feat: Add "Decode all" checkbox for full METAR decoding

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

metar.html

@@ -42,6 +42,7 @@
         <div id="metar-display"></div>
         <button id="new-metar-btn">New METAR</button>
         <button id="test-all-btn">Test All METARs</button>
+        <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>
     </div>
@@ -51,6 +52,7 @@
         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 = [];
 
         let currentMetarSections = [];
@@ -229,10 +231,16 @@
             });
 
         newMetarBtn.addEventListener('click', displayNewMetar);
+        decodeAllCheckbox.addEventListener('change', updateDisplay);
 
         function updateDisplay() {
             if (currentMetarSections.length === 0) return;
 
+            if (decodeAllCheckbox.checked) {
+                metarDisplay.innerHTML = currentMetarSections.map(s => s.raw).join(' ');
+                decodingDisplay.textContent = currentMetarSections.map(s => s.decoded).join('\n\n');
+                nextBtn.style.display = 'none';
+            } else {
                 // Build highlighted string
                 const parts = [];
                 currentMetarSections.forEach((section, index) => {
@@ -250,6 +258,7 @@
                 // Show/hide next button
                 nextBtn.style.display = (currentSectionIndex < currentMetarSections.length - 1) ? 'inline-block' : 'none';
             }
+        }
 
         nextBtn.addEventListener('click', () => {
             if (currentSectionIndex < currentMetarSections.length - 1) {