feat(apollo-wind): close the chat primitive gaps found by the Wind chat

[BenGSchulz]

Summary

MST-16880, part of the Wind chat epic MST-16172. Stacked on #1400 (math fences); the next PR adds compact density.

The Wind chat renderers (R-3 to R-8) worked around gaps in apollo-wind primitives. This adds the smallest options that let them drop those workarounds, plus the overlay animations that generated no CSS.

Ticket correction: KaTeX strict

The ticket says input Material rejects renders in Wind because Material uses strict: true. It does not: Material also renders math through rehype-katex, and when a formula fails strict mode rehype-katex renders it again with strict: 'ignore'. strict: true and 'ignore' produce identical HTML (checked). Material's direct katex.renderToString path in code.tsx never runs for math fences, because rehype-katex replaces them first. katexOptions.strict is still exposed, documented as reporting only.

Changes per item

Item	Change	Decision
CodeBlock	body replaces the highlighted source; header, actions and copy stay. false, null, undefined keep the source.
Markdown	renderCodeBlock(block, props) renders each fenced block with the props Markdown would pass CodeBlock, so a host component can keep per-block state (a preview toggle).	Needed because actions and body share state per block. renderCodeActions stays.
Markdown	katexOptions: { strict, macros }. Output stays MathML and trust stays off, applied after the options. Each render gets its own copy of macros.	KaTeX writes \gdef into the object it is given: a shared one would let one message redefine a host macro for later messages, and a frozen one would throw.
Markdown	Display math gets overflow-y-hidden next to its horizontal scroll.	Fixes a pre-existing axe scrollable-region-focusable (1 to 2px of vertical overflow) on main's Math story and #1400's MathFences story.
Dialog	DialogStrings / DEFAULT_DIALOG_STRINGS: close, closeTakeover, expand, collapse.	Defaults unchanged.
Sheet	SheetStrings / DEFAULT_SHEET_STRINGS: close.
DisclosureTree	New read-only ARIA tree: no toolbar, defaultExpanded or controlled expanded / onExpandedChange, lazy children (built once per item object), leading icon, trailing info, description as tooltip and accessible description, roving tabindex with Up/Down, Home/End, Right/Left, Enter/Space. Each treeitem contains its group and is named by its label. Rows share ToolCall's row style through an internal module.	A sibling rather than options on TreeView: TreeView is a file manager (search, drag selection, context menus, a HoverCard per row, inline English copy, every row tabbable), and switching that off would still not give it tree keyboard navigation.
DropzoneOverlay	typesHint, sizeHint, countHint strings, shown under the hint when not empty.	The host formats them, since they carry values.
DropzoneOverlay	A paste with files is kept from the field unless nothing was accepted and it carries text.	Text pasted along with a refused file now lands.
AttachmentTitle	Tooltip with the full name while the title is cut off, measured on every open. Opt out with truncationTooltip={false}.	On by default, so composer chips get it too. Radix has no way to detect a provider above, so each title has its own TooltipProvider (a context, no DOM).
Search	SearchStrings / DEFAULT_SEARCH_STRINGS with clear; SearchWithSuggestions passes strings through.
EmptyState	size="compact" for panels: smaller type and spacing, sm buttons, no heading element.	A heading inside a panel would add a stray entry to the page outline.
Animations	animate-in / animate-out with fade-*, zoom-* and slide-* modifiers (numbers, fractions, bare, arbitrary values) in tailwind.utilities.css, plus an unlayered reduced-motion rule.	Own CSS instead of tw-animate-css (MIT, CSS only): it redefines delay-* for every consumer, its collapsible keyframes clash with ours, and it has no reduced-motion handling. The unlayered rule also wins over tw-animate-css if a host loads it.

