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/css-tree/lib/generator/sourceMap.js

@@ -1,36 +1,33 @@
-var SourceMapGenerator = require('source-map/lib/source-map-generator').SourceMapGenerator;
-var trackNodes = {
-    Atrule: true,
-    Selector: true,
-    Declaration: true
-};
+import { SourceMapGenerator } from 'source-map-js/lib/source-map-generator.js';
 
-module.exports = function generateSourceMap(handlers) {
-    var map = new SourceMapGenerator();
-    var line = 1;
-    var column = 0;
-    var generated = {
+const trackNodes = new Set(['Atrule', 'Selector', 'Declaration']);
+
+export function generateSourceMap(handlers) {
+    const map = new SourceMapGenerator();
+    const generated = {
         line: 1,
         column: 0
     };
-    var original = {
+    const original = {
         line: 0, // should be zero to add first mapping
         column: 0
     };
-    var sourceMappingActive = false;
-    var activatedGenerated = {
+    const activatedGenerated = {
         line: 1,
         column: 0
     };
-    var activatedMapping = {
+    const activatedMapping = {
         generated: activatedGenerated
     };
+    let line = 1;
+    let column = 0;
+    let sourceMappingActive = false;
 
-    var handlersNode = handlers.node;
+    const origHandlersNode = handlers.node;
     handlers.node = function(node) {
-        if (node.loc && node.loc.start && trackNodes.hasOwnProperty(node.type)) {
-            var nodeLine = node.loc.start.line;
-            var nodeColumn = node.loc.start.column - 1;
+        if (node.loc && node.loc.start && trackNodes.has(node.type)) {
+            const nodeLine = node.loc.start.line;
+            const nodeColumn = node.loc.start.column - 1;
 
             if (original.line !== nodeLine ||
                 original.column !== nodeColumn) {
@@ -51,24 +48,24 @@ module.exports = function generateSourceMap(handlers) {
                 sourceMappingActive = true;
                 map.addMapping({
                     source: node.loc.source,
-                    original: original,
-                    generated: generated
+                    original,
+                    generated
                 });
             }
         }
 
-        handlersNode.call(this, node);
+        origHandlersNode.call(this, node);
 
-        if (sourceMappingActive && trackNodes.hasOwnProperty(node.type)) {
+        if (sourceMappingActive && trackNodes.has(node.type)) {
             activatedGenerated.line = line;
             activatedGenerated.column = column;
         }
     };
 
-    var handlersChunk = handlers.chunk;
-    handlers.chunk = function(chunk) {
-        for (var i = 0; i < chunk.length; i++) {
-            if (chunk.charCodeAt(i) === 10) { // \n
+    const origHandlersEmit = handlers.emit;
+    handlers.emit = function(value, type, auto) {
+        for (let i = 0; i < value.length; i++) {
+            if (value.charCodeAt(i) === 10) { // \n
                 line++;
                 column = 0;
             } else {
@@ -76,18 +73,18 @@ module.exports = function generateSourceMap(handlers) {
             }
         }
 
-        handlersChunk(chunk);
+        origHandlersEmit(value, type, auto);
     };
 
-    var handlersResult = handlers.result;
+    const origHandlersResult = handlers.result;
     handlers.result = function() {
         if (sourceMappingActive) {
             map.addMapping(activatedMapping);
         }
 
         return {
-            css: handlersResult(),
-            map: map
+            css: origHandlersResult(),
+            map
         };
     };