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/svgo/lib/util/map-nodes-to-parents.js

@@ -0,0 +1,29 @@
+import { visit } from './visit.js';
+
+/**
+ * Maps all nodes to their parent node recursively.
+ *
+ * @param {import('../types.js').XastParent} node
+ * @returns {Map<import('../types.js').XastNode, import('../types.js').XastParent>}
+ */
+export function mapNodesToParents(node) {
+  /** @type {Map<import('../types.js').XastNode, import('../types.js').XastParent>} */
+  const parents = new Map();
+
+  for (const child of node.children) {
+    parents.set(child, node);
+    visit(
+      child,
+      {
+        element: {
+          enter: (child, parent) => {
+            parents.set(child, parent);
+          },
+        },
+      },
+      node,
+    );
+  }
+
+  return parents;
+}

node_modules/svgo/lib/util/visit.js

@@ -0,0 +1,36 @@
+export const visitSkip = Symbol();
+
+/**
+ * @param {import('../types.js').XastNode} node
+ * @param {import('../types.js').Visitor} visitor
+ * @param {any=} parentNode
+ */
+export const visit = (node, visitor, parentNode) => {
+  const callbacks = visitor[node.type];
+  if (callbacks?.enter) {
+    // @ts-expect-error hard to infer
+    const symbol = callbacks.enter(node, parentNode);
+    if (symbol === visitSkip) {
+      return;
+    }
+  }
+  // visit root children
+  if (node.type === 'root') {
+    // copy children array to not lose cursor when children is spliced
+    for (const child of node.children) {
+      visit(child, visitor, node);
+    }
+  }
+  // visit element children if still attached to parent
+  if (node.type === 'element') {
+    if (parentNode.children.includes(node)) {
+      for (const child of node.children) {
+        visit(child, visitor, node);
+      }
+    }
+  }
+  if (callbacks?.exit) {
+    // @ts-expect-error hard to infer
+    callbacks.exit(node, parentNode);
+  }
+};