Fix code quality violations and exclude Manifest from checks

Document application modes (development/debug/production)
Add global file drop handler, order column normalization, SPA hash fix
Serve CDN assets via /_vendor/ URLs instead of merging into bundles
Add production minification with license preservation
Improve JSON formatting for debugging and production optimization
Add CDN asset caching with CSS URL inlining for production builds
Add three-mode system (development, debug, production)
Update Manifest CLAUDE.md to reflect helper class architecture
Refactor Manifest.php into helper classes for better organization
Pre-manifest-refactor checkpoint: Add app_mode documentation

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

node_modules/csso/lib/index.js

@@ -1,35 +1,36 @@
-var csstree = require('css-tree');
-var parse = csstree.parse;
-var compress = require('./compress');
-var generate = csstree.generate;
+import { version } from './version.js';
+import * as syntax from './syntax.js';
+import * as utils from './utils.js';
+
+const { parse, generate, compress } = syntax;
 
 function debugOutput(name, options, startTime, data) {
     if (options.debug) {
-        console.error('## ' + name + ' done in %d ms\n', Date.now() - startTime);
+        console.error(`## ${name} done in %d ms\n`, Date.now() - startTime);
     }
 
     return data;
 }
 
 function createDefaultLogger(level) {
-    var lastDebug;
+    let lastDebug;
 
     return function logger(title, ast) {
-        var line = title;
+        let line = title;
 
         if (ast) {
-            line = '[' + ((Date.now() - lastDebug) / 1000).toFixed(3) + 's] ' + line;
+            line = `[${((Date.now() - lastDebug) / 1000).toFixed(3)}s] ${line}`;
         }
 
         if (level > 1 && ast) {
-            var css = generate(ast);
+            let css = generate(ast);
 
             // when level 2, limit css to 256 symbols
             if (level === 2 && css.length > 256) {
                 css = css.substr(0, 256) + '...';
             }
 
-            line += '\n  ' + css + '\n';
+            line += `\n  ${css}\n`;
         }
 
         console.error(line);
@@ -37,18 +38,8 @@ function createDefaultLogger(level) {
     };
 }
 
-function copy(obj) {
-    var result = {};
-
-    for (var key in obj) {
-        result[key] = obj[key];
-    }
-
-    return result;
-}
-
 function buildCompressOptions(options) {
-    options = copy(options);
+    options = { ...options };
 
     if (typeof options.logger !== 'function' && options.debug) {
         options.logger = createDefaultLogger(options.debug);
@@ -62,22 +53,20 @@ function runHandler(ast, options, handlers) {
         handlers = [handlers];
     }
 
-    handlers.forEach(function(fn) {
-        fn(ast, options);
-    });
+    handlers.forEach(fn => fn(ast, options));
 }
 
 function minify(context, source, options) {
     options = options || {};
 
-    var filename = options.filename || '<unknown>';
-    var result;
+    const filename = options.filename || '<unknown>';
+    let result;
 
     // parse
-    var ast = debugOutput('parsing', options, Date.now(),
+    const ast = debugOutput('parsing', options, Date.now(),
         parse(source, {
-            context: context,
-            filename: filename,
+            context,
+            filename,
             positions: Boolean(options.sourceMap)
         })
     );
@@ -90,7 +79,7 @@ function minify(context, source, options) {
     }
 
     // compress
-    var compressResult = debugOutput('compress', options, Date.now(),
+    const compressResult = debugOutput('compress', options, Date.now(),
         compress(ast, buildCompressOptions(options))
     );
 
@@ -103,12 +92,14 @@ function minify(context, source, options) {
 
     // generate
     if (options.sourceMap) {
-        result = debugOutput('generate(sourceMap: true)', options, Date.now(), (function() {
-            var tmp = generate(compressResult.ast, { sourceMap: true });
+        result = debugOutput('generate(sourceMap: true)', options, Date.now(), (() => {
+            const tmp = generate(compressResult.ast, { sourceMap: true });
+
             tmp.map._file = filename; // since other tools can relay on file in source map transform chain
             tmp.map.setSourceContent(filename, source);
+
             return tmp;
-        }()));
+        })());
     } else {
         result = debugOutput('generate', options, Date.now(), {
             css: generate(compressResult.ast),
@@ -127,15 +118,14 @@ function minifyBlock(source, options) {
     return minify('declarationList', source, options);
 }
 
-module.exports = {
-    version: require('../package.json').version,
+export {
+    version,
+    utils,
 
     // main methods
-    minify: minifyStylesheet,
-    minifyBlock: minifyBlock,
+    minifyStylesheet as minify,
+    minifyBlock,
 
     // css syntax parser/walkers/generator/etc
-    syntax: Object.assign({
-        compress: compress
-    }, csstree)
+    syntax
 };