add pulsing dot loading state (#4736)

## Description 
Changes default CLI spinner to pulsing dot


https://github.com/user-attachments/assets/b81225d6-6655-4ead-8cb1-d6568a603d5b

## Tests
Passes CI

---------

Co-authored-by: Fouad Matin <fouad@openai.com>

codex-rs/Cargo.lock

@@ -988,7 +988,6 @@ dependencies = [
  "reqwest",
  "serde",
  "serde_json",
- "throbber-widgets-tui",
  "tokio",
  "tokio-stream",
  "tracing",
@@ -5843,16 +5842,6 @@ dependencies = [
  "cfg-if",
 ]
 
-[[package]]
-name = "throbber-widgets-tui"
-version = "0.8.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "1d36b5738d666a2b4c91b7c24998a8588db724b3107258343ebf8824bf55b06d"
-dependencies = [
- "rand 0.8.5",
- "ratatui",
-]
-
 [[package]]
 name = "tiff"
 version = "0.10.3"