Add new formula operator AI extraction, as well as showing tabs in the formula reference to compare versions.

Author: rcfox

public/formulas.css

@@ -63,6 +63,64 @@
     background: var(--surface-color);
 }
 
+/* Version tabs (current vs previous game version) */
+.version-tabs {
+    display: flex;
+    gap: 2px;
+    flex: 1;
+    align-items: flex-end;
+    border-bottom: 1px solid var(--border-color);
+}
+
+.version-tabs-spacer {
+    flex: 1;
+}
+
+.version-tab {
+    background: transparent;
+    border: 1px solid transparent;
+    border-bottom: none;
+    border-radius: 4px 4px 0 0;
+    padding: 6px 12px;
+    font-size: 13px;
+    font-weight: 500;
+    color: var(--text-muted);
+    cursor: pointer;
+    transition: all 0.15s;
+    margin-bottom: -1px;
+}
+
+.version-tab:hover {
+    color: var(--text-color);
+    background: var(--code-bg);
+}
+
+.version-tab.active {
+    color: var(--primary-color);
+    background: var(--surface-color);
+    border-color: var(--border-color);
+    border-bottom-color: var(--surface-color);
+    font-weight: 600;
+}
+
+.version-content {
+    display: none;
+}
+
+.version-content.active {
+    display: block;
+}
+
+.prev-signature {
+    margin-bottom: 10px;
+}
+
+.version-use-separator {
+    border: none;
+    border-top: 1px dashed var(--border-color);
+    margin: 16px 0;
+}
+
 @media (max-width: 768px) {
     .operator-metadata {
         grid-template-columns: 1fr;

src/formula-metadata.ts

@@ -20,7 +20,6 @@ export interface FormulaUse {
 
 export interface FormulaOperator {
   name: string;
-  category: string;
   isFunctionStyle: boolean;
   alternateDelimiters?: string[];
   delegatesTo?: string; // For operators like mIs0, mMin0 that validate functionName against m: sub-operators
@@ -137,22 +136,6 @@ export function getAllOperatorNames(): string[] {
   return data.operators.map(op => op.name);
 }
 
-/**
- * Get operator categories
- */
-export function getOperatorsByCategory(): Map<string, string[]> {
-  const categoryMap = new Map<string, string[]>();
-
-  for (const op of data.operators) {
-    if (!categoryMap.has(op.category)) {
-      categoryMap.set(op.category, []);
-    }
-    categoryMap.get(op.category)!.push(op.name);
-  }
-
-  return categoryMap;
-}
-
 /**
  * Get alternate delimiters for an operator (e.g., [","] for gIs)
  * Accepts both operator names and aliases