feat: Update padding character to Word Joiner (U+2060)

This commit updates the padding character in the `bypass_mode` feature of the `SSL_GeminiTextPrompt` node. The padding now uses the Word Joiner character (U+2060) instead of underscores.

The `_pad_text_with_underscores` method has been modified to implement this change. Text processed by this function will now have each character separated by U+2060, and the entire string will be prepended and appended with U+2060. For example, "hello" becomes "⁠h⁠e⁠l⁠l⁠o⁠".

gemini_nodes.py

@@ -94,7 +94,9 @@ class SSL_GeminiTextPrompt(ComfyNodeABC):
     def _pad_text_with_underscores(self, text: str) -> str:
         if not text:
             return ""
-        return "_" + "_".join(list(text)) + "_"
+        # Use Word Joiner (U+2060) instead of underscore
+        padding_char = "⁠"
+        return padding_char + padding_char.join(list(text)) + padding_char
 
     def save_binary_file(self, data, mime_type):
         ext = ".bin"