refactor: Expose testAllMetars globally and remove dedicated button

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

metar.html

@@ -63,13 +63,11 @@
         <label style="margin-left: 1em;"><input type="checkbox" id="decode-all-checkbox"> Decode all</label>
         <div id="decoding-display"></div>
         <button id="next-btn" style="margin-top: 1em;">Next</button>
-        <button id="test-all-btn">Test All METARs</button>
     </div>
     <script>
         const metarDisplay = document.getElementById('metar-display');
         const decodingDisplay = document.getElementById('decoding-display');
         const newMetarBtn = document.getElementById('new-metar-btn');
-        const testAllBtn = document.getElementById('test-all-btn');
         const nextBtn = document.getElementById('next-btn');
         const decodeAllCheckbox = document.getElementById('decode-all-checkbox');
         const metars = [];
@@ -953,7 +951,7 @@
             }
         });
 
-        function testAllMetars() {
+        window.testAllMetars = function() {
             console.log(`--- Starting test of ${metars.length} METARs ---`);
             let failed = 0;
             let withUnknowns = 0;
@@ -1027,8 +1025,6 @@
                 }
             }
         }
-
-        testAllBtn.addEventListener('click', testAllMetars);
     </script>
 </body>
 </html>