Change animation frames (#3627)

## Description
- Changes animation frames to be smaller
- Cleans up file names and popup logic

## tests
- Passes local CI

codex-rs/tui/frames/codex/frame_12.txt

@@ -0,0 +1,17 @@
+                                      
+                ccccco                
+               odeeoxoe               
+               c  xoeco               
+               ocxxxddcx              
+              x cxxxxoox              
+              xcoocecexc              
+              x   xoexxe              
+              x   ocexxc              
+              co xoxxcxx              
+              x   oxcdce              
+              xo  xcdcco              
+               o  cx eox              
+               o ccxocex              
+               ceocoxexe              
+                e cxeoo               
+