streamdown@2.6.0

### Minor Changes

- 49bd143: fix(animate): serialize streaming animation across blocks

  Word stagger now runs on a shared wall-clock timeline so sibling sections no longer fade in on top of each other during streaming. Related cleanup: trailing spaces stay inside animated spans (no early link underlines), animate wrappers drop when streaming ends, already-seen text stays steady under StrictMode, and un-animated streaming is no longer deferred behind a starvable transition.

  Inspired by #493, #531, and #536.

  Fixes #482
  Fixes #535
  Fixes #550
  Fixes #570

- b734cbf: - Add custom download filenames for code, table, and mermaid via the `controls` prop
  - Configure downloads with `download: { filename: "customName" }` while keeping boolean `true`/`false` to show or hide
  - Preserve automatic file-extension mapping based on language or export format
  - Remove the `codeDownload` prop in favor of the unified `controls` API
- 5faa6fa: Add `codeBlockMaxHeight` and `tableMaxHeight` props with streaming auto-scroll
- 4436b56: - Add `controls.table.csvSeparator` (`"," | ";" | "\t" | "auto"`) for table copy and download CSV
  - Reuse `tableDataToCSV` separator handling, including locale-aware `"auto"` mode
  - Improve CSV escaping to respect the selected separator for Excel compatibility

### Patch Changes

- 6ec3c48: fix(animate): animate inline code during streaming

  Skip the animate visitor on `pre` (and svg/math/annotation) only — not bare `code`. Fenced/highlighted blocks stay un-split via their `pre` ancestor; inline backtick spans now get the same per-word fade-in as surrounding prose.

  Fixes #594

- 725e390: Forward rest props through block code. The `code` component spread its rest props on the inline branch and dropped them on the block branch, so an attribute a consumer put on a fenced code element never reached the DOM. `CodeBlockBody` now takes part in that comparison, so a forwarded attribute updates instead of keeping the value it first rendered with.
- 7e82400: Fix `dir="auto"` in static mode to detect text direction per semantic block (instead of once for the whole document), keep code LTR, and use content-majority direction for mixed-script prose.
- fb5d7b9: Serialize Mermaid SVGs before download so HTML-style tags render as valid SVG markup.
- fe38e75: Added accessibility improvements for code block controls by adding aria labels to copy/download buttons and announcing copy success state for screen readers.
- b25dbdb: fix(custom-tags): render Markdown inside custom tags with multiline content

  Adds a preprocessing step (`preprocessCustomTags`) that normalizes multiline
  custom tags into a blank-line-sandwiched HTML block so CommonMark interrupts
  the raw-HTML block and parses the nested content as Markdown, with
  `parseMarkdownIntoBlocks` re-merging the interrupted open/content/close tokens
  so streaming still treats the whole custom tag as one block. Previously, when a
  custom tag contained multiline content (e.g. `<ai-thinking>
**bold**</ai-thinking>`), CommonMark treated the block as raw HTML, stripping
  Markdown formatting. Tags listed in `literalTagContent` are excluded from
  re-parsing.

  Closes #478

- 26a8440: Fix doubled `user-content-` prefix on footnote ids

  Footnote list items were rendered with `id="user-content-user-content-fn-1"` because both `remark-rehype` and `rehype-sanitize` default their `clobberPrefix` to `user-content-`, so the prefix was applied twice. Disabled `clobberPrefix` on `rehype-sanitize` so `remark-rehype` remains the single, consistent prefixer of both footnote ids and backref hrefs — restoring working footnote navigation.

- f7d1fb5: fix(table): add `data-streamdown="table-wrapper"` to fullscreen portal so copy/download dropdowns can find the table
- f0a726b: Add `aria-hidden="true"` to decorative SVG icon components so screen readers rely on parent button labels instead of unlabeled icons.
- 2ed2faa: Allow remend's `streamdown:` incomplete-link sentinel through the default sanitize schema so streamed incomplete links render as pending instead of harden `[blocked]`.
- 8fffa9d: Render the link safety modal through a portal to `document.body` so it is no longer nested inside the paragraph's `<p>` element. This fixes the React hydration error "In HTML, `<div>` cannot be a descendant of `<p>`" that occurred when a link with link safety enabled appeared inside a paragraph.
- 2733922: fix(mermaid): add aria-hidden to decorative SVG icons in mermaid toolbar buttons

  Mermaid toolbar buttons (download, fullscreen, pan/zoom controls) already have
  accessible titles/labels, but the inline SVG icons were exposed to the accessibility
  tree causing "Content with images must be labeled" warnings. Added aria-hidden={true}
  to all decorative icon elements in download-button, fullscreen-button, and pan-zoom
  components.

