Add file icon for the Odin programming language (#43855)

Release Notes:

- Added file icon for the [Odin programming
language](https://odin-lang.org/).

<img width="617" height="288" alt="CleanShot 2025-11-30 at 22 37 00"
src="https://github.com/user-attachments/assets/2389b90a-2fec-43bf-838f-1441f08b724a"
/>

crates/theme/src/icon_theme.rs

@@ -167,6 +167,7 @@ const FILE_SUFFIXES_BY_ICON_KEY: &[(&str, &[&str])] = &[
     ("nim", &["nim"]),
     ("nix", &["nix"]),
     ("ocaml", &["ml", "mli"]),
+    ("odin", &["odin"]),
     ("php", &["php"]),
     (
         "prettier",
@@ -332,6 +333,7 @@ const FILE_ICONS: &[(&str, &str)] = &[
     ("nim", "icons/file_icons/nim.svg"),
     ("nix", "icons/file_icons/nix.svg"),
     ("ocaml", "icons/file_icons/ocaml.svg"),
+    ("odin", "icons/file_icons/odin.svg"),
     ("phoenix", "icons/file_icons/phoenix.svg"),
     ("php", "icons/file_icons/php.svg"),
     ("prettier", "icons/file_icons/prettier.svg"),