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/syntax/node/IdSelector.js

@@ -1,27 +1,26 @@
-var TYPE = require('../../tokenizer').TYPE;
+import { Hash, Delim } from '../../tokenizer/index.js';
 
-var HASH = TYPE.Hash;
-
-// <hash-token>
-module.exports = {
-    name: 'IdSelector',
-    structure: {
-        name: String
-    },
-    parse: function() {
-        var start = this.scanner.tokenStart;
-
-        // TODO: check value is an ident
-        this.eat(HASH);
-
-        return {
-            type: 'IdSelector',
-            loc: this.getLocation(start, this.scanner.tokenStart),
-            name: this.scanner.substrToCursor(start + 1)
-        };
-    },
-    generate: function(node) {
-        this.chunk('#');
-        this.chunk(node.name);
-    }
+export const name = 'IdSelector';
+export const structure = {
+    name: String
 };
+
+export function parse() {
+    const start = this.tokenStart;
+
+    // TODO: check value is an ident
+    this.eat(Hash);
+
+    return {
+        type: 'IdSelector',
+        loc: this.getLocation(start, this.tokenStart),
+        name: this.substrToCursor(start + 1)
+    };
+}
+
+export function generate(node) {
+    // Using Delim instead of Hash is a hack to avoid for a whitespace between ident and id-selector
+    // in safe mode (e.g. "a#id"), because IE11 doesn't allow a sequence <ident-token> <hash-token>
+    // without a whitespace in values (e.g. "1px solid#000")
+    this.token(Delim, '#' + node.name);
+}