refactor: migrate to modular tool-based architecture

- Implement tool registry system with individual tool modules
- Reorganize transformers into categorized source modules
- Remove emojiLibrary.js, consolidate into EmojiUtils and emojiData
- Fix mobile close button and tooltip functionality
- Add build system for transforms and emoji data
- Migrate from Python backend to pure JavaScript
- Add comprehensive documentation and testing
- Improve code organization and maintainability
- Ignore generated files (transforms-bundle.js, emojiData.js)

src/transformers/unicode/cursive.js

@@ -0,0 +1,23 @@
+// cursive transform
+import BaseTransformer from '../BaseTransformer.js';
+
+export default new BaseTransformer({
+    name: 'Cursive',
+    priority: 85,
+    map: {
+        'a': '𝓪', 'b': '𝓫', 'c': '𝓬', 'd': '𝓭', 'e': '𝓮', 'f': '𝓯', 'g': '𝓰', 'h': '𝓱', 'i': '𝓲',
+        'j': '𝓳', 'k': '𝓴', 'l': '𝓵', 'm': '𝓶', 'n': '𝓷', 'o': '𝓸', 'p': '𝓹', 'q': '𝓺', 'r': '𝓻',
+        's': '𝓼', 't': '𝓽', 'u': '𝓾', 'v': '𝓿', 'w': '𝔀', 'x': '𝔁', 'y': '𝔂', 'z': '𝔃',
+        'A': '𝓐', 'B': '𝓑', 'C': '𝓒', 'D': '𝓓', 'E': '𝓔', 'F': '𝓕', 'G': '𝓖', 'H': '𝓗', 'I': '𝓘',
+        'J': '𝓙', 'K': '𝓚', 'L': '𝓛', 'M': '𝓜', 'N': '𝓝', 'O': '𝓞', 'P': '𝓟', 'Q': '𝓠', 'R': '𝓡',
+        'S': '𝓢', 'T': '𝓣', 'U': '𝓤', 'V': '𝓥', 'W': '𝓦', 'X': '𝓧', 'Y': '𝓨', 'Z': '𝓩'
+    },
+    func: function(text) {
+        return [...text].map(c => this.map[c] || c).join('');
+    },
+    // Detector: Check for cursive/bold cursive Unicode characters
+    detector: function(text) {
+        // Bold cursive mathematical characters (check for presence)
+        return /[𝓪𝓫𝓬𝓭𝓮𝓯𝓰𝓱𝓲𝓳𝓴𝓵𝓶𝓷𝓸𝓹𝓺𝓻𝓼𝓽𝓾𝓿𝔀𝔁𝔂𝔃𝓐𝓑𝓒𝓓𝓔𝓕𝓖𝓗𝓘𝓙𝓚𝓛𝓜𝓝𝓞𝓟𝓠𝓡𝓢𝓣𝓤𝓥𝓦𝓧𝓨𝓩]/u.test(text);
+    }
+});