Host-visible changes and release notes

• Overlays now animate. Popover, Dialog, AlertDialog, Tooltip, HoverCard, Sheet, DropdownMenu, ContextMenu, Select and the DropzoneOverlay used animation classes that generated no CSS. They now fade, zoom and slide (150ms by default, Dialog 200ms, Sheet 300 to 500ms), and not at all under prefers-reduced-motion. Radix Presence keeps a closing overlay mounted until its exit animation ends, so downstream e2e tests that assert immediate removal may need to wait. Consumers of dist/styles.css and of @uipath/apollo-wind/tailwind.css (as apollo-react's tailwind.chat.css and tailwind.canvas.css import it) both get the utilities; checked by compiling a sheet of that shape.
• Strings types. DropzoneOverlayStrings gains required typesHint, sizeHint and countHint. A host that builds the full object (not a Partial) gets a type error until it adds them.
• Paste. DropzoneOverlay with enablePaste no longer blocks text pasted along with refused files.
• DisclosureTree markup. New component, no change to TreeView.
• AttachmentTitle. The title span carries a Radix tooltip trigger (data-state) by default.

What the Wind chat can drop in its follow-up

• CodeBlockActions opening the HTML preview in a Dialog: an inline code and preview toggle through renderCodeBlock and body, as Material does.
• The custom Dialog close button (showCloseButton={false} plus its own close): DialogContent strings.
• Its own DisclosureTree and openState: apollo-wind DisclosureTree with expanded / onExpandedChange for the tree message and the Traces section.
• The single-string drop hint: typesHint, sizeHint, countHint.
• titleTruncatedChip (native title on pointer over): the built-in tooltip.
• showClearButton={false} on the history Search: strings.clear.
• EmptyMessage in the history panel: EmptyState size="compact".
• Its own paste handler in WindChatDropzone, if enablePaste with the remaining count covers it.
• Nothing for strict: Wind already matches Material.

Out of scope, noted

• A disabled DropzoneOverlay still lets a dropped file open in the tab; the chat keeps its panel-scoped guard.
• MarkdownCodeBlock has no per-block streaming flag; the host passes its message-level flag.
• An AttachmentGroup that overflows with chips that have no buttons (the chat's message attachments) is a scroll region keyboard users cannot reach.
• Prism token colours fail axe colour contrast on a few tokens in light mode (existing, e.g. CodeBlock Languages).

Tests

• Unit tests for every option: CodeBlock body (including false and null), renderCodeBlock props, KaTeX macros (passed through, host object unchanged after \gdef, frozen object still renders) and trust staying off, display math overflow classes, Dialog, Sheet and Search strings, SearchWithSuggestions strings, DropzoneOverlay limit lines and paste (accepted with text, refused with text, image only), AttachmentTitle tooltip (cut off, fits, re-measured, axe with the tooltip open), EmptyState compact (with axe), DisclosureTree (structure, ownership, naming, click, controlled, lazy, keyboard including Right on an open row with no children, zero-valued slots, description, axe).
• tailwind.animations.test.ts compiles the utilities with Tailwind: keyframes, the unlayered reduced-motion rule, and ten value forms.
• Storybook: every new story checked with axe in the browser (clean apart from the Prism contrast note above). Popover and Dialog checked opening with apollo-enter and closing with apollo-exit. The HTML preview stories use sandbox="allow-scripts" with a no-referrer and CSP prefix, shared from .storybook/html-preview.ts.
• Biome on touched files, tsc --noEmit, the full apollo-wind suite and pnpm --filter @uipath/apollo-wind build.

🤖 Generated with Claude Code

[github-actions]

Dependency License Review

• ✅ 1947 package(s) scanned
• ✅ No license issues found
• ⚠️ 2 package(s) excluded (see details below)

License distribution

License	Packages
MIT	1713
ISC	91
Apache-2.0	56
BSD-3-Clause	28
BSD-2-Clause	23
BlueOak-1.0.0	8
MPL-2.0	4
MIT-0	3
CC0-1.0	3
MIT OR Apache-2.0	2
(MIT OR Apache-2.0)	2
Unlicense	2
LGPL-3.0-or-later	1
Python-2.0	1
CC-BY-4.0	1
(MPL-2.0 OR Apache-2.0)	1
Unknown	1
Artistic-2.0	1
(WTFPL OR MIT)	1
(BSD-2-Clause OR MIT OR Apache-2.0)	1
CC-BY-3.0	1
0BSD	1
(MIT OR CC0-1.0)	1
MIT AND ISC	1

Excluded packages

Package	Version	License	Reason
@img/sharp-libvips-linux-x64	1.3.4	LGPL-3.0-or-later	LGPL pre-built binary, not linked
khroma	2.1.0	Unknown	MIT per GitHub repo, missing license field in package.json