortedMetars = [...metars];
+                sortedMetars.sort((a, b) => b.score - a.score);
 
                 console.log(`Loaded and ranked ${metars.length} METARs.`);
                 console.log(`Top 5 most interesting METARs:`);
-                for (let i = 0; i < Math.min(5, metars.length); i++) {
+                for (let i = 0; i < Math.min(5, sortedMetars.length); i++) {
-                    console.log(`  - Score: ${metars[i].score.toFixed(2)}, METAR: ${metars[i].metar}`);
+                    console.log(`  - Score: ${sortedMetars[i].score.toFixed(2)}, METAR: ${sortedMetars[i].metar}`);
                 }
 
                 const hash = window.location.hash.substring(1);