feat: Move 'Test All METARs' button to bottom left (desktop only)

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

metar.html

@@ -15,10 +15,19 @@
             min-height: 3em;
         }
 
+        #test-all-btn {
+            position: fixed;
+            bottom: 2em;
+            left: 2em;
+        }
+
         @media (max-width: 600px) {
             #metar-display {
                 min-height: 6em;
             }
+            #test-all-btn {
+                display: none;
+            }
         }
         button {
             font-size: 1em;
@@ -41,10 +50,10 @@
 
         <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>
+        <button id="test-all-btn">Test All METARs</button>
     </div>
     <script>
         const metarDisplay = document.getElementById('metar-display');