docs: clarify type-aware detection covers DOM APIs

The existing string literal union detection already covers:
- HTMLElementTagNameMap (createElement)
- GlobalEventHandlersEventMap (addEventListener)
- RequestMode, RequestCredentials, ScrollBehavior, etc.

Author: swernerx

README.md

@@ -68,7 +68,7 @@ Or configure rules manually:
 
 | Rule | Description | Recommended |
 |------|-------------|:-----------:|
-| [no-unlocalized-strings](docs/rules/no-unlocalized-strings.md) | Detects user-visible strings not wrapped in Lingui macros. Uses TypeScript types to automatically ignore technical strings like union types and Intl API arguments. | ✅ |
+| [no-unlocalized-strings](docs/rules/no-unlocalized-strings.md) | Detects user-visible strings not wrapped in Lingui macros. Uses TypeScript types to automatically ignore technical strings like string literal unions, DOM APIs, Intl methods, and discriminated union fields. | ✅ |
 | [no-single-variable-message](docs/rules/no-single-variable-message.md) | Disallows messages that consist only of a single variable without surrounding text. Such messages provide no context for translators. | ✅ |
 | [no-single-tag-message](docs/rules/no-single-tag-message.md) | Disallows `<Trans>` components that contain only a single JSX element without text. The wrapped element should be translated directly instead. | ✅ |
 | [no-nested-macros](docs/rules/no-nested-macros.md) | Prevents nesting Lingui macros inside each other (e.g., `t` inside `<Trans>`). Nested macros create invalid message catalogs and confuse translators. | ✅ |

docs/rules/no-unlocalized-strings.md

@@ -77,6 +77,16 @@ function setAlign(align: "left" | "center" | "right") {}
 setAlign("center")  // ✅ Not reported
 ```
 
+### DOM APIs
+
+```tsx
+// All DOM string literal unions are automatically detected
+document.createElement("div")                          // ✅ keyof HTMLElementTagNameMap
+element.addEventListener("click", handler)             // ✅ keyof GlobalEventHandlersEventMap
+fetch(url, { mode: "cors", credentials: "include" })   // ✅ RequestMode, RequestCredentials
+element.scrollIntoView({ behavior: "smooth" })         // ✅ ScrollBehavior
+```
+
 ### Intl-Related Types
 
 ```tsx