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/dots/frame_21.txt

@@ -0,0 +1,17 @@
+                                      
+             ○○●○●○○●○●●○○            
+          ●●●··○○●·○·●◉○·◉●●○         
+        ◉●○○●●○ ·     ·○·●●○·●●       
+      ●●·◉ ●             ○●◉●●◉●●     
+     ◉●◉●·             ●·◉○○ ○○○○●    
+    ◉ ◉·             ●●●○◉◉    ○○○●   
+    ·●··           ○ ◉·●◉●     ○◉○    
+     ·○            ○◉  ·●       · ·   
+    · ·  ●●◉◉◉◉◉●●●  ○·● ·●    ◉◉ ·   
+    · ·○ ·○      ○●·   ○ ·●·●  ◉ ◉◉   
+     ◉  ◉ ··     ●·     ●●○●◉ ◉· ●    
+     ●● ◉◉○                 ○●  ◉     
+       ●○  ○◉○          ○◉◉●● ●·      
+         ●○○ ● ●●◉··◉◉○●    ◉·        
+            ●●●◉●○○○○●○◉●●·           
+