fix(editor): WASD/QE flycam works while hovering ImGui panels

Camera key events were gated on io.WantCaptureKeyboard, which goes
true whenever any ImGui panel has focus — not just when typing into
a text widget. Hovering the cursor over a side panel silently
disabled the flycam, which read as "WASD doesn't move the camera."

Switched the gate to io.WantTextInput, which is true only while a
text widget is actively accepting input. Now WASD/QE/Shift work
exactly when they should: always, except while you're typing into a
field.

tools/editor/editor_app.cpp

@@ -442,7 +442,11 @@ void EditorApp::processEvents() {
                     }
                 }
             }
-            if (!io.WantCaptureKeyboard)
+            // Use WantTextInput (true only while typing into a text widget)
+            // instead of WantCaptureKeyboard (true whenever any ImGui panel
+            // has focus). Otherwise hovering over a panel silently disables
+            // the WASD/QE flycam, which was the practical user complaint.
+            if (!io.WantTextInput)
                 camera_.processKeyEvent(event.key);
         }