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/cjs/restructure/prepare/specificity.cjs

@@ -0,0 +1,133 @@
+'use strict';
+
+const cssTree = require('css-tree');
+
+function ensureSelectorList(node) {
+    if (node.type === 'Raw') {
+        return cssTree.parse(node.value, { context: 'selectorList' });
+    }
+
+    return node;
+}
+
+function maxSpecificity(a, b) {
+    for (let i = 0; i < 3; i++) {
+        if (a[i] !== b[i]) {
+            return a[i] > b[i] ? a : b;
+        }
+    }
+
+    return a;
+}
+
+function maxSelectorListSpecificity(selectorList) {
+    return ensureSelectorList(selectorList).children.reduce(
+        (result, node) => maxSpecificity(specificity(node), result),
+        [0, 0, 0]
+    );
+}
+
+// §16. Calculating a selector’s specificity
+// https://www.w3.org/TR/selectors-4/#specificity-rules
+function specificity(simpleSelector) {
+    let A = 0;
+    let B = 0;
+    let C = 0;
+
+    // A selector’s specificity is calculated for a given element as follows:
+    simpleSelector.children.forEach((node) => {
+        switch (node.type) {
+            // count the number of ID selectors in the selector (= A)
+            case 'IdSelector':
+                A++;
+                break;
+
+            // count the number of class selectors, attributes selectors, ...
+            case 'ClassSelector':
+            case 'AttributeSelector':
+                B++;
+                break;
+
+            // ... and pseudo-classes in the selector (= B)
+            case 'PseudoClassSelector':
+                switch (node.name.toLowerCase()) {
+                    // The specificity of an :is(), :not(), or :has() pseudo-class is replaced
+                    // by the specificity of the most specific complex selector in its selector list argument.
+                    case 'not':
+                    case 'has':
+                    case 'is':
+                    // :matches() is used before it was renamed to :is()
+                    // https://github.com/w3c/csswg-drafts/issues/3258
+                    case 'matches':
+                    // Older browsers support :is() functionality as prefixed pseudo-class :any()
+                    // https://developer.mozilla.org/en-US/docs/Web/CSS/:is
+                    case '-webkit-any':
+                    case '-moz-any': {
+                        const [a, b, c] = maxSelectorListSpecificity(node.children.first);
+
+                        A += a;
+                        B += b;
+                        C += c;
+
+                        break;
+                    }
+
+                    // Analogously, the specificity of an :nth-child() or :nth-last-child() selector
+                    // is the specificity of the pseudo class itself (counting as one pseudo-class selector)
+                    // plus the specificity of the most specific complex selector in its selector list argument (if any).
+                    case 'nth-child':
+                    case 'nth-last-child': {
+                        const arg = node.children.first;
+
+                        if (arg.type === 'Nth' && arg.selector) {
+                            const [a, b, c] = maxSelectorListSpecificity(arg.selector);
+
+                            A += a;
+                            B += b + 1;
+                            C += c;
+                        } else {
+                            B++;
+                        }
+
+                        break;
+                    }
+
+                    // The specificity of a :where() pseudo-class is replaced by zero.
+                    case 'where':
+                        break;
+
+                    // The four Level 2 pseudo-elements (::before, ::after, ::first-line, and ::first-letter) may,
+                    // for legacy reasons, be represented using the <pseudo-class-selector> grammar,
+                    // with only a single ":" character at their start.
+                    // https://www.w3.org/TR/selectors-4/#single-colon-pseudos
+                    case 'before':
+                    case 'after':
+                    case 'first-line':
+                    case 'first-letter':
+                        C++;
+                        break;
+
+                    default:
+                        B++;
+                }
+                break;
+
+            // count the number of type selectors ...
+            case 'TypeSelector':
+                // ignore the universal selector
+                if (!node.name.endsWith('*')) {
+                    C++;
+                }
+                break;
+
+            // ... and pseudo-elements in the selector (= C)
+            case 'PseudoElementSelector':
+                C++;
+                break;
+        }
+    });
+
+    return [A, B, C];
+}
+
+module.exports = specificity;