  Fixes #485

- 8d36719: fix(deps): remove `mermaid` as a hard runtime dependency

  This patch replaces the type import with a local structural type for `MermaidConfig` so no type-level coupling to the `mermaid` package remains in the distributed typings. Users who want fully-typed mermaid config can still `import type { MermaidConfig } from 'mermaid'` themselves; the structural type is compatible.

  Fixes #501

- ea02609: Fix: `shikiTheme` prop priority chain is now fully reachable.

  Previously, `shikiTheme` had a default value in the props destructuring (`= defaultShikiTheme`), making the `plugins?.code?.getThemes()` fallback unreachable in both orderings. The fix removes the destructuring default and moves it to the end of the nullish coalescing chain, so all three levels are reachable:

  1. Explicit `shikiTheme` prop (highest priority)
  2. Code plugin's `getThemes()` (second priority)
  3. Built-in `defaultShikiTheme` (final fallback)

- 9813dd6: Fix type declarations requiring a `shiki` install.

  `BundledLanguage`, `BundledTheme`, and `ThemeRegistrationAny` are now defined locally and re-exported from `streamdown`, so consumers can type-check without installing `shiki`. Runtime highlighting remains in `@streamdown/code`, which still depends on `shiki`.

- d893759: Fix mermaid fullscreen overlay accessibility and add stable selector

  - Add `data-streamdown="mermaid-fullscreen"` to fullscreen overlay for stable CSS targeting
  - Update fullscreen overlay semantics to match table fullscreen behavior
  - Change `role` from `button` to `dialog`
  - Add `aria-modal="true"` for correct screen reader modal behavior
  - Improve accessibility consistency between mermaid and table fullscreen overlays

- 79c8575: fix issue with list markers, task-list checkboxes, images, and hr animations
- a1a7142: feat: add image control options (`controls.image`) to disable hover overlay and download button on images

  Add `image` to the `controls` prop, matching existing `code`, `table`, and `mermaid` patterns:

  - `controls={{ image: false }}` hides the hover overlay and download button
  - `controls={{ image: { download: false } }}` keeps the hover overlay but hides the download button

- b250038: Fix accessibility warnings for Mermaid toolbar icon buttons:

  - Add `aria-hidden="true"` to all decorative SVG icons to hide them from screen readers
  - Add `aria-label` attributes to all icon-only buttons for proper screen reader announcements
  - Add translation keys (`zoomIn`, `zoomOut`, `resetView`) for zoom controls

- 89c6877: Re-render memoized markdown components when their rendered output changes. The comparators compared source position, so a replacement of the same length — occupying the same lines and columns — was treated as unchanged and the component kept rendering the previous text.
- e7bdf57: fix(mermaid): render the download and copy controls inside the Mermaid fullscreen portal so they're reachable when the diagram is expanded
- 8f02c09: Fix table copy and download actions not working in fullscreen mode.

  - Support table lookup inside the fullscreen portal container.
  - Restore copy and download functionality for fullscreen tables.
  - Keep existing inline table controls behavior unchanged.

- f46cd3c: - Fixed table copy losing line breaks inside cells containing `<br>` elements.
  - Preserved multiline content during table data extraction.
  - Improved copied Markdown, CSV, and TSV output consistency for multiline cells.
  - Added coverage for `<br>` handling in table extraction.
- dc3f1d2: - Fix code block line wrapping when line numbers are disabled.
  - Ensure code block lines are rendered as block elements regardless of the `lineNumbers` setting.
  - Prevent multiple code lines from collapsing into a single visual line when `lineNumbers={false}`.
- Updated dependencies [a99d675]
- Updated dependencies [9f96409]
- Updated dependencies [8093f2a]
- Updated dependencies [57c3089]
  - remend@1.3.1