Profiler exports should use Studio’s friendly method names

Studio's profiler panel shows friendly method names — the profile startup row is labelled Project startup instead of <script>, and compiler-generated event-handler prefixes such as $handler_ are hidden (for example App.$handler_Run is shown as App.Run).

The exported profile files do not follow the same convention. Export CSV and Export JSON write the raw internal names (<script>, App.$handler_Run) instead of the friendly names the panel displays, so exported reports are harder to read and inconsistent with what the user sees in the UI.

Expected behaviour: CSV and JSON exports should use the same friendly method names shown in Studio's profiler panel, while keeping stable IDs and all timing/call-tree data intact.