feat: Add 'Test All METARs' button to decode all loaded METARs

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

metar.html

@@ -32,10 +32,12 @@
 
         <div id="metar-display"></div>
         <button id="new-metar-btn">New METAR</button>
+        <button id="test-all-btn">Test All METARs</button>
     </div>
     <script>
         const metarDisplay = document.getElementById('metar-display');
         const newMetarBtn = document.getElementById('new-metar-btn');
+        const testAllBtn = document.getElementById('test-all-btn');
         const metars = [];
 
         function parseMetar(metarString) {
@@ -137,6 +139,16 @@
             });
 
         newMetarBtn.addEventListener('click', displayNewMetar);
+
+        function testAllMetars() {
+            console.log(`--- Starting test of ${metars.length} METARs ---`);
+            metars.forEach(metarString => {
+                parseMetar(metarString);
+            });
+            console.log(`--- Test finished ---`);
+        }
+
+        testAllBtn.addEventListener('click', testAllMetars);
     </script>
 </body>
 </html>