feat(cli): implement automatic theme switching based on terminal background (#17976)

Co-authored-by: Jacob Richman <jacob314@gmail.com>

docs/get-started/configuration.md

@@ -170,6 +170,15 @@ their corresponding top-level category object in your `settings.json` file.
     available options.
   - **Default:** `undefined`
 
+- **`ui.autoThemeSwitching`** (boolean):
+  - **Description:** Automatically switch between default light and dark themes
+    based on terminal background color.
+  - **Default:** `true`
+
+- **`ui.terminalBackgroundPollingInterval`** (number):
+  - **Description:** Interval in seconds to poll the terminal background color.
+  - **Default:** `60`
+
 - **`ui.customThemes`** (object):
   - **Description:** Custom theme definitions.
   - **Default:** `{}`