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_5.txt

@@ -0,0 +1,17 @@
+                                      
+             aennnpnnnppa             
+         apopeoeiipinpnaiopp          
+        oaenpiooa   oanion pop        
+      pieieienp          paiiiia      
+     pneoeaapianp         a ninia     
+     iiiie nainneia          peii     
+    iei p   anainoip        ooipip    
+    ieiao    panieai          piai    
+    ipiao   eaiopionaipiaaappaoiei    
+     aninppepoo io eennapnepeieoia    
+     npiipipnnepa  oooooooopinine     
+      nnpenn a            eaeopa      
+       aeoninpa        anppoono       
+         aioipopnninappnoaino         
+            apoaooaaapappoa           
+