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/openai/frame_14.txt

@@ -0,0 +1,17 @@
+                                      
+                 pooon                
+                 peaaen               
+                iaiie i               
+                iieioaip              
+                iiin   i              
+                ioii  oi              
+                iiii e o              
+                iinia  n              
+                iiii   o              
+                oaee  ne              
+                nioopepi              
+                ioiiaaai              
+                e oinnna              
+                ineoaae               
+                 ao one               
+