feat: Add edit file tool (#249)

* feat: Add edit file tool
* feat: Add icons for action buttons

context/ProjectUtils.hpp

@@ -41,6 +41,17 @@ public:
      * @return true if file is part of any open project, false otherwise
      */
     static bool isFileInProject(const QString &filePath);
+
+    /**
+     * @brief Find a file in open projects by filename
+     * 
+     * Searches all open projects for a file matching the given filename.
+     * If multiple files with the same name exist, returns the first match.
+     * 
+     * @param filename File name to search for (e.g., "main.cpp")
+     * @return Absolute file path if found, empty string otherwise
+     */
+    static QString findFileInProject(const QString &filename);
 };
 
 } // namespace QodeAssist::Context