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_15.txt

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