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_14.txt

@@ -0,0 +1,17 @@
+                                      
+                 ccccd                
+                 ooeeoe               
+                xexxo x               
+                xxoxcexo              
+                xxxe   x              
+                xcxx  cx              
+                xxxx o c              
+                xxexe  e              
+                xxxx   c              
+                ceoo  do              
+                exccooox              
+                xcxxeeex              
+                o cxddde              
+                xeoceeo               
+                 ec cdo               
+