chore(client): add missing .uid and .import files from Godot 4.6

Generated by headless --import after audio merge. These are needed
for stable UID references across editor sessions.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

client/scripts/rendering/cursor_renderer.gd.uid

@@ -0,0 +1 @@
+uid://bkbfcalfo1kk8

client/scripts/rendering/fog_entities.gd.uid

@@ -0,0 +1 @@
+uid://cw154tgjdyhe1

client/scripts/rendering/fog_shader.gd.uid

@@ -0,0 +1 @@
+uid://dje4vilxh5xxu