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_8.txt

@@ -0,0 +1,17 @@
+                                      
+             ddtdcttottd              
+           tgp5eeepoogx gt            
+         deote55pgtgx5xpotdt          
+        dpop5ette     p odeeo         
+        p 5e5toe5o      -poeet        
+       epteodddoedp      oteee        
+       epeee pdcoeee     ede5et       
+       otee5  eto5etp-    -e5ee       
+       o oeedd g5poex5tttttoxee       
+       g  op5odegteteeceoddeeop       
+        55ooeoeee5pdpdpgopg5oe        
+        ptgeoeee        -t555p        
+         podpoood    d5odet5p         
+           -cpetpgcctpc5otee          
+             xxdppoedtt5oe            
+                  ee