feat: image resizing (#5446)

Add image resizing on the client side to reduce load on the API

codex-rs/Cargo.lock

@@ -1080,6 +1080,7 @@ dependencies = [
  "eventsource-stream",
  "futures",
  "http",
+ "image",
  "indexmap 2.10.0",
  "landlock",
  "libc",
@@ -1335,6 +1336,7 @@ dependencies = [
  "anyhow",
  "base64",
  "codex-git-tooling",
+ "codex-utils-image",
  "icu_decimal",
  "icu_locale_core",
  "mcp-types",
@@ -1479,6 +1481,27 @@ dependencies = [
  "vt100",
 ]
 
+[[package]]
+name = "codex-utils-cache"
+version = "0.0.0"
+dependencies = [
+ "lru",
+ "sha1",
+ "tokio",
+]
+
+[[package]]
+name = "codex-utils-image"
+version = "0.0.0"
+dependencies = [
+ "base64",
+ "codex-utils-cache",
+ "image",
+ "tempfile",
+ "thiserror 2.0.16",
+ "tokio",
+]
+
 [[package]]
 name = "codex-utils-json-to-toml"
 version = "0.0.0"