Fix 11ty build error - ignore mobile.html template processing

Issue: 11ty was trying to process mobile.html as Liquid template,
failing on React JSX syntax.

Fix: Added eleventyConfig.ignores to skip template processing,
still copies file via passthrough.

This allows the HTML/React file to deploy without build errors.

.eleventy.js

@@ -7,7 +7,11 @@ module.exports = function(eleventyConfig) {
   // Decap CMS admin panel
   eleventyConfig.addPassthroughCopy("admin");
   
-  // Mobile task manager
+  // Mobile task manager - IGNORE, don't process as template
+  eleventyConfig.ignores.add("admin/mobile.html");
+  eleventyConfig.addPassthroughCopy("admin/mobile.html");
+  
+  // Tasks folder
   eleventyConfig.addPassthroughCopy("tasks");
 
   return {