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_36.txt

@@ -0,0 +1,17 @@
+                                      
+              ddtottttottd            
+          doggot5c5totcttgpptd        
+        topottp-pgee egpxptetpet      
+      degptdddd            ppxoge     
+     t5dcopeoeot-             do-p    
+     5 t5e  pd ge5t            godp   
+    e cge     go goo            edet  
+    eeox      do d55g           oe e  
+    epge     55 tpgptttdtttttd  eoxe  
+     dpeo  tedd5x5 gexdddddddee o5pe  
+     p peo tdt5d     gppdddddg etg5   
+      ptgoc-                 t5eg5    
+        o5eetxt           tttg5te     
+          ptdgppodcxdtxcg-gtctp       
+            ept5xdttdttttppg          
+