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/slug/frame_14.txt

@@ -0,0 +1,17 @@
+                                      
+                 tpppc                
+                 t5dd-o               
+                edee- e               
+                ee5egdxt              
+                eeeo   e              
+                xpee  pe              
+                eeee - p              
+                eeoee  o              
+                eeex   g              
+                gd55  c5              
+                oeggt-te              
+                epxeddde              
+                5ggeoooe              
+                eo5pdd5               
+                 dp po5               
+