streamdown@2.4.0

### Minor Changes

-   5edff75: Clarified Tailwind `@source` configuration for Streamdown and optional plugins.
    Updated documentation to keep the global `@source` for core `streamdown` only, move plugin `@source` guidance to plugin docs with examples, and add a caveat to include plugin entries only if installed.

-   57cd3b5: Add support for custom starting line numbers in code blocks via the `startLine` meta option.

    Code blocks can now specify a starting line number in the meta string:

    ````md
    ```js startLine=10
    const x = 1;
    ```
    ````

    This renders line numbers beginning at 10 instead of the default 1. The feature works by parsing the `startLine=N` value from the fenced-code meta string and applying `counter-reset: line N-1` to the `<code>` element.

-   57cd3b5: Add support for customizing icons via the `icons` prop on `<Streamdown>`.

    Users can override any subset of the built-in icons (copy, download, zoom, etc.) by passing a `Partial<IconMap>`:

    ```tsx
    import { Streamdown, type IconMap } from "streamdown";

    <Streamdown icons={{ CheckIcon: MyCheckIcon }}>{content}</Streamdown>;
    ```

    Unspecified icons fall back to defaults.

-   01d27e9: Add support for custom Shiki themes via a `themes` option on `createCodePlugin`, accepting a `[light, dark]` pair of bundled theme names or full theme registration objects.

-   2cf559d: Add a virtual `inlineCode` key to the `components` prop, allowing inline code spans to be styled independently from fenced code blocks without manually detecting block vs. inline context.

-   27c7b03: Export table action components (`TableCopyDropdown`, `TableDownloadButton`, `TableDownloadDropdown`) and utilities (`extractTableDataFromElement`, `tableDataToCSV`, `tableDataToTSV`, `tableDataToMarkdown`, `escapeMarkdownTableCell`, `TableData`), enabling custom table overrides to preserve copy/download interactivity.

-   fb76275: Add a fullscreen overlay for tables with Escape/backdrop-click to close and scroll locking, controlled via `controls.table.fullscreen`. Copy and download controls remain available in the fullscreen view.

-   b392fbe: Add `literalTagContent` prop that accepts an array of custom HTML tag names (e.g. `['mention']`) whose children should be treated as plain text, escaping markdown metacharacters so user-supplied labels aren't interpreted as formatting.

-   c4c86fa: Add a `dir` prop that accepts `"ltr"`, `"rtl"`, or `"auto"`. When set to `"auto"`, each block's text direction is detected by scanning for the first strong Unicode character (Arabic, Hebrew, Thaana, etc.).

-   00872f0: Add a `prefix` prop that prepends a namespace to all generated Tailwind utility classes (e.g. `flex` becomes `tw:flex`), enabling Tailwind v4's `prefix()` feature for projects that need to avoid class name collisions.

-   401b901: Add support for custom renderers via `plugins.renderers`, allowing fenced code blocks with specific languages to be rendered by a custom component instead of the default `CodeBlock`.

### Patch Changes

-   f398611: Add `onAnimationStart` and `onAnimationEnd` callback props that fire when streaming animation begins and completes, useful for coordinating UI state with the animation lifecycle.

-   f2a7e51: Fix empty lines in syntax-highlighted code blocks collapsing into nothing by rendering a newline character for empty token rows, preserving whitespace when copying.

-   9ba8511: fix: prevent ordered list animation retrigger during streaming

    When streaming content contains multiple ordered (or unordered) lists,
    the Marked lexer merges them into a single block. As each new item appears
    the block is re-processed through the rehype pipeline, re-creating all
    `data-sd-animate` spans. This caused already-visible characters to re-run
    their CSS entry animation.

    Two changes address the root cause:

    1.  **Per-block `prevContentLength` tracking** – each `Block` component
        now keeps a `useRef` with the content length from its previous render.
        Before each render the `animatePlugin.setPrevContentLength(n)` method is
        called so the rehype plugin can detect which text-node positions were
        already rendered. Characters whose cumulative hast-text offset falls below
        the previous raw-content length receive `--sd-duration:0ms`, making them
        appear in their final state instantly rather than re-animating.

    2.  **Stable `animatePlugin` reference** – the `animatePlugin` `useMemo`
        now uses value-based dependency comparison instead of reference equality
        for the `animated` option object. This prevents the plugin from being
        recreated on every parent re-render when the user passes an inline object
        literal (e.g. `animated={{ animation: 'fadeIn' }}`). A stable reference
        is required because the rehype processor cache uses the function name as
        its key and always returns the first cached closure; only the original
        `config` object is ever read by the processor.

-   781178b: Add a granular `controls` prop that accepts a boolean to toggle all controls or an object with per-feature flags (`code`, `table`, `mermaid`) for fine-grained control over copy, download, fullscreen, and pan/zoom buttons.

-   e129f09: Add a `translations` prop for overriding all user-facing UI strings (copy/download button labels, modal text, image alt text, etc.), enabling full i18n support.

-   Updated dependencies [a725579]
    -   remend@1.2.2