polish(clients/windows): name the session exe "Punktfunk Session" in its version info

UAC prompts, Task Manager and Properties→Details show FileDescription; without one the exe
appeared as its raw filename.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

clients/session/build.rs

@@ -13,6 +13,11 @@ fn main() {
         winresource::WindowsResource::new()
             // Ordinal 1 — pf-presenter's win32.rs loads it by this id for WM_SETICON.
             .set_icon_with_id(icon, "1")
+            // The version-info strings Windows surfaces for the bare exe — UAC prompts,
+            // Task Manager and Properties→Details all show FileDescription (without one
+            // the exe appears as its raw filename).
+            .set("FileDescription", "Punktfunk Session")
+            .set("ProductName", "Punktfunk")
             .compile()
             .expect("embed windows icon resource");
     }