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_29.txt

@@ -0,0 +1,17 @@
+                                      
+                 poooop               
+                pioe on               
+                apii ooi              
+                iiiianpe              
+                n ioi  i              
+                ipiii aa              
+                inniii a              
+                iinii                 
+                iiioi   a             
+                ainii   a             
+                oiieia n              
+                ieiii ai              
+                iiiiaiai              
+                inioeoio              
+                 iio ep               